Audio Trimmer

What this tool does

Audio Trimmer shows your recording as a waveform so you can drag across exactly the part you want. Keep that selection or cut it out and join the rest, add linear fades to avoid clicks, preview the result and download it as 16-bit, 24-bit or 32-bit float WAV.

Most recordings need a little surgery before they are useful: a voice memo that starts with five seconds of rustling, a song you want as a 30-second ringtone, a podcast take with a cough in the middle. Opening a full audio editor for that is overkill, and uploading private recordings to a website is not always acceptable.

This trimmer decodes the file with the Web Audio API built into your browser and draws its waveform, so you can see the quiet gaps and loud passages before you cut. Edits are sample-accurate: the start and end you set are converted to exact sample positions, not rounded to the nearest frame as video editors do. The result is written as an uncompressed RIFF WAV file on your device. No engine download is needed and nothing leaves your computer.

How to use Audio Trimmer

1. Drop an MP3, WAV, M4A, OGG, Opus or FLAC file (or a video whose sound you want) onto the upload area.
2. Drag across the waveform to select a range, or type Start and End in seconds and use the minus and plus buttons to nudge them by 0.1 s.
3. Choose Mode: Keep selection to save only that part, or Remove selection to delete it and join what is left.
4. Set Fade in and Fade out, or click a preset such as Song ending fade or Click-free edges.
5. Click Play selection to check the range, then Play result to hear the finished edit.
6. Pick a WAV bit depth and click Download WAV.

Tips for better results

• Look for the flat, thin parts of the waveform: they are silence and make the cleanest cut points.
• Even a 50 ms fade at each edge removes the small click you hear when a cut lands in the middle of a wave.
• For a phone ringtone keep 20 to 30 seconds; iPhone ringtones are limited to 40 seconds.
• Choose 16-bit for normal listening and sharing, and 24-bit if the file goes back into a music project for further processing.

Common use cases

• Removing the silence and handling noise at the start and end of a voice memo.
• Cutting a chorus out of a song to use as an alarm or ringtone.
• Deleting a mistake or interruption from the middle of a spoken recording with Remove selection.
• Preparing short, tidy samples and sound effects for a video or presentation.

Common mistakes to avoid

• Downloading as WAV and expecting an MP3-sized file: uncompressed audio is roughly 10 MB per minute in stereo at 16-bit, so convert it afterwards if size matters.
• Setting fades longer than half of the clip; the tool caps them so the fade in and fade out never overlap.
• Selecting less than 10 milliseconds by accident with a single click, which the tool treats as no selection.