Audio Trimmer

Trim and cut audio files easily

Click to upload an audio file

About Audio Trimmer

Audio Trimmer cuts a section out of an audio file using ffmpeg.wasm's fast stream-copy trimming, entirely in your browser — nothing is uploaded to a server. Set start and end points with the sliders to keep only the section you need.

How to use Audio Trimmer

1Click the upload area and select an audio file.
2Use the Start and End sliders to set the section you want to keep.
3Click "Trim Audio" to process it locally.
4Preview and download the trimmed result.

Frequently Asked Questions

Is Audio Trimmer free to use?

Yes, it's completely free with no signup required.

What audio formats can I trim?

Any format ffmpeg.wasm can decode for input.

Will the output always play correctly as MP3?

The tool uses fast stream-copy trimming (no re-encoding) and always names the result with an .mp3 extension — this works cleanly when your source is already MP3. Trimming other formats (WAV, FLAC, etc.) this way can occasionally produce a file whose extension doesn't match its actual encoding.

Is my file uploaded anywhere?

No. Everything happens locally via ffmpeg.wasm — your file is never uploaded to a server.

Tips & Tricks

✓For the most reliable results, trim files that are already in MP3 format.
✓Because trimming uses stream copy (not re-encoding), start/end points may snap slightly rather than cutting at the exact sample — fine for most uses, but not frame-accurate.
✓Preview both edges of your selection before trimming to make sure you're not cutting off audio you want to keep.
✓The first trim after loading the page takes longer since the ffmpeg.wasm engine needs to download.