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Dictation, interviews and lecture recordings often consist substantially of pauses. This tool measures the level in short analysis windows and cuts out silent passages longer than the chosen minimum - shorter speech pauses stay untouched so the natural rhythm survives.
At every cut, 0.2 seconds of the silence is kept. The result never sounds chopped: word starts and ends keep their air, only the long emptiness in between disappears. Sensitivity decides what counts as silent: -30 dB removes quiet rustling too, -50 dB only near-absolute silence.
The analysis runs fully locally over the decoded stream - even for long recordings the memory footprint stays small, because discarded silent passages are never buffered. Nothing is uploaded.
Specifications
Specifications
Input formats
MP3, WAV, M4A, AAC, OGG, OPUS, FLAC
Auto-conversion
MP4
Output formats
WAV, M4A
Batch processing
No
Processing
Locally in your browser (WebCodecs)
File upload
None
In 3 steps
Drop the recording.
Choose the sensitivity and the minimum pause length.
Start and download the tightened file.
Limitations: Honest per-device length cap (desktop about 20 minutes, tablet 15, phone 10; more with plenty of memory) - longer files are clearly refused, never silently truncated. Detection is level-based (RMS in roughly 20-100 ms windows): constant loud noise (fans, traffic) does not count as silence - switch sensitivity to -30 dB in that case. With wide-dynamic-range music (such as classical recordings), quiet-but-intentional musical passages can get removed too at the standard sensitivity (-40 dB) - not true silence, but below the threshold; for music, pick the more careful -50 dB level if that matters to you. 0.2 s of silence is kept as padding at every cut.
Sensitivity levels compared
Sensitivity levels compared
Level
What gets removed
Strict (-30 dB)
removes quiet parts too
Standard (-40 dB)
suits normal recordings
Careful (-50 dB)
true silence only
FAQ
Are files uploaded?
No, analysis and cutting run entirely locally in the browser.
Does the result sound chopped?
No: short speech pauses are fully kept, and 0.2 seconds of silence remains as natural padding at every removed passage.
What counts as silence?
Anything under the chosen level threshold: -40 dB suits normal recordings, -30 dB removes very quiet parts too, -50 dB only near-absolute silence. With dynamic music, quiet passages without true silence count too if their level sits under the threshold.
Does it work with background noise?
With constant, clearly audible noise the level often sits above the threshold - choose the strict setting (-30 dB) then. It is not a noise reducer.
How much does the file shrink?
Depends on the material: dictation with long thinking pauses often loses a third or more of its length. Dense, continuously loud music (pop, rock) loses virtually nothing - a wide-dynamic-range recording like a classical nocturne, however, can shrink noticeably even at standard sensitivity, because its quiet passages fall under the -40 dB threshold.