01
Video Compressor
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Audio Silence Trimmer
Finds the silence at the start and end of an audio file and trims it, keeping a little padding so nothing clicks.
Video & Audio
Nothing uploaded
No sign-up
Free, unlimited
Drop an audio filetrimmed in this page — nothing is uploaded
Add a file to begin.
In short
Trimming silence needs a threshold and a padding, and the padding is not a nicety. Cutting exactly at the first sample above the threshold clips the attack off the first word or note and leaves an audible click where the waveform jumps from zero — 50 milliseconds either side avoids both. The threshold should be set by what the recording's noise floor actually is: a room with hiss or mains hum sitting above the threshold will appear to have no silence at all, which is why a file that seems untrimmable usually just needs the threshold lowered.
How to use the Audio Silence Trimmer
- Drop the audio file in.
- Lower the threshold if nothing is trimmed.
- Keep 30 to 100 ms of padding.
- Download the WAV.
About the Audio Silence Trimmer
The Audio Silence Trimmer finds the silence at the start and end of an audio file and trims it, keeping a little padding so nothing clicks. It runs as plain JavaScript inside the page, which means there is no upload step, no queue and no size limit imposed by a server — the only limit is your own device.
What people use it for
- Tidying the ends of a voice recording.
- Removing the count-in before a take.
- Preparing a sample so it triggers instantly.
Details
| Trims | The start and end only |
|---|---|
| Padding | Kept either side, to avoid clicks |
| Output | 16-bit WAV — the only format a browser writes losslessly |
| Threshold | Must sit above the recording's noise floor |
The padding default of 50 ms is chosen to be inaudible and enough. Zero padding produces a click on almost every recording, because the file starts mid-waveform rather than at a zero crossing.
Where this tool stops
Ends only, and the output is uncompressed WAV — which will be considerably larger than an MP3 input.
Frequently asked questions
Nothing was trimmed. Why?
The noise floor is above your threshold. Room tone, hiss and mains hum are all real signal, so a recording with a floor at −45 dB has nothing below a −50 dB threshold. Lower it until the figures look right — −60 or −65 is normal for a quiet room.
Why is the output a WAV?
Because it is the only format a browser can write losslessly. Re-encoding to MP3 or AAC would need an encoder this page deliberately does not ship, and would add a generation of lossy compression for a job that only removes silence.
Can it remove silence in the middle?
No — this trims the ends only. Removing internal gaps is a different operation with different judgement behind it: how long a pause has to be before it counts, and how much to leave, are editorial decisions rather than a threshold.
Do I need an account to use the Audio Silence Trimmer?
There is no cost and no cap. The Audio Silence Trimmer is not a demo of a paid product, so nothing is held back or watermarked.
Can you see what I put into this page?
No. The Audio Silence Trimmer runs entirely in your browser using JavaScript. Nothing is transmitted, logged or stored, which you can verify yourself in the Network tab of your browser's developer tools.
Who is the Audio Silence Trimmer for?
Typical uses: tidying the ends of a voice recording. Removing the count-in before a take. Preparing a sample so it triggers instantly. It is built for exactly those cases rather than being a general-purpose tool with this bolted on.
Where does the Audio Silence Trimmer stop being reliable?
Ends only, and the output is uncompressed WAV — which will be considerably larger than an MP3 input. Knowing where a tool stops being trustworthy matters more than the cases where it works.
What are the key numbers for the Audio Silence Trimmer?
Trims is The start and end only. Padding is Kept either side, to avoid clicks. Output is 16-bit WAV — the only format a browser writes losslessly. These are printed on the page itself, so you do not have to take them on trust.
How large a file can I use?
There is no limit set by us, because your file is never uploaded — the only ceiling is the memory your own browser will give the tab. Very large files simply take longer to process, and a phone will give up sooner than a desktop.
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