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FastTool bundles practical online tools for developers, writers, marketers, and everyday operations. Open a tool, finish the task in your browser, and move on without accounts, installs, or clutter.

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Total tools 413
Categories 17
Top category Developer

Stopwatch

Productivity

Precise online stopwatch with lap tracking and millisecond accuracy.

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CSS Grid Generator

Developer

Build CSS Grid layouts visually — set columns, rows, gap, and column width template, then copy the ready CSS.

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Fancy Text Generator

Writing

Convert plain text into 20+ fancy Unicode styles — bold, italic, script, gothic, bubble, and more. Copy and paste anywhere.

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Font Style Generator

Design

Convert plain text into 10 fancy Unicode font styles — bold, italic, script, fraktur, double-struck and more for social media bios.

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URL Parser

Developer

Parse URLs into components like protocol, host, path, and query parameters.

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cURL to Code

Developer

Convert a cURL command into JavaScript fetch, Python requests, or PHP code instantly.

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Crypto Converter

Finance

Convert between Bitcoin, Ethereum, and other top cryptocurrencies with live USD, EUR, and GBP rates.

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Meeting Time Planner

Productivity

Find the perfect meeting time across multiple cities and time zones — see local times for everyone at once.

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Math Quiz Generator

Education

Practice math with randomly generated quizzes — choose addition, subtraction, multiplication, or division at any difficulty.

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Regex Cheat Sheet

Developer

Interactive regex quick-reference with live test area — learn and test common patterns instantly.

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Number to Words

Math

Convert any number up to 999 trillion into English words — perfect for checks, invoices, and legal documents.

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JSON to TypeScript

Developer

Generate TypeScript interfaces from JSON — paste your JSON and get a clean, typed interface instantly.

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Periodic Table

Education

Interactive periodic table — search all 118 elements by name or symbol and view atomic details.

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HTML Minifier

Developer

Minify HTML by removing comments and collapsing whitespace — see byte savings instantly in the browser.

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Anagram Solver

Writing

Check if two words are anagrams and analyze letter frequency — great for Scrabble, word games, and puzzles.

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Color Name Finder

Design

Find the nearest CSS named color for any hex or RGB value — see the top 5 closest matches with distance scores.

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Time Duration Calculator

Productivity

Calculate the exact duration between two date-times — results in years, months, weeks, days, hours, minutes, and seconds.

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Color Mixer

Design

Mix two colors together at any ratio — see the blended result as hex, RGB, and a live preview swatch.

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ATS Resume Checker

Writing

Check your resume against a job description — see keyword matches, missing keywords, and ATS compatibility score.

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HTML to JSX Converter

Developer

Convert HTML code to JSX/React syntax — transforms class to className, style strings to objects, and self-closes tags.

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JWT Debugger

Developer

Decode and inspect JWT tokens — view header, payload, expiration status, and claims without a secret key.

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XML Sitemap Generator

SEO

Generate a valid XML sitemap from a list of URLs — set priority, change frequency, and last modified date for each URL.

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Redirect Checker

SEO

Analyze URL redirect chains — enter URLs and simulate redirect paths with status codes for SEO auditing.

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Email Signature Generator

Productivity

Create professional HTML email signatures with your name, title, company, phone, and social links — copy the HTML to use anywhere.

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Reading Time Estimator

Writing

Estimate reading time for any text — paste content and get reading time at different speeds with word and character counts.

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Pace Calculator

Health

Calculate running or walking pace, finish time, or distance — essential tool for runners, cyclists, and fitness enthusiasts.

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Prime Number Checker

Math

Check if a number is prime, find all primes in a range, and get prime factorization — useful for math and education.

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Budget Planner

Finance

Plan your monthly budget with income and expense categories — see totals, savings rate, and a spending breakdown instantly.

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ROI Calculator

Finance

Calculate return on investment (ROI) — enter cost and gain to get ROI percentage, net profit, and annualized return.

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Break-Even Calculator

Finance

Find your break-even point — enter fixed costs, variable cost per unit, and selling price to see units needed and revenue required.

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Time Card Calculator

Productivity

Calculate total work hours for a week — enter daily clock-in and clock-out times to get total hours worked and weekly pay.

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Ideal Weight Calculator

Health

Calculate your ideal body weight based on height and gender using multiple medical formulas — Hamwi, Devine, Robinson, and Miller.

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LinkedIn Post Generator

Marketing

Generate engaging LinkedIn posts for any topic — choose tone, add emoji, and get formatted posts ready to copy and share.

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Auto Loan Calculator

Finance

Calculate your monthly car payment, total interest, and loan cost — enter vehicle price, down payment, rate, and term.

