Audio Silence Remover
Detect and cut silent gaps from MP3, WAV, M4A or FLAC files using the ffmpeg silenceremove filter. Adjustable threshold and minimum gap length — perfect for tightening podcasts and voiceovers.
Quick answer: Detect and cut silent gaps from MP3, WAV, M4A or FLAC files using the ffmpeg silenceremove filter. Adjustable threshold and minimum gap length — perfect for tightening podcasts and voiceovers.
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Frequently asked questions
- What threshold should I pick?
- -40 dB is a good default for clean spoken-word recordings. Use -30 dB for noisy rooms (so background hum doesn't count as 'sound'). Drop to -50 dB only for studio-quiet recordings.
- What minimum length should I set?
- 0.5 s is standard — it cuts out long pauses and breath gaps without chopping natural cadence. Drop to 0.2 