TRIM

Manual

1. What TRIM does

   TRIM shows the waveform of your audio file so you can pick exactly the range you want and export it as a new file.

   It's useful for removing dead air at the start or end, or for cutting a short clip — a ringtone, a preview snippet, anything. Processing happens entirely in your browser; the file is never uploaded.

2. How to use it (range mode)

   Drag the handles on the waveform, or type the start/end fields directly in mm:ss.mmm format (e.g. 01:05.234). Use the "Preview" button to play back just the selected range, then export it with "Export this range" once you're happy with it.

3. How to use it (remove silence mode)

   Any stretch quieter than the threshold (-60 / -50 / -40dB) lasting at least the minimum silence length (0.5 / 1 / 2 seconds) is cut automatically. Adjust the threshold to match the noise floor of your recording. The Readout compares the length before and after.

4. Supported formats and export method

   WAV / FLAC / AIFF can be cut sample-accurately, so they're exported losslessly (stream copy). Compressed formats like MP3 / AAC (M4A) / OGG can only be cut on compression-frame boundaries, so they're re-encoded in the same format. When re-encoding happens, it's shown in the Readout.

   Format	Range trim	Remove-silence mode
   WAV / FLAC / AIFF	Lossless (stream copy)	Re-encoded (a filter is applied)
   MP3 / AAC (M4A) / OGG	Re-encoded in the same format	Re-encoded (a filter is applied)

5. Use case: a short clip for social media or chat

   When you just need one moment from a long recording or a stream archive, drag the waveform handles to the start and end you want and export just that part — great for a ringtone or a short highlight from a voice memo.

6. Use case: removing dead air from a recording

   Voice recorder audio often has a stretch of silence before someone starts talking and after they finish. Set a threshold and minimum silence length in remove-silence mode and TRIM strips those silent stretches automatically, wherever they occur in the file.

7. How it works: in-browser processing and privacy

   Waveform display, range selection and export all happen entirely in your browser (a WebAssembly build of ffmpeg). Nothing is uploaded to a server; the result downloads straight to your device.

8. Limits and troubleshooting

   Processing runs in your device's memory, so a very large file (as a rough guide, over 1GB) can fail due to low memory. For long recordings, consider splitting the file into rough chunks before loading it.

9. FAQ

   Did the exported file's quality change?

   Not for a lossless range export (WAV/FLAC/AIFF). Remove-silence mode, and range trims on compressed formats, go through a decode → re-encode pass because a filter is applied.

   Remove silence cut more (or less) than I expected.

   The combination of threshold and minimum silence length changes what counts as "silence". For noisy recordings, try a looser threshold (e.g. -40dB) to catch more.

   Which file formats are supported?

   WAV, MP3, FLAC, AAC, M4A, OGG and most other common audio formats that ffmpeg can read.

   Does it work with large files?

   Processing runs entirely in your device's memory, so as a rough guide, files over 1GB are more likely to fail. Splitting a long recording first is a good workaround.

   Does it overwrite the original file?

   No. The export is created as a new file inside your browser; the original file is never modified until you choose to download the result.