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Audio Trimmer

Cut a section out of an audio file, with optional fade in and out.

To trim audio, add your file and enter the start and end times. The selected section is extracted and encoded to MP3, with an optional one-second fade at each end so the clip does not begin or finish with an abrupt click.

Runs in your browser
Engine
FFmpeg compiled to WebAssembly
First run
Downloads ~30 MB of FFmpeg core, then cached
Upload
None — the file never leaves your device
Privacy
Runs entirely in your browser — nothing is uploaded
Cost
Free, unlimited, no sign-up

Frequently asked questions

Why is the first run slow?

The FFmpeg WebAssembly core is about 30 MB and downloads once per session. After that it stays in the browser cache, and subsequent conversions start immediately.

Is my video uploaded anywhere?

No. FFmpeg runs inside your browser as WebAssembly, so the file is read from disk into memory and never sent to a server. That is also why there is no file size limit beyond your available RAM.

Why is it slower than desktop FFmpeg?

WebAssembly runs single-threaded here and cannot use your GPU, so encoding is typically several times slower than a native build. For a short clip that is fine; for a feature-length film, use desktop FFmpeg.

How to use the audio trimmer

  1. 1Select your audio file — the file stays on your device and is never uploaded.
  2. 2Enter or paste your start.
  3. 3Enter or paste your end.
  4. 4Turn "Fade in and out (1 second)" on or off as needed.
  5. 5Press Run, then download the result when it is ready.

Embed this tool

Put the working audio trimmer on your own site. It runs in your visitors' browsers exactly as it does here — free, no account, nothing uploaded.

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