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BUILT FOR 2026 111 reviewed tools guided workflows 0 signups browser-first tools

Fast Tools Online, Ready for People and AI Agents.

Fast browser tools and AI-agent-ready workflows for PDFs, JSON, images, SEO, writing, calculators, security checks, and no signup.

Try now: AI agent page auditor AI crawler policy Query fan-out Video cutter Video compressor MP4 to MP3 PDF merger JSON formatter Image compressor Remove EXIF Invoice generator Resume builder
Open Answer Engine Build a task plan Open Workflow Studio Browse Task Library Find the right tool Browse 111 Reviewed Tools

Clear privacy boundaries Local processing where supported 21 languages Dark mode

Popular right now

Reviewed tools 62
Categories 17
Top category Developer

YOUR FASTTOOL WORKSPACE

Continue, decide, or verify quality

FastTool now behaves like a repeat-use workspace, not a one-off directory. Recent tools and saved tools stay in this browser only.

AI AGENT AND ANSWER ENGINE KIT

The tool cluster built for how search works now

Open AI Agent Tools →

FastTool now has a dedicated layer for AI agents, answer engines, and modern search: audit whether a page is agent-readable, build the right AI crawler policy, simulate query fan-out, check citation readiness, create agent task contracts, classify human-vs-bot traffic, and calculate the hidden cost of supervising AI work.

Traffic truth

AI Traffic Source Classifier

Separate likely humans, direct/unknown rows, Google/Bing referrals, AI referrals, AI crawlers, training bots, and suspicious automation.

Agent SEO

AI Agent Page Auditor

Check whether a page gives browser agents visible actions, labels, proof, trust boundaries, and copyable handoff data.

Crawler policy

AI Crawler Policy Builder

Separate AI search crawlers, user-triggered agents, and training bots so visibility decisions are deliberate.

Answer engine

Query Fan-Out Simulator

Turn one search into related subquestions, content blocks, internal links, and proof sections.

Citation

AI Citation Readiness Checker

Score whether a page has clear, sourceable, non-commodity passages that answer engines can responsibly cite.

Agent ops

Agent Task Contract Studio

Turn a messy request into objective, inputs, permissions, stop rules, acceptance tests, and output schema.

ROI

Botsitting Cost Calculator

Count prompt time, review time, reruns, corrections, error risk, and decide whether AI really saves work.

Agent QA

Agent Output Evaluator

Score whether an AI agent final answer is backed by evidence, acceptance tests, stop rules, and residual-risk notes.

DAILY TOOL DESK

Come back to the same useful workflows

FastTool is organized around repeat tasks: answer routes, publish checks, API debugging, document cleanup, image prep, text review, and everyday calculators.

Answer Engine

Ask the job and get a route

Type a practical question like "compress a PDF before email" or "fix invalid JSON" and get a reviewed path with sample input, expected output, and checks.

Task OS

Turn a problem into a verified plan

Describe the job and get a tool chain, safe test sample, expected output, verification checklist, and caution notes before you start.

Start here

Continue a real workflow

Use ordered steps, local progress, output checks, and exportable checklists for API data, PDFs, images, writing, design, calculations, and security tasks.

Choose

Find the right starting tool

Not sure where to begin? Pick the task first, then jump into reviewed tool pages with clear trust checks.

Debug

Fix JSON and API payloads

Format, validate, compare, encode, decode, and convert structured data without leaving the browser.

Images

Compress an image for upload

Reduce file size locally, then resize or convert the image when a form, store, or document needs a specific format.

Documents

Clean up a PDF workflow

Use ordered PDF tools for conversion, extraction, compression, merging, splitting, and browser-first document fixes.

Writing

Check text before sending

Count words, characters, reading time, and structure before publishing copy, emails, posts, or documentation.

Finance

Run a practical money check

Compare loans, interest, savings, investment growth, tax assumptions, and everyday finance decisions with transparent calculators.

FINISH-FIRST KITS

The highest-value jobs now have professional workflow kits

Open all kits →

These are not generic landing pages. Each kit starts with a real task, then gives the safest route, the right tools, a sample input, expected output, proof checks, common mistakes, and a clear not-for boundary.

