Audio Trimmer
Cut a clip out of an audio file by dragging across its waveform, add fades, and download it as a WAV. Nothing is uploaded.
How to use
- Drop an audio file onto the box, or click it to pick one.
- Drag across the waveform to mark the part you want to keep.
- Press Play selection to hear it, and fine-tune the start and end boxes if needed.
- Set a fade in or fade out in milliseconds if the cut is abrupt.
- Press Trim, then download the WAV.
About this tool
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Most of the time you do not need an audio editor — you need thirty seconds out of the middle of a file. Drop the file here and its waveform appears; drag across the part you want and the selection is marked. Play it back before committing, nudge the start and end to the hundredth of a second if the drag was close but not exact, and add a fade in or out so the cut does not begin or end on a click. The result downloads as a WAV. Anything your browser can play can be opened here — MP3, WAV, M4A, OGG, FLAC — and where the file states its own sample rate, it is decoded at that rate rather than resampled to whatever this device happens to run at. The whole thing happens inside the page: the file is never uploaded, which matters for a voice memo, an interview recording or anything else you would rather not hand to a website.
Frequently asked questions
Is my audio uploaded anywhere?
No. The file is decoded, cut and encoded entirely inside your browser tab. Nothing is sent to a server, and closing the tab leaves no copy behind.
Why is the output a WAV, and why is it so much bigger than my MP3?
WAV is uncompressed, so a minute of stereo audio is about 10 MB regardless of what the source was. Browsers can decode MP3 but cannot encode it, so re-compressing would mean shipping an encoder — and every trim would then lose quality on top of the loss the original already has. Cutting to WAV keeps exactly what was in the file.
Which formats can I open?
Whatever your browser can play, which in practice means MP3, WAV, M4A/AAC, OGG and FLAC. If a file will not open, the browser has no decoder for it — the format is the limit, not the tool.
Does trimming change the sample rate?
Not when the file says what its rate is. WAV, FLAC and MP3 carry it in their header, so the audio is decoded at that exact rate and written back unchanged. For other formats the browser decodes at the device's own audio rate, which may differ from the source; the rate actually used is shown next to the file name.
What do the fades do?
They ramp the volume up at the start and down at the end, over the number of milliseconds you set. Cutting mid-waveform otherwise starts and stops on a jump in the signal, which is audible as a click. If the two fades are longer than the selection they are scaled to meet in the middle rather than fighting each other.
Can I cut out the middle and join the two ends?
Not in one pass — this keeps one continuous selection. Export the part before and the part after separately, then join them in an editor.
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