Audio Trimmer
Trim silence and unwanted material from the beginning and end of a recording, with the waveform in view the whole time.
Convert with this tool
or choose a file from your device — it is processed in this tab and never uploaded
Accepted: MP3, WAV, FLAC, M4A/AAC, OGG, Opus, video audio tracks
Files stay on your device. There is no upload, no queue and no watermark, so a conversion works even with the network switched off after the page has loaded.
Supported formats & processing
| Accepted input | MP3, WAV, FLAC, M4A/AAC, OGG, Opus, video audio tracks |
|---|---|
| Produced output | MP3, WAV, FLAC or M4A with the trimmed audio |
| Processing | Web Audio API + canvas + native JavaScript encoders |
| Upload required | No — the file is read locally and never transmitted |
How to use this tool
- Add the recordingThe waveform shows immediately where the audio actually starts.
- Move the start past the silenceFind the first real transient on the waveform and set the start just before it.
- Set the end pointTrim the tail so the file finishes where the content finishes.
- Enable short fadesTen to fifty milliseconds is enough to keep the edges clean.
- Convert and downloadThe result card reports the new duration next to the original.
About this tool
A trim is a cut with a purpose: remove the dead air before the first word, chop the five seconds of room tone after the last note, or shorten a long file to the part that matters. Where a cutter extracts a section from the middle, a trim shapes the edges.
The workflow is identical — add the file, read the waveform, set the boundaries — but the defaults suit edge work: start at zero, end at the first thirty seconds, and short fades enabled. If you are cleaning up a batch of voice recordings, this is the page you want.
Features
- Waveform view so silence is obvious at a glance
- Start and end points adjustable to a tenth of a second
- Fade in and fade out to keep trimmed edges click-free
- Original duration and new duration reported side by side
- Works on every format the browser can decode
- Useful for batching voice memos, lectures and field recordings
Frequently asked questions
Can the tool detect silence automatically?
It draws the waveform, which makes silence visually obvious — the bars flatten out. Automatic silence detection with a threshold is a desktop-editor feature; here you place the cut yourself, which is more reliable for material with background noise.
Will trimming change the pitch or speed?
No. Trimming removes whole samples from the start and end; everything that remains plays at exactly the original rate.
Can I trim several files to the same length?
Run them one at a time. Each keeps its own duration in the result card, so you can compare and adjust.
What if the file starts with a fade-in I want to keep?
Zoom into the waveform, set the start at the very beginning and use the fade-in field instead — that gives a controlled fade rather than a truncated one.