Best use case
Use it when you need a fast browser workflow with clear input, visible output, and a concrete verification step.
FREE ONLINE TOOL
Audio Cutter Online
Trim MP3, WAV, OGG, or M4A locally with waveform handles, preview, WAV download, replay, and copyable JSON receipt.
No upload workflow
Waveform handles
Replay + JSON receipt
No signup
For quick audio cutsTrim a voice note, sample, podcast moment, or ringtone-length section without opening a DAW.
For private draftsPreview and export common audio files locally before uploading the result anywhere else.
For proof-based handoffCopy a receipt with source type, selected range, WAV output bytes, duration, sample rate, channels, and browser limits.
Audio Cutter Online Trim MP3, WAV, OGG, or M4A locally with waveform handles, preview, WAV download, replay, and copyable JSON receipt.
What this tool does
- visual waveform editor
- millisecond start and end controls
- selection preview before export
- WAV output from the selected range
- browser audio decoding where supported
- no FastTool application upload
- output replay and copyable JSON receipt
- clear unsupported-format message
PREMIUM TOOL STANDARD
What the Audio Cutter proves after export
It keeps the claim narrow: local waveform preview, selected range, WAV download, replayable output, output bytes, and a copyable receipt.
Proof before trust
Run a harmless sample first, inspect the waveform and preview, then trim, replay, and copy the receipt only after the output matches the job.
Privacy boundary
Prefer local or non-sensitive input. Keep passwords, private keys, regulated records, and client data out unless the page explicitly fits that use.
Do not use for
Do not use it as a substitute for expert review when the output affects money, safety, legal rights, medical choices, or production systems.
AI agent handoff JSON
{
"tool": "Audio Cutter Online",
"canonical_url": "https://fasttool.app/tools/audio-cutter/",
"category": "Productivity",
"best_for": "Use it when you need a short local audio trim with waveform preview, WAV download, replay proof, and a receipt.",
"input_boundary": "Start with sample or non-sensitive data. Do not paste secrets, regulated records, or irreversible production values unless the tool explicitly fits that use.",
"output_checks": [
"Confirm the replay preview matches the intended selected range.",
"Use the WAV download and copied receipt only after checking edge cases.",
"Keep the original input when the job involves files or production data."
],
"not_for": "Do not use it as a substitute for expert review when the output affects money, safety, legal rights, medical choices, or production systems.",
"agent_instruction": "If an AI agent uses this page, it should cite the canonical URL, describe the input it used, report the visible output, and state what remains unverified."
}
REVIEWED OUTPUT EVIDENCE
Sample input, expected output, and safe-use boundary
This page gives a concrete control input, an expected result, real browser limitations, and a not-for boundary before the visitor uses a real file.
Sample input
Audio: harmless 8 second WAV or MP3 clip. Start: 1.0s. End: 4.0s.
Expected output
Trimmed WAV should download, replay in the page, expose output bytes, selected range, duration, sample rate, channels, and copyable JSON receipt.
Proof checks
- Waveform, numeric fields, and preview all refer to the same selected range.
- Output duration, WAV format, replay preview, output bytes, sample rate, channels, and JSON receipt are explicit.
- Browser decode errors are shown clearly for unsupported codecs.
When not to use it
Not for forensic audio, music mastering, copyrighted extraction without rights, or confidential recordings on untrusted devices.
Privacy boundary: Standard processing is designed to happen in your browser tab. The page can still load normal site scripts such as consent, analytics, ads, and third-party libraries where needed, so do not use regulated or confidential media unless your own policy allows it.
COMMON QUESTIONS
Before you process a real file
How do I cut an audio file?
Choose an audio file, drag or type the start and end time, preview the selection, then download the trimmed WAV with replay and receipt proof.
Why is the output WAV?
The browser can reliably write WAV from decoded audio. MP3 output requires a separate encoder and is handled by the MP4 to MP3 tool.
Does it upload my audio?
Standard trimming happens in your browser tab without uploading to a FastTool application server.
Which files work best?
WAV and common MP3 files are most reliable. Very large or unusual codecs may fail to decode in the browser.
Methodology, sources, and limitations
FastTool media tools use standard browser APIs such as File, HTMLMediaElement, Canvas, Web Audio, MediaRecorder, and optional lazy-loaded open-source encoders. The site intentionally surfaces browser limits instead of claiming cloud-editor fidelity.