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Citation Generator

Education

Generate properly formatted citations in APA, MLA, and Chicago styles — for books, websites, and journal articles.

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Biorhythm Calculator

Lifestyle

Calculate your physical, emotional, and intellectual biorhythm cycles based on your birth date — see your peak and low days at a glance.

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Fake Data Generator

Developer

Generate realistic fake data for testing — names, emails, phone numbers, addresses, UUIDs, dates, and more in bulk.

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Gradient Text Generator

Design

Create stunning CSS gradient text — pick colors, direction, and preview your text with a live gradient effect instantly.

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Number Formatter

Math

Format numbers with thousands separators, currency symbols, decimal places, and scientific notation — instant conversion for any locale.

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Fraction Calculator

Math

Add, subtract, multiply, and divide fractions — plus simplify, convert to decimals, and find mixed numbers. Step-by-step results.

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LCM & GCD Calculator

Math

Calculate the Least Common Multiple (LCM) and Greatest Common Divisor (GCD) of two or more numbers — with step-by-step prime factorization.

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Clothes Size Converter

Lifestyle

Convert clothing sizes between US, UK, EU, and Asian standards — for tops, bottoms, dresses, and children's clothing.

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Barcode Generator

Developer

Generate Code 39 barcodes instantly in your browser — enter text or numbers and download as PNG. No sign-up required.

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Electricity Bill Calculator

Finance

Calculate your monthly electricity bill by adding appliances, their wattage and daily usage — see exact costs per device and total cost.

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Zodiac Sign Calculator

Lifestyle

Find your zodiac sign, element, ruling planet, personality traits, lucky numbers, and compatible signs — just enter your birthday.

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Life Path Number Calculator

Lifestyle

Calculate your numerology Life Path Number from your birthday — discover your core traits, strengths, career paths, and compatibility.

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.gitignore Generator

Developer

Generate a ready-to-use .gitignore file for any language or framework — Node.js, Python, Java, Go, Rust, Swift, and more.

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Cover Letter Generator

Writing

Generate a professional cover letter instantly — enter the job title, company, your name, skills, and experience to get a polished letter.

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Pet Age Calculator

Lifestyle

Convert your dog or cat's age to human years using scientifically-based formulas — get breed size adjustments for dogs and life stage info.

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Inflation Calculator

Finance

Calculate how inflation affects purchasing power over time — enter an amount, start year, and end year to see today's equivalent value.

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A/B Test Calculator

Marketing

Calculate statistical significance for A/B tests — compare control vs variant conversion rates and see if results are significant at 90%, 95%, or 99% confidence.

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JSON to SQL

Developer

Convert JSON objects or arrays into SQL INSERT statements — supports MySQL, PostgreSQL, SQLite, and generic SQL dialects.

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CSS Unit Converter

Developer

Convert CSS units instantly — px, em, rem, vw, vh, pt, pc, cm, mm, and inches with custom base font size and viewport dimensions.

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CSP Header Generator

Security

Generate Content-Security-Policy HTTP headers for your web app — configure default-src, script-src, style-src, img-src, font-src, and more.

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Eye Care Timer (20-20-20)

Health

Protect your eyes with the 20-20-20 rule — every 20 minutes, get reminded to look 20 feet away for 20 seconds. Includes desktop notifications.

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Number Sequence Finder

Math

Detect patterns in number sequences and predict the next terms — identifies arithmetic, geometric, Fibonacci, quadratic, perfect squares, and cubic sequences.

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Click Speed Test

Lifestyle

Test how fast you can click with this CPS (Clicks Per Second) test — choose 5, 10, or 15 seconds, see your score, and compare to average benchmarks.

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Reaction Time Test

Health

Measure your reaction time in milliseconds — wait for the green signal, click as fast as possible, and see your average across 5 rounds with a performance rating.

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Palindrome Checker

Writing

Check if a word, phrase, or sentence is a palindrome — reads the same forward and backward, ignoring spaces, punctuation, and case. Works for any language.

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Sudoku Generator

Education

Generate and solve Sudoku puzzles in your browser — choose Easy, Medium, or Hard difficulty, get hints, check your solution, or reveal the answer instantly.

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Bill Split Calculator

Finance

Split any bill among friends — enter the total, number of people, tip percentage, and optional custom names to get an itemized per-person breakdown.

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Debt-to-Income Calculator

Finance

Calculate your debt-to-income (DTI) ratio to see if you qualify for loans — enter your monthly debts and gross income to get your DTI with lender benchmarks.