Career

Job Application PDF Kit

Build an ATS-friendly resume path, check keywords, export a PDF, and prepare for upload.

EXACT FINISH ROUTES

Open the page that finishes the job, not a generic directory

Open finish routes →

These routes target the searches where people want a result immediately: a smaller PDF, a cut video, a fixed JSON payload, an upload-ready image, or a checked invoice. Each page includes the starting tool, safe sample, expected output, a local Smart Run Sheet, proof checks, privacy boundary, not-for cases, and a local Proof Passport receipt.

Different

Smart Run Sheet

Before using a tool, generate a local readiness score, risk warning, first tool, and proof plan based on target, file sensitivity, device, and time pressure.

Different

Proof Passport receipts

After using a tool, check the output and copy a local verification receipt for your notes, client handoff, support ticket, or repeat workflow.

Developer

Fix a JSON API error fast

Validate the smallest safe payload, remove secrets, and confirm syntax before retesting in the real client.

PDF data

Extract PDF table to CSV

Pull table-like PDF text into spreadsheet-ready rows, then check row count, columns, and wrapped cells.

Local business

Create a guest WiFi QR code

Generate a scannable guest-network QR, test it on a phone, and avoid exposing private admin WiFi.

QUALITY GATE

Reviewed tools first, weaker pages held back

Run the live lab →

FastTool is moving from catalog quantity to task quality. The homepage promotes reviewed pages with realistic inputs, expected outputs, limitation notes, live output checks, and review evidence first. Broader direct-use utilities remain available by URL, while generic pages stay out of search until they are rewritten with stronger examples and clearer user value.

Live proof

Run the Live Quality Lab

Run deterministic browser checks for JSON, Base64, URL encoding, CSV, calculators, contrast, UUIDs, passwords, JWTs, regex, and text counting.

Before upload

Check File Readiness

Inspect file type, size, upload fit, privacy risk, and the best FastTool workflow locally before a form, client, or social platform rejects it.

Completion proof

Build a Proof Pack

Document before/after metrics, acceptance checks, risks, recommended routes, and copyable handoff notes after a tool job is done.

Acceptance

Build an Output Contract

Define measurable pass/fail criteria for PDFs, images, JSON, invoices, colors, loan estimates, and videos before trusting a result.

Reviewed now

111 reviewed tool pages

JSON, password, PDF, image, calculator, converter, and developer tools now include field-tested examples and practical trust notes.

Search quality

Noindex for unfinished pages

Utility pages that are useful but not yet differentiated stay available from the app, but they are removed from sitemap and search eligibility until rewritten.

User experience

Promote pages that solve the task

The goal is fewer weak landing pages and more paths that give visitors a clear input, a useful output, and a reason to come back.

WHY PEOPLE SHOULD LAND HERE

Searches FastTool is built to satisfy end-to-end

Ask the Answer Engine →

A visitor should not arrive, bounce, and continue searching. These routes start with the exact task language people use, then show the tool chain, a safe sample, the expected output, verification checks, and a clear stop condition.

Document intent

"compress PDF before email"

Merge, split, compress, extract, or convert documents, then verify page order, readable output, file size, and when the job needs a specialist instead of a browser tool.

Developer intent

"fix invalid JSON from an API"

Format the payload, locate the error, compare expected keys, test edge cases, and avoid pasting live credentials or session tokens.

Image intent

"make image smaller for upload"

Resize to the destination, compress, convert format when useful, and compare final quality before a website, form, store listing, or social card goes live.

Publishing intent

"check a page before publishing"

Review title, description, original examples, links, trust notes, and output evidence before a page is submitted to users, search engines, or ad review.

Business intent

"create invoice PDF and payment copy"

Generate the invoice, check totals, export a clean PDF, prepare a short payment note, and keep private client data in the browser workflow.

AI-agent intent

Machine-readable route map

Agents can read the intent map, LLM guide, and manifest to route a user to the strongest task page instead of guessing from a raw tool catalog.

TRENDING TOOLS

12 reviewed standouts

A curated mix of reviewed document, developer, image, writing, design, and calculator tools.

