Free audio trimmer, no upload.
A free audio trimmer that cuts audio online without ever uploading it. Drag two handles across the waveform to trim an MP3 down to the part that matters — or cut a chunk out of the middle and close the gap. Everything happens on your own device, so there is no queue, no sign-up and no size limit.
Add the audio you want to trim
Drag a file here, or press the button. Videos work too — the sound is taken out and the picture ignored. Your file stays on this device the whole time.
MP3 · M4A · WAV · FLAC · Ogg · Opus · MP4 · MOV — even old AMR and WMA files. You can also paste one from the clipboard.
Your privacy — live proof, not a promise
- Files uploaded
- 0 bytes
- Processing
- Not started yet
- Your files
- Stay in this browser tab — gone when it closes
- Converter engine
- Not downloaded — only fetched if a format needs it
One download, and it isn’t your audio
Converting to MP3 or WAV needs no download at all. Less common formats use a built-in converter engine (32.5 MB) that comes from this site — not from some other company — downloads once, and is then saved in your browser. Your audio is never part of that download: the engine comes to your files, your files don’t go to it.
Don’t take our word for it: open your browser’s DevTools, watch the Network tab, then convert a file. You’ll see nothing carrying your audio — because this page has no upload feature at all. There is nowhere for your file to go.
Scope note, so this stays exact: the claim is about your files — they never leave this device. The site around it is not claim-free. It loads Vercel Analytics for aggregate page traffic, plus Google Analytics and Ads tags if you accept the consent prompt. Those measure page visits and store-link clicks. They never receive your audio, because nothing does. Full privacy policy.
Converted files are never stored by this page — they exist only in this tab until you download them.
Most trims exist because a recorder kept going.
BlackBox splits the day into tidy hourly files with a waveform you can scrub, so finding the two minutes that mattered does not start with an eight-hour file. Free on iPhone and Android.
Honest limits of this page
- ·Trimming an MP3 re-encodes it. Take the WAV if you plan to edit further.
- ·One file at a time — this is a trimmer, not a batch job.
- ·Close the tab and the file is gone. There is no library and no cloud copy.
- ·Very long recordings are limited by your device's memory, not by us.
Need it smaller, not shorter?
If the problem is an attachment limit rather than length, the free audio compressor solves backwards from a target size and keeps the whole recording.
Cutting out the quiet bits?
If what you actually want gone is dead air rather than one section, the silence remover finds every pause for you and cuts them in one pass.
How the free audio trimmer works without uploading anything
Other sites make you send them your file, do the work on their computers, and send it back. Your browser can do the same work itself — and your file is already here. That is the whole trick.
Drop the file in
Drag an audio file onto the box, or press the button and pick one. Video works too — we take the sound out and leave the picture. Your browser opens it with the same decoder it uses to play sound on any site, and it stays on your device.
Drag the handles
The recording is drawn as a waveform. Drag the two orange handles to the part you want. If you know the exact moment, type it in the boxes instead — 1:23.5 works, and so does 83.5.
Keep it, or cut it out
Two buttons, two meanings of 'trim'. Keep this part throws away the ends. Cut this part out removes the selection and closes the gap, which is how you delete a cough or a name from the middle.
Listen, then download
Press Preview to hear the result before committing. Download as MP3 — at the same quality the original was already using — or as WAV if this is one step of a longer edit.
Trimming is not the same as cutting out
Most tools only do the first one. Keeping a selection throws away everything outside it — that is trimming the ends. Cutting a selection out removes what you selected and joins what is left, which is what you need when the problem is in the middle: a name, a cough, thirty seconds of someone else's phone call. Both are one button here.
Why there are no clicks at the joins
A cut puts two samples next to each other that were never neighbours. If they are at different levels the jump is a click, and a file full of them sounds broken. Every cut edge here gets a six-millisecond fade — too short to hear as a fade, long enough that the click never happens.
About re-encoding
Trimming an MP3 means decoding it, cutting, and encoding again, which loses a little detail the same way photocopying a photocopy does. We keep the loss as small as possible by matching the original's bitrate rather than defaulting to a bigger one. If this is one step in a longer edit, take the WAV — from that point nothing is lost at all.
What people use it for
Cut a voice memo down to the useful bit
Thirty seconds of pocket noise before someone starts talking, and two minutes of nothing after. Drag both handles in and send the ten seconds that mattered.
Remove a name or a number from a recording
Select the passage, cut it out, and the gap closes cleanly. Useful before sharing a recording with anyone who does not need that part of it.
Make a ringtone or a clip
Pick the section, export MP3, done. No sign-up wall, and no watermark burned into the audio.
Split one recording into pieces
Trim, download, then move the handles and download again. The original in the page is untouched between exports.
Cutting the file down because it is too big to send? The compressor solves that directly, and keeps the whole recording.
Free audio trimmer — your questions, answered
How do I cut audio online without uploading it?+
Open this page and drop the file in. Your browser decodes it locally, draws the waveform, and does the cut in the tab you are already looking at. There is no upload step to skip — this feature has no server behind it, so the file has nowhere to go even in principle.
Can I cut a section out of the middle instead of trimming the ends?+
Yes. Select the part you want gone and press Cut this part out. The audio either side is joined and the gap closes, with a short fade at the seam so there is no click. Most online trimmers only offer the opposite operation.
Is this audio trimmer really free, with no watermark?+
Yes — no account, no daily limit, no watermark and no paid tier hiding the export button. The trimming happens on your device, so an extra file costs us nothing and there is nothing to meter.
What is the maximum file size I can trim?+
We set no limit. The real one is your device's memory, because the whole file is held in the tab. A laptop copes with multi-hour recordings; a phone is happier under an hour. The page warns you before starting if a file looks heavy.
Does trimming an MP3 reduce its quality?+
A little, because the file has to be decoded and re-encoded. We reduce that by matching the original's bitrate instead of defaulting upwards. If you need zero further loss, export WAV instead — it is about ten times larger and keeps everything.
Can I trim audio from a video file?+
Yes. Drop in an MP4 or MOV and the sound is taken out of it; the picture is ignored, not uploaded, not altered. You get an audio file back containing just the section you selected.
How precise can the cut be?+
To the sample. The handles snap to whatever you drag them to, and the timecode boxes accept a tenth of a second — type 1:23.5 or just 83.5. Nudge buttons move an edge by small steps when you need to get closer.
The rest of the audio toolkit
Also here: the audio converter, the compressor, the transcriber and the browser voice recorder. All free, all on your device.
Record your whole day, privately.
BlackBox is a 24/7 background voice recorder with scheduling, on-device transcription and local storage — about 14 MB an hour. Free on iPhone and Android.