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Calorie Deficit Calculator

Health

Calculate the exact calorie deficit needed to hit your weight loss goal — enter your stats, choose your activity level, and get a personalized daily calorie target with a timeline.

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FIRE Number Calculator

Finance

Calculate your Financial Independence, Retire Early (FIRE) number — how much you need to save to retire and never work again, based on the 4% safe withdrawal rule.

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Binary to Text Converter

Developer

Convert binary code to readable text (ASCII) and text back to binary — supports space-separated 8-bit binary, hex input, and bulk conversion with copy output.

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Dice Roller

Lifestyle

Roll any combination of dice online — d4, d6, d8, d10, d12, d20, d100 with custom quantity and modifiers. Perfect for D&D, board games, and tabletop RPGs.

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HTML Entities Reference

Developer

Searchable reference for all HTML entities — find the HTML code, decimal, hex, and Unicode for any symbol, arrow, math operator, currency sign, or special character.

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Credit Score Simulator

Finance

Simulate how financial actions affect your credit score — see the estimated impact of paying off debt, missing payments, opening new accounts, and more.

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Neumorphism CSS Generator

Design

Generate CSS neumorphism (soft UI) effects with real-time preview — adjust color, size, blur, distance, and shape to get the perfect soft-shadow style.

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Glassmorphism CSS Generator

Design

Generate CSS glassmorphism effects with real-time frosted-glass preview — control blur, transparency, border opacity, and border radius to achieve the glass look.

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vCard Generator

Productivity

Create a downloadable vCard (.vcf) contact file for sharing your digital business card — fill in name, phone, email, website, organization, and address.

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CSS Triangle Generator

Developer

Generate CSS-only triangles using border tricks — choose from 8 directions, pick color and size, then copy the ready-to-use CSS snippet with live preview.

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Loan Eligibility Checker

Finance

Quickly check if you might qualify for a loan — enter income, existing debts, credit score range, and desired loan amount to get an instant eligibility estimate with tips.

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HTML to Plain Text

Developer

Strip HTML tags from any code and extract clean plain text — removes all markup, decodes HTML entities, and preserves or collapses whitespace for readable output.

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File Size Converter

Developer

Convert file sizes between bytes, kilobytes, megabytes, gigabytes, terabytes, and petabytes using either binary (1024) or decimal (1000) base — see all units at once.

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Color Shades & Tints Generator

Design

Generate a full palette of shades and tints from any hex color — get lighter and darker variations with hex values to copy, perfect for design systems and CSS variables.

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Tailwind CSS Color Palette

Design

Browse all official Tailwind CSS colors with hex values — click any swatch to copy the hex, RGB value, or Tailwind class name. Filter by color family with instant search.

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Git Cheat Sheet

Developer

Searchable Git commands reference — find any git command by name or description instantly, with syntax and explanations across setup, branching, remote, stash, undo, and more.

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Docker Run to Compose Converter

DevOps

Convert any docker run command to a ready-to-use docker-compose.yml — paste the command and instantly get ports, volumes, env vars, restart policy, and networks mapped.

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TDEE Calculator

Health

Calculate your Total Daily Energy Expenditure (TDEE) — enter age, weight, height, gender, and activity level to get daily calorie needs for maintenance, loss, and gain.

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Menstrual Cycle Calculator

Health

Track your menstrual cycle — enter your last period start date and average cycle length to predict your next period, fertile window, and ovulation day up to 6 months ahead.

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TikTok Caption Generator

Marketing

Generate engaging TikTok captions with relevant hashtags — describe your video content and niche to get scroll-stopping captions with trending hashtag combos for maximum reach.

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YouTube Title Generator

SEO

Generate click-worthy YouTube titles optimized for search — enter your topic and target audience to get 10 title variations with power words, numbers, and SEO best practices.

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CSS Variables Generator

Developer

Build a complete CSS custom properties design token system — define colors, spacing, typography, and border radius values and get a ready-to-paste :root {} block.

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Loan-to-Value (LTV) Calculator

Finance

Calculate your loan-to-value ratio for a mortgage or refinance — see if you qualify for the best rates, avoid PMI, and understand your home equity position instantly.

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Image Flip & Rotate

Image

Flip and rotate images in your browser — upload any photo, rotate left/right in 90° steps, flip horizontally or vertically, and download the result as PNG instantly.

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CSS Filter Generator

Developer

Generate CSS filter properties with a live visual preview — adjust blur, brightness, contrast, saturation, hue-rotate, sepia, grayscale, and invert with interactive sliders.

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HTML Beautifier

Developer

Beautify and format messy or minified HTML — paste compressed HTML and get properly indented, readable code with configurable indentation style in one click.