WritingWord & Character CounterWritingCount words, characters, lines, and estimated reading time. DeveloperJSON Formatter & ValidatorDeveloperFormat, minify, and validate JSON with syntax highlighting, tree view, JSON path on click, error detection with line/column, stats, and file upload/download. ImageImage CompressorImageCompress images in your browser, reduce file size while keeping quality. DocumentPDF MergerDocumentMerge multiple PDF files into one document directly in your browser. Drag to reorder, see page counts, and download the merged PDF instantly. browser-based — your standard processing stays in your browser. MathPercentage CalculatorMathCalculate percentages with 4 modes: X% of Y, what percent X is of Y, percentage change, and markup/discount. Real-time results with visual bar and stat cards. FinanceCompound Interest CalculatorFinanceCalculate compound interest with interactive growth chart, year-by-year table, and contribution breakdown. DesignColor PickerDesignPick colors with EyeDropper, get HEX/RGB/HSL/CMYK/HWB values, explore harmonies and gradients. SecuritySecure Password GeneratorSecurityGenerate strong passwords with custom length and character sets. DocumentHTML to PDF ConverterDocumentConvert raw HTML or local .html files to PDF with preview, CSS controls, and browser-only export. DeveloperRegex TesterDeveloperTest regex patterns with real-time match highlighting, capture groups, replace mode, and a built-in cheatsheet. HealthBMI CalculatorHealthCalculate BMI with visual gauge, color-coded results, age/gender context, and BMI reference chart. DeveloperUUID GeneratorDeveloperGenerate UUID v4 with bulk generation (1-100), format options (standard, uppercase, no dashes, Base64), UUID validator with version detection, click-to-copy, download as TXT, and generation history.

WHY FASTTOOL

What makes us different

Most online tool sites are ad-walls with a form on top. We built the opposite.

SMART STACKS

Turn a task into a tool workflow

Pick the job, then jump through the strongest tools in the right order.

BEST START

Type a task or choose a stack

Search for a job like compress image, SEO article, AI cost, or PDF merge.

  1. Image CompressorReduce file size before publishing.
  2. PDF MergerCombine documents before sharing or archiving.
  3. JSON FormatterClean and inspect structured data.

How it works

1

Pick a tool

Browse the 111 reviewed tools first; direct-use tools stay available by URL while weaker pages are rewritten.

2

Use it instantly

Reviewed tools are designed for fast browser-based work with no account required; some pages may load third-party resources for ads, analytics, fonts, or libraries as disclosed.

3

Get results

Copy, download, or share your results. Standard tool input stays in your browser where local processing is supported.

/ to search

BROWSE BY CATEGORY

Featured categories

Developer dataJSON, CSV, YAML, JWT DocumentsPDF merge, split, compress ImagesCompress, resize, convert WritingCount, read, prepare DesignContrast, palette, CSS Finance estimatesLoan and interest checks CalculationsPercent, unit, science Security valuesPasswords, UUIDs, hashes Health estimatesBMI with clear limits FocusPomodoro workflow Not sure?Ask the task first

START WITH A WORKFLOW

Reviewed workflows, not random browsing

These paths use reviewed tools only, so the homepage points users toward pages with stronger examples, limitations, and working browser output.

TASK WORKFLOWS

Start where search intent starts

All task routes →

Not sure which workflow matches the job? Use the Tool Finder to jump from a real task to the strongest public tool page.

PDF WORKFLOW

Prepare a PDF Packet

Turn messy document work into a checkable PDF route with sample input and output checks.

Open task route →

DATA WORKFLOW

Fix Invalid JSON

Move structured data from broken paste to clean, validated, copy-ready output.

Open task route →

IMAGE WORKFLOW

Make an Image Smaller

Prepare lighter, cleaner images for websites, documents, stores, and social posts.

Open task route →

PUBLISH WORKFLOW

Check a Page Before Publishing

Run a practical page-quality pass before publishing or updating a page.

Open task route →

DEVELOPER WORKFLOW

Clean Code Snippets

Format or minify snippets with a clear verification checklist.

Open task route →

FINANCE WORKFLOW

Compare Finance Estimates

Model common money decisions with transparent assumptions and clear limits.

