Audio Trimmer
Cut a section out of any audio file right in your browser. Nothing is uploaded.
Drop an audio file here or click to browse
MP3, WAV, M4A, OGG, FLAC — decoded locally
How to Use
- 1. Upload an MP3, WAV, M4A, or OGG file.
- 2. Set the start and end of the section you want to keep.
- 3. Press Play selection to check it sounds right.
- 4. Optionally add a fade, then download the trimmed WAV.
About Trimming Audio in the Browser
Your file is decoded into raw samples with the Web Audio API, which is the same engine browsers use to play audio. The waveform you see is a peak summary of those samples, and the region you select is copied out sample for sample — so the trimmed result is bit-identical to that part of the source.
The export is WAV for a specific reason: browsers ship an MP3 decoder but no encoder. Producing an MP3 would mean downloading a separate encoder library of several megabytes, so a lossless WAV is the honest trade. If you need MP3, run the WAV through any converter afterwards.
The optional fades apply a 50-millisecond ramp at each edge. That is almost inaudible as a fade, but it removes the click you otherwise get when a cut lands mid-waveform rather than at a zero crossing.
You might also like our Text to Speech and Speed Reading Timer.
Frequently Asked Questions
Why is the output a WAV file and not MP3?
Browsers can decode MP3 but cannot encode it — there is no built-in MP3 encoder, and shipping one would mean loading a large extra library. WAV is lossless and plays everywhere, so the trimmed result keeps the exact quality of the source region.
Which formats can I open?
Anything your browser can decode: MP3, WAV, M4A/AAC, OGG, FLAC, and WebM audio. The file is decoded locally, so support follows your browser rather than a server.
Does trimming reduce the audio quality?
No. The selected region is copied sample for sample at the original sample rate, so it is identical to that part of the source. Converting a compressed MP3 to WAV does not restore lost detail, but it does not lose any more either.
Is my audio uploaded anywhere?
No. Decoding, trimming, and encoding all happen in your browser using the Web Audio API. The file never leaves your device.
Is there a file size limit?
There is no hard limit, but the whole file is decoded into memory as raw samples, which is much larger than the compressed original. Very long recordings may be slow on low-memory devices.
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