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Color Wheel & Harmonies

Design

Explore color theory with an interactive color wheel — click any color or enter a hex code to instantly see complementary, triadic, analogous, tetradic, and split-complementary palettes.

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HTTP Security Headers Generator

DevOps

Generate a complete set of HTTP security headers — choose Basic, Standard, or Strict level and get HSTS, CSP, X-Frame-Options, Referrer-Policy, Permissions-Policy, and Cross-Origin headers with an Nginx snippet.

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Excel Formula Generator

Productivity

Generate Excel and Google Sheets formulas instantly — pick from 15 formula types, enter your cell references, and get the complete ready-to-use formula with a plain-English explanation.

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Image Cropper

Image

Crop any image in your browser — upload a photo, drag to select your crop area, and download the cropped result instantly as PNG. No server upload, fully private.

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ASCII Table Generator

Developer

Convert CSV or tab-separated data into beautifully formatted ASCII text tables — paste your data, choose a border style, and copy the plain-text table for documentation or terminal output.

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Bulk Email Validator

Marketing

Validate multiple email addresses at once — paste a list of emails and instantly see which are valid, which have invalid format, and which use disposable or role-based addresses.

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Savings Rate Calculator

Finance

Calculate your personal savings rate and see how it impacts your path to financial independence — enter your income and expenses to find your savings rate and estimated years to FIRE.

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Writing Prompt Generator

Writing

Generate creative writing prompts for fiction, journaling, screenwriting, and more — pick a genre and get an instant prompt to spark your next story or journal entry.

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Ohm's Law Calculator

Education

Calculate voltage, current, resistance, and power using Ohm's Law — enter any two known values and instantly solve for the other two with V=IR and P=IV formulas.

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CSS Text Shadow Generator

Design

Create stunning CSS text shadow effects visually — adjust horizontal offset, vertical offset, blur radius, and color with live preview, then copy the ready-to-use CSS declaration.

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Percentage Change Calculator

Math

Calculate percentage increase or decrease between two values — enter an original and new value to get the percentage change, absolute difference, and direction instantly.

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Image Metadata Viewer

Image

View hidden metadata from any image file — upload a photo to instantly see file size, dimensions, type, and basic EXIF-style info without uploading to any server.

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JSON Minifier

Developer

Minify JSON by removing all whitespace, line breaks, and comments — paste any formatted or pretty-printed JSON and get the smallest possible valid JSON string in one click.

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Resistor Color Code Calculator

Education

Decode resistor color bands to get resistance value and tolerance — select 4 or 5 color bands and instantly see the resistance in ohms, kilohms, or megaohms with tolerance range.

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CSS Loader Generator

Design

Generate animated CSS loading spinners — choose from 8 spinner styles, customize size and color, and copy the ready-to-use CSS and HTML code instantly.

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Phone Number Validator

Developer

Validate and format phone numbers — check if a phone number is valid, detect country code, format to E.164 and international notation, and see the number type.

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HTML Color Codes Reference

Design

Browse all 140+ HTML named colors with their hex, RGB, and HSL values — search by name or hex, filter by hue family, and copy any color code in one click.

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Crypto Fee Calculator

Finance

Calculate crypto trading fees and net profit — enter trade amount, buy/sell prices, and exchange fee rate to instantly see fees paid, net profit/loss, and break-even price.

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SVG Path Visualizer

Design

Visualize and debug SVG path d attributes — paste any SVG path data and see it rendered in a canvas with labeled anchor points, control handles, and command breakdown.

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CSS Reset Generator

Developer

Generate a customized CSS reset or normalize stylesheet — choose from popular presets (Eric Meyer, Normalize.css, Modern CSS Reset, Tailwind Preflight) or build your own.

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CSS Button Generator

Design

Generate beautiful CSS buttons with live preview — customize color, size, border radius, shadow, hover effects, and copy the ready-to-use HTML and CSS code.

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Variable Name Generator

Developer

Convert any phrase into all standard variable naming conventions — camelCase, PascalCase, snake_case, SCREAMING_SNAKE, kebab-case, and more — in one click.

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Year Progress Tracker

Lifestyle

See exactly how much of the current year, month, and day has passed — with live progress bars, countdown to year end, and time elapsed since January 1st.

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Sleep Debt Calculator

Health

Calculate your cumulative sleep debt — enter your actual vs ideal sleep for the past week and see how many hours behind you are, plus tips to recover your sleep deficit.

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Credit Card Validator

Finance

Validate credit card numbers using the Luhn algorithm — instantly detect card type (Visa, Mastercard, Amex, Discover), check validity, and format the number correctly.

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Color to Tailwind CSS

Developer

Find the nearest Tailwind CSS color class for any hex, RGB, or HSL color — paste your color and instantly get the closest Tailwind palette match with the class name to use.

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JSON to XML Converter

Developer

Convert JSON data to well-formatted XML instantly — paste any valid JSON and get clean XML output with proper indentation, attributes, and root element wrapping.

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Scientific Notation Converter

Math

Convert numbers to and from scientific notation instantly — enter a standard number or scientific notation and get the converted result with step-by-step explanation.

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Proportion Calculator

Math

Solve proportions and ratios instantly — enter three values in a/b = c/d format and find the missing fourth value, with cross-multiplication steps shown.

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Mortgage Points Calculator

Finance

Calculate whether buying mortgage discount points is worth it — compare upfront cost vs monthly savings, break-even timeline, and total interest saved over the loan term.

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QR Code Scanner

Developer

Scan and decode QR codes directly in your browser — upload an image containing a QR code and instantly extract the encoded text, URL, or data without any app needed.

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BAC Calculator

Health

Estimate your Blood Alcohol Content (BAC) based on drinks consumed, body weight, gender, and time elapsed — know when it's safe to drive with a science-based formula.

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Capital Gains Tax Calculator

Finance

Calculate your capital gains tax on investments — enter purchase price, sale price, holding period, and income to instantly see short-term vs long-term tax owed.

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Wind Chill & Heat Index Calculator

Lifestyle

Calculate the real-feel temperature with wind chill (cold weather) or heat index (hot weather) — enter temperature and wind speed or humidity to get what it actually feels like outside.

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Coffee Ratio Calculator

Lifestyle

Get the perfect coffee-to-water ratio for any brew method — enter your desired cups and choose your brewing style to get exact gram measurements for barista-quality coffee every time.

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Keyboard Tester

Developer

Test every key on your keyboard directly in the browser — press any key to see its key code, key name, and event properties. Perfect for debugging keypress events and checking keyboard functionality.

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Audio Cutter

Productivity

Trim audio files to exact millisecond precision. Upload MP3, WAV, or OGG, select start and end points on the waveform, preview the selection, and download the trimmed audio.

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Video Cutter

Productivity

Trim video files with millisecond precision. Upload MP4, WebM, or MOV, select the exact portion you want, preview it, and download the trimmed clip.

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PDF Merger

Document

Merge multiple PDF files into one document directly in your browser.

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Equation Solver

Math

Solve linear, quadratic, and system of two linear equations step-by-step. Enter your equation and get the solution with full working shown.

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Debt Snowball Calculator

Finance

Compare debt snowball vs debt avalanche payoff strategies. Enter your debts, see which method saves more interest, and get a month-by-month payoff schedule.

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Intermittent Fasting Timer

Health

Track your intermittent fasting window with a real-time countdown. Choose from popular protocols (16:8, 18:6, 20:4, OMAD, 5:2) or set a custom schedule.

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Mermaid Diagram Editor

Developer

Create flowcharts, sequence diagrams, Gantt charts, and more with Mermaid syntax. Live preview updates as you type. Export as SVG.

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Kanban Board

Productivity

A simple browser-based Kanban board with To Do, In Progress, and Done columns. Add task cards with priorities. Data saved in localStorage.

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Weekly Planner

Productivity

Plan your week with a clean 7-day schedule grid. Add tasks and events to each day, set priorities, and print your weekly plan or export it as text.

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Sudoku Solver

Education

Enter any sudoku puzzle and get the solution instantly. Paste a puzzle, fill in the grid, and click Solve to see the answer with step counts.

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Typing Tutor

Education

Improve your typing with structured lessons. Practice home row keys, numbers, symbols, and full sentences. Track accuracy and WPM in real time.

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Freelance Rate Calculator

Finance

Calculate the ideal freelance hourly rate based on your desired income, expenses, billable hours, and taxes. See your minimum and target rates instantly.

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CSS Transform Generator

Developer

Visually generate CSS transform properties. Adjust translate, rotate, scale, and skew sliders to see a live preview and copy the CSS output.

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Image to PDF

Image

Convert one or multiple images (JPG, PNG, WebP) into a single PDF document entirely in your browser. No upload, no server — pure client-side.

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Text to Handwriting

Writing

Convert typed text into handwriting-style output rendered on a lined paper canvas. Choose ink color, font size, and paper style, then download as PNG.

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Social Media Bio Generator

Writing

Generate a professional, catchy bio for Instagram, Twitter/X, LinkedIn, TikTok, or YouTube. Enter your name, profession, and interests — get a polished bio instantly.

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Image Format Converter

Image

Convert images between JPG, PNG, WebP, and BMP formats entirely in your browser. No upload, no server — fast client-side conversion using the Canvas API.

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Time Blocking Planner

Productivity

Plan your day using time blocking — assign tasks to specific time slots and visualize your schedule. Add, edit, and reorder blocks to build a productive daily plan.

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Debt Avalanche Calculator

Finance

Pay off your debts faster using the avalanche method — pay minimums on all debts, then throw extra money at the highest-interest debt first. Compare total interest saved.

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Changelog Generator

Developer

Generate a formatted changelog from your commit messages or release notes. Supports Keep a Changelog format, markdown output, and semantic versioning grouping.

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CSS Media Query Generator

Developer

Generate CSS media queries for responsive design. Choose common device breakpoints or enter custom min/max widths and orientations. Copy the ready-to-use CSS snippet.

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SQL Query Builder

Developer

Build SQL SELECT queries visually without writing raw SQL. Enter table name, choose columns, add WHERE conditions, ORDER BY, and LIMIT — get the query instantly.

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Dividend Calculator

Finance

Calculate your annual and monthly dividend income from stocks. Enter stock price, dividend per share or yield, and number of shares. See projected income and DRIP growth.

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Cooking Timer

Lifestyle

Run multiple named cooking timers simultaneously. Add a timer for each dish, watch them count down, and get an alert when each one finishes. Perfect for cooking multiple dishes.

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Expense Tracker

Finance

Track your daily expenses by category — Food, Transport, Housing, Entertainment, Health, and more. See spending totals and breakdown instantly, all stored in your browser.

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Time Zone Meeting Planner

Productivity

Find the best meeting time across multiple time zones. Enter your locations and a proposed time to see what time it is for everyone. Avoid scheduling conflicts with remote teams.

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SVG Optimizer

Design

Clean and minify SVG code by removing comments, metadata, editor cruft, and unnecessary whitespace. Paste your SVG and get a leaner, faster-loading optimized version.

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Font Pairing Generator

Design

Discover beautiful font combinations for your next design project. Browse curated heading and body font pairings from Google Fonts with live preview. Copy the CSS import instantly.

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API Response Formatter

Developer

Format, validate, and analyze API responses. Paste raw JSON or XML to get a pretty-printed, syntax-highlighted version. See response size, key count, and nested structure depth.

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Retirement Savings Calculator

Finance

Calculate how much you need to save monthly to reach your retirement goal. Enter your age, retirement age, current savings, expected return, and target amount to get a personalized plan.

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README Generator

Developer

Generate a professional README.md file for your GitHub project. Enter your project name, description, tech stack, installation steps, and usage instructions to get a formatted markdown README instantly.

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Meme Generator

Image

Create custom memes instantly. Choose from popular meme templates or upload your own image, add top and bottom text with custom colors and font sizes, then download your meme as a PNG. 100% browser-based.

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Receipt Generator

Finance

Generate professional receipts instantly. Enter business name, items, quantities, prices, tax rate, and payment method to produce a clean, printable receipt. Perfect for freelancers and small businesses.

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Coin Flip

Lifestyle

Flip a virtual coin to make quick decisions. Animated heads or tails result with flip history and statistics. Flip multiple coins at once. Perfect for settling disputes or random choices.

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Word Search Generator

Education

Generate printable word search puzzles from your own word list. Enter up to 20 words, choose grid size, and get an instant word search puzzle with answer key. Perfect for teachers and students.

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ASCII to Hex Converter

Developer

Convert ASCII text to hexadecimal and back. Supports spaces, punctuation, and special characters. See decimal, octal, and binary representations alongside hex. Perfect for developers and encoding tasks.

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Hreflang Tag Generator

SEO

Generate hreflang HTML tags for international SEO. Select languages and enter URLs for each locale to create the correct link rel=alternate tags for your multilingual website's head section.

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License Generator

Developer

Generate open source license text for your project. Choose from MIT, Apache 2.0, GPL v3, BSD, ISC, Unlicense, or CC0. Enter your name and year to get the complete license ready to add to your project.

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Robots.txt Validator

SEO

Validate your robots.txt file syntax and check for common errors. Paste your robots.txt content to see a detailed report of user-agents, disallow/allow rules, sitemaps, and any issues affecting crawling.

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Color Temperature Converter

Design

Convert color temperature in Kelvin to RGB and hex color values. See the actual color produced by any light source from candles to open sky. Essential for photography, videography, and lighting design.

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File Hash Calculator

Security

Calculate SHA-1, SHA-256, and SHA-512 cryptographic hash values for any file or text input directly in your browser. Verify file integrity, detect tampering, and confirm checksums — no server upload required.

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JSON to Table

Developer

Convert JSON arrays into a formatted HTML table instantly. Paste any JSON array and see it as a clean, readable table with column headers auto-detected from keys. Export as HTML or copy as TSV.

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Tally Counter

Productivity

A digital multi-counter tally tool for counting anything. Create multiple named counters, increment or decrement with a click, set custom step values, and track totals in real time.

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CSS Selector Tester

Developer

Test CSS selectors against an HTML snippet in real time. Enter your HTML, type a CSS selector, and instantly see which elements match — with match count, tag names, classes, and IDs listed.

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Text Wrapper

Writing

Wrap or unwrap text at a specified column width. Useful for formatting code comments, plain-text emails, markdown, and terminal output. Set your desired line length and get properly wrapped text instantly.

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Heat Index Calculator

Health

Calculate the apparent 'feels like' temperature by combining actual air temperature and relative humidity. Get heat risk level, safety guidelines, and understand how humidity amplifies heat stress on your body.

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Paycheck Calculator

Finance

Estimate your take-home pay after federal income tax, Social Security, and Medicare (FICA) deductions. Enter your gross salary, filing status, and pay frequency to see net pay per paycheck, monthly, and annually.

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Blood Pressure Checker

Health

Check if your blood pressure reading is normal, elevated, or in a hypertension stage. Enter your systolic and diastolic values and instantly see your BP category, risk level, and recommended actions based on AHA guidelines.

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Keto Calculator

Health

Calculate your ideal ketogenic diet macros — fat, protein, and carbohydrates — based on your body weight, height, age, activity level, and goal. Get daily calorie targets and macro percentages for entering and maintaining ketosis.

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Pixel Density Calculator

Design

Calculate the pixel density (PPI — pixels per inch) of any display from its resolution and screen size. Perfect for comparing monitors, phones, and tablets. Also calculates dot pitch and total megapixels.

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Contrast Ratio Checker

Design

Check the WCAG 2.1 color contrast ratio between foreground and background colors. Instantly see if your text passes AA or AAA accessibility standards for normal text, large text, and UI components. Essential for inclusive web design.

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IBAN Validator

Finance

Validate and parse International Bank Account Numbers (IBAN) instantly in your browser. Checks the structure, country code, check digits, and length of any IBAN. Works offline, supports all 75+ IBAN countries.

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GST / VAT Calculator

Finance

Calculate GST or VAT inclusive and exclusive prices in seconds. Enter the base price and tax rate to find the tax amount and total price. Supports reverse calculation to extract tax from a tax-inclusive amount.

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Pixel Art Maker

Design

Create pixel art directly in your browser with a grid-based canvas. Choose your grid size, pick colors from a palette, draw pixel by pixel, and export your creation as a PNG image — no software installation required.

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Watermark Tool

Image

Add a custom text watermark to any image directly in your browser. Choose the text, font size, color, opacity, and position. Works entirely client-side — your images never leave your device. Export as PNG.

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JSON to Go Struct

Developer

Convert any JSON object into Go struct types instantly. Paste your JSON and get clean, idiomatic Go struct definitions with proper field names, types, and json tags. Supports nested objects and arrays.

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Backlink Checker

SEO

Analyze your website's backlink profile and discover link-building opportunities. Enter your URL to get an SEO link audit with authority signals, anchor text recommendations, and actionable strategies to earn high-quality backlinks.

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HTML Form Builder

Developer

Build HTML forms visually without writing code. Add fields like text, email, password, select, checkbox, radio, and textarea. Configure labels, placeholders, and required flags. Preview instantly and copy the generated HTML.

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Resume Keyword Checker

Writing

Compare your resume against a job description to find keyword matches and gaps. Paste both texts to get an ATS match score, list of matched keywords, missing important terms, and tips to optimize your resume for applicant tracking systems.

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GitHub README Generator

Developer

Generate a professional GitHub profile README.md in seconds. Fill in your name, title, bio, skills, and social links — get a beautifully formatted Markdown file with badges, stats sections, and a personalized introduction ready to copy.

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Sleep Cycle Calculator

Health

Calculate the best times to wake up or go to sleep based on 90-minute sleep cycles. Enter your bedtime or desired wake time to find optimal sleep windows that help you wake up feeling refreshed instead of groggy.