Open task route →
111Reviewed tools
17Categories
$0Forever Free
LocalProcessing

TRENDING THIS WEEK

Reviewed tools worth trying first

JSON Formatter & ValidatorPopular

Developer

Format, minify, and validate JSON with syntax highlighting, tree view, JSON path on click, error detection with line/column, stats, and file upload/download.

Try it

Image CompressorPopular

Image

Compress images in your browser, reduce file size while keeping quality.

Try it

PDF MergerPopular

Document

Merge multiple PDF files into one document directly in your browser. Drag to reorder, see page counts, and download the merged PDF instantly. browser-based — your standard processing stays in your browser.

Try it

HTML to PDF ConverterNew

Document

Convert raw HTML or local .html files to PDF with preview, CSS controls, and browser-only export.

Try it

Regex TesterPopular

Developer

Test regex patterns with real-time match highlighting, capture groups, replace mode, and a built-in cheatsheet.

Try it

BMI CalculatorPopular

Health

Calculate BMI with visual gauge, color-coded results, age/gender context, and BMI reference chart.

Try it

Age Calculator

Lifestyle

Calculate your exact age in years, months, days, total weeks, hours, and minutes. See your zodiac sign, Chinese zodiac, generation label, birthday weekday, and countdown to your next birthday.

Open reviewed tool

Aspect Ratio Calculator

Design

Calculate and convert aspect ratios for images, video, and responsive design. Enter width and height to find the ratio, or enter a ratio plus one dimension to calculate the other. Lock ratio toggle, common presets (16:9, 4:3, 1:1, 21:9, 9:16), visual preview rectangle, and platform-specific size recommendations for YouTube, Instagram, Twitter, Facebook, and LinkedIn.

Open reviewed tool

Audio Cutter

Productivity

Trim MP3, WAV, OGG, or M4A audio with a waveform, preview the selection, and download a WAV cut from your browser.

Open reviewed tool

Base64 Encode/Decode

Developer

Encode and decode Base64 with text mode, file mode, image-to-Base64 data URI, Base64-to-image preview, URL-safe variant toggle, live conversion, character count, and download support.

Open reviewed tool

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.

Open reviewed tool

Case Converter

Writing

Convert text between UPPERCASE, lowercase, Title Case, Sentence case, camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE, aLtErNaTiNg CaSe, and Inverse Case with real-time preview and character stats.

Open reviewed tool

WCAG Contrast Checker

Design

Advanced WCAG 2.1 contrast checker with AA/AAA pass/fail badges, color blindness simulation, auto-fix suggestions, live text preview, and random accessible palette generator.

Open reviewed tool

Color Palette Generator

Design

Generate beautiful color palettes from any base color. Choose from complementary, analogous, triadic, split-complementary, tetradic, and monochromatic harmonies. Export as CSS variables, Tailwind config, or SCSS. Built-in contrast checker with WCAG AA/AAA compliance.

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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.

Open reviewed tool

CSS Gradient Generator

Design

Create stunning CSS gradients with linear, radial, and conic types. Angle slider, up to 8 color stops with position control, 20 beautiful presets, live preview, full-screen mode, and one-click CSS copy with vendor prefixes.

Open reviewed tool

CSV to JSON Converter

Data

Convert CSV to JSON or JSON to CSV with auto-delimiter detection. Upload .csv files or paste data. Preview table, toggle header row, handle quoted fields and edge cases. Download or copy output.

Open reviewed tool

cURL to Code Converter

Developer

Convert cURL commands to JavaScript fetch, Python requests, PHP cURL, Node.js axios, Go net/http, and Ruby net/http with syntax-highlighted output and one-click copy.

Open reviewed tool

Date Calculator

Productivity

Calculate exact date differences, business days, ISO week numbers, leap-year details, or add and subtract days from any date.

Open reviewed tool

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.

Open reviewed tool

Invoice Generator

Business

Create a professional invoice with company details, line items, tax, discount, notes, payment details, preview, print, and direct PDF download.

Open reviewed tool

JPG to PDF Converter

Document

Convert JPG, PNG, or WebP images into a downloadable PDF with drag reorder, fit-to-image, A4 or Letter page sizing, orientation, and margin controls.

