Audio Trimmer: Cut a Clip From Any MP3, With Fades
This audio trimmer works in three steps: drop in an MP3, WAV or M4A, drag across the waveform to select a stretch (start and end to the millisecond), and choose whether to keep that stretch or delete it. Add a fade in and out and some silence at either end if you need it, preview, and export MP3 or WAV. It's built for pulling a preview or a trailer out of a dubbed episode, or removing a fluffed line from the middle. Files are processed in your browser and never uploaded.
- Millisecond selection
- Keep or delete a stretch
- Fades + padding
- Nothing uploaded
Updated Nov 6, 2026Fact-checked Nov 6, 2026
Audio trimmer
ON DEVICEAudio trimmer: select a stretch, listen, export
Drop in the audio and drag a selection on the waveform, or type the start and end times. Choose Keep it, cut the rest or Delete it, add fades, preview, then download.
How to trim audio online in four steps
The audio trimmer needs no install and works in desktop and phone browsers.
- 01
Drop in the audio
MP3, WAV, M4A and anything else your browser decodes. One file can be up to 200 MB and 60 minutes; phone browsers get half the size limit.
- 02
Select a stretch
Drag across the waveform or type the start and end times, to the millisecond; buttons beside each time nudge it by ±0.01 or ±0.1 seconds. Zoom in first and put each cut in the dip between two words, where it's least likely to clip one.
- 03
Keep it, or delete it
Keep it, cut the rest is the classic mp3 cutter move: only the selection survives. Delete it removes the selection and joins what's before and after, which is how you lose a fluffed line or a cough; each side of the join gets a 5-millisecond fade so there's no click.
- 04
Fades, padding, export
Fade the start and end of the result, add a little silence at either end if needed, preview, and export MP3 or WAV.
Does trimming an MP3 lower its quality?
With this audio trimmer, it depends on what you export.
This tool decodes the whole file to samples, cuts, joins and fades at the sample level, then encodes the result. Export WAV (16-bit) and the trimmed part matches the decoded original with no further loss. Export MP3 and it goes through another lossy encode; if the original was already an MP3, that's a second generation.
| Export | Quality | Good for |
|---|---|---|
| WAV | No further loss | Clips you'll edit, mix or stretch again |
| MP3 at the original bitrate or higher | One more lossy encode, small loss | Publishing or sending a preview |
| MP3 below the original bitrate | More noticeable loss | Only when file size really matters |
Why it can cut to the millisecond
MP3 stores audio in frames of 1,152 samples, about 26 milliseconds at 44.1 kHz. A 'lossless' MP3 cutter that doesn't re-encode can only cut on frame boundaries, so the cut lands slightly off where you asked. This tool cuts the decoded samples instead, and 1 millisecond is about 44 samples at 44.1 kHz, so the cut lands exactly where you put it. The price is the one re-encode described above.
How long should a fade be? Start with what it fixes
There's no standard fade length. Here is what fades actually do; how long yours should be depends on the clip and your ears.
Stopping clicks: a few milliseconds
Sound is a waveform swinging above and below zero. Cut where it isn't at zero and playback jumps from a value straight to silence, which you hear as a click. A very short fade at the cut lets the level ramp from zero and the step disappears. For that job a few to a few tens of milliseconds is enough, and nobody hears it as a fade. Fades in this tool start at 0 and can be set in steps of 0.01 seconds, so 0.01–0.05 does the anti-click job.
Transitions: hundreds of milliseconds to seconds
Cutting music for an intro or ending a trailer calls for a fade you can hear, and then it's a creative choice that follows the rhythm: a long musical phrase can fade slowly, a dialogue clip usually wants something shorter. Fades in this tool are linear: the level moves from zero to full, or full to zero, at a steady rate.
Two traps with dialogue clips
- A long fade-in eats the first consonant. Let the fade happen in the bit of silence before the word, not on top of it.
- Don't fade out over the tail. A line often has a trailing sound and a breath after the last word; start the fade after them and the ending won't feel chopped.
What padding with silence is for
Some players fade audio in briefly when playback starts, and with no silence at the top the first word can get swallowed. That's why dubs exported from the AI Drama Voice workshop always have 0.35 seconds before the first line. A clip you trim to play on its own benefits from a little silence at the start for the same reason.
Four everyday jobs for an audio trimmer
Previews and trailers
Pull the most gripping clash out of a dubbed episode and make it a preview or trailer a few dozen seconds long. The samples on this site's theater page run 38 to 40 seconds each: short enough to finish, long enough to hold a complete clash.
Casting clips
When you show a client or your team the cast, one representative line per voice side by side is easier to compare than a whole episode. You can hear the voices themselves in the voice library.
Removing a fluffed or extra line
The take that went wrong and got repeated, a cough, a throat clear: select it and delete it, and the two sides join up. If what you need to remove is lots of pauses, remove silence from audio does it in one go.
Trim several, then join them
To put several trimmed clips in order as one reel, use MP3 merge; to cut a whole episode into lines, use split audio by subtitles.
Five tips before you cut audio online
Zoom in before you cut
In any audio trimmer, zoom into the waveform and place the cut in the dip between words; it's far more accurate than dragging across the full view.
Check the join when you delete
Deleting a stretch butts the two sides together. If their level or background sound differs a lot, the join will be obvious, so select between two quiet spots when you can.
Your original is untouched
The export is a new file; the original on your computer isn't changed. When you work in several passes, save each step so you can go back.
WAV if there's more to do
If the clip will be stretched or mixed next, export WAV and make the MP3 only at the very end.
Smaller files on phones
Phone browsers have less memory, so the per-file limit is half the desktop one, 100 MB; very long recordings are safer on a computer.
Frequently asked questions
Drop the MP3 into this audio trimmer, drag across the part you want (or type the start and end), choose Keep it, cut the rest, add fades and export. It all happens in your browser with nothing to install.
Not if you export WAV. Exporting MP3 adds another lossy encode, a second generation if the original was MP3; choosing a bitrate at or above the original keeps the loss small. For clips you'll keep working on, save WAV first.
It depends on the job; there's no standard. To stop a click at the cut, a few to a few tens of milliseconds is enough and inaudible as a fade. As an intro or outro transition, hundreds of milliseconds to a few seconds, following the music. With dialogue, keep the fade-in off the first word.
Yes. Select it, switch to Delete it, and the tool joins the parts before and after, with a 5-millisecond fade on each side of the join to prevent a click. It suits a fluffed line, a cough or a burst of noise; for lots of pauses, use remove silence from audio.
Yes, the audio trimmer runs in phone browsers. Phones have less memory, so the per-file limit drops to 100 MB, with the same 60-minute length limit; very long recordings are better trimmed on a computer.
No. Decoding, trimming and encoding all run locally in your browser, so the file never leaves your device, and there's no sign-in and no credits. More audio tools are on the free tools page.
A trailer starts with a finished episode Cut the best forty seconds.
Paste a script and AI casts it and dubs every line with emotion, then exports an MP3 + SRT. Cast analysis is free.
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