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Calorie Burn Calculator

Health

Estimate calories burned during exercise based on activity type, body weight, and duration. Supports 30+ activities from running and cycling to yoga and swimming. Uses MET (Metabolic Equivalent of Task) values for accurate estimates.

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Dockerfile Generator

Developer

Generate production-ready Dockerfiles for your projects. Choose your language or framework (Node.js, Python, Go, Java, PHP, Ruby, and more), configure ports, environment variables, and build options to get a clean, optimized Dockerfile.

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GitHub Actions Generator

DevOps

Generate GitHub Actions CI/CD workflow YAML files without memorizing syntax. Choose your trigger, runner OS, language, and steps (install, test, build, deploy) to get a ready-to-use .github/workflows/ file for your repository.

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Rule of 72 Calculator

Finance

Use the Rule of 72 to quickly estimate how long it takes to double your investment at a given annual return rate. Also works in reverse — find the return rate needed to double money in a target number of years. Simple, powerful mental math for investors.

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Gratitude Journal

Lifestyle

Build a daily gratitude practice with this private, browser-based journal. Write three things you're grateful for each day, add a reflection, and review your past entries. All data stays in your browser — completely private, no account needed.

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Text to Table Converter

Developer

Convert comma-separated, tab-separated, or pipe-delimited text into formatted HTML or Markdown tables instantly. Paste your raw data, choose a delimiter, and get a clean table ready to use in web pages, documentation, or GitHub.

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Google Snippet Preview

SEO

Preview exactly how your page title, URL, and meta description will appear in Google search results before publishing. Instantly spot truncation issues, optimize for click-through rates, and fine-tune your SEO metadata with real-time character counts.

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Payroll Calculator

Finance

Calculate your net take-home pay from gross salary. Enter your gross pay, federal and state tax rates, Social Security, Medicare, and other deductions to instantly see your net pay, effective tax rate, and a full paycheck breakdown for hourly or salaried employees.

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Dog Age Calculator

Lifestyle

Calculate your dog's age in human years using the scientifically-backed formula based on DNA methylation research. Results vary by dog size (small, medium, large) since larger dogs age faster. Includes life stage milestones and health checkup reminders.

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JavaScript Obfuscator

Developer

Obfuscate your JavaScript code to make it harder to reverse-engineer. Renames variables and functions to short meaningless names, encodes string literals, removes comments, and minifies whitespace — all client-side with no code ever sent to a server.

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Essay Outline Generator

Writing

Generate a structured essay outline in seconds. Enter your topic, thesis statement, and number of body paragraphs, then choose an essay type (argumentative, expository, compare-contrast, persuasive) to get a ready-to-use outline with intro, body points, and conclusion.

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Choose a Tool

Browse our library of 413+ tools organized across 17 categories, or type a keyword in the search bar to jump straight to what you need.

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WHY FASTTOOL

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Most tool websites force you to create an account before you can even try a feature. FastTool takes the opposite approach: every single tool is available immediately, with no email address, no password, and no profile to manage. You arrive, you use the tool, and you leave. It is that simple. We believe productivity should not require paperwork.

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Privacy is not a marketing slogan here. When you convert an image, format JSON, or generate a password, the computation runs entirely inside your browser using JavaScript. Your data never touches our servers because there is no server-side processing to speak of. This architecture means faster results, offline capability for many tools, and genuine data privacy by design.

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From developer utilities like JSON formatters, regex testers, and hash generators to everyday essentials like unit converters, tip calculators, and color pickers, the catalog covers 17 distinct categories. Each tool is purpose-built with a clean interface, copy-ready outputs, and mobile-friendly layouts. New tools are added regularly based on real user demand.

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FastTool serves a global audience. The interface is available in 21 languages including English, Spanish, French, German, Arabic, Hindi, Chinese, Japanese, Korean, Portuguese, and more. Right-to-left languages like Arabic and Urdu are fully supported with proper layout mirroring, so every user gets a native-feeling experience regardless of their location.

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“I use the JSON formatter, regex tester, and Base64 encoder almost every day. Having them all in one place without needing to install extensions or sign up for anything has genuinely streamlined my workflow. The tools load fast and give me exactly what I need.”
Full-Stack Developer
“The color picker, gradient generator, and CSS shadow tools are perfect for quick prototyping. I used to bounce between three or four different websites to get these utilities. Now I just open FastTool and everything is in one tab. Great time saver.”
UI/UX Designer
“The math calculators and unit converters have been incredibly helpful for my coursework. I appreciate that everything runs in the browser because my university network blocks a lot of software downloads. Being able to switch the language to my native tongue is a nice bonus too.”
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