Open reviewed tool

JWT Decoder

Security

Decode and inspect JWT tokens with color-coded header, payload, and signature sections. Check expiry status, verify HMAC-SHA256 signatures, and explore common JWT claims.

Open reviewed tool

Loan Calculator

Finance

Calculate loan payments with SVG balance chart, amortization table, extra payment savings, and payoff date for monthly, biweekly, or weekly schedules.

Open reviewed tool

Meta Tag Generator

SEO

Generate complete HTML meta tags with live Google SERP preview, Facebook and Twitter card previews, character count warnings, JSON-LD structured data, and a full SEO checklist.

Open reviewed tool

PDF Form Filler

Document

Fill interactive PDF form fields locally, optionally flatten the result, and download a completed PDF without uploading the document.

Open reviewed tool

PDF Merger

Document

Merge multiple PDF files into one document directly in your browser. Drag to reorder, see page counts, and download the merged PDF instantly. browser-based — your standard processing stays in your browser.

Open reviewed tool

PDF Page Remover

Document

Remove selected pages from a PDF in the browser, validate page ranges, keep the remaining pages, and download a new trimmed PDF.

Open reviewed tool

PDF Splitter

Document

Split PDF files into individual pages or custom page ranges directly in your browser. Extract specific pages, split every N pages, or split into single pages. browser-based — your standard processing stays in your browser.

Open reviewed tool

Percentage Calculator

Math

Calculate percentages with 4 modes: X% of Y, what percent X is of Y, percentage change, and markup/discount. Real-time results with visual bar and stat cards.

Open reviewed tool

Pomodoro Timer

Productivity

Focus timer with presets, streak tracking, daily stats, keyboard shortcuts, browser notifications, and multiple sound options.

Open reviewed tool

Prompt A/B Tester

Developer

Compare prompt variants by clarity, constraints, output format, ambiguity, examples, token cost, and instruction-following likelihood.

Open reviewed tool

QR Code Generator

Data

Generate QR codes for URLs, text, WiFi, vCard, email, SMS and phone — customize colors, size, error correction and logo overlay. Download as PNG or SVG.

Open reviewed tool

Readability Checker

Writing

Analyze text readability with 6 formulas: Flesch Reading Ease, Flesch-Kincaid, Gunning Fog, Coleman-Liau, SMOG, and ARI with SVG gauge and sentence complexity.

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Regex Tester

Developer

Test regex patterns with real-time match highlighting, capture groups, replace mode, and a built-in cheatsheet.

Open reviewed tool

Resume Builder

Productivity

Build a clean resume with templates, experience, education, skills, languages, live preview, print, and direct PDF download without an account.

Open reviewed tool

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.

Open reviewed tool

Scientific Calculator

Math

Full scientific calculator with dark theme UI, trig functions (sin/cos/tan), logarithms, factorial, powers, memory (M+/M-/MR/MC), degree/radian toggle, parentheses, keyboard input, and calculation history.

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SERP Pixel Ruler

SEO

Pixel-accurate Google SERP preview using Arial 18px/14px (desktop) and 16px/12.8px (mobile). Unicode-aware, shows exact truncation before publish.

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URL Encode/Decode

Developer

Encode and decode URLs with full URL parser showing protocol, host, path, query params, and fragment. Query string builder, bulk mode, encodeURI vs encodeURIComponent toggle, and live conversion.

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UUID Generator

Developer

Generate UUID v4 with bulk generation (1-100), format options (standard, uppercase, no dashes, Base64), UUID validator with version detection, click-to-copy, download as TXT, and generation history.

Open reviewed tool

Video Compressor

Image

Compress short videos locally by lowering width, frame rate, and bitrate, then export a smaller WebM copy for sharing or upload forms.

Open reviewed tool

Video Cutter

Productivity

Cut a short section from MP4, WebM, or MOV in the browser, preview the range, and export a trimmed WebM copy without uploading the file.

Open reviewed tool

Video Trimmer

Productivity

Trim a video to an exact start and end point with local preview, duration checks, and browser-based WebM export.

Open reviewed tool

Start using FastTool today

Pick a job, open the right utility, and keep the workflow moving. No signup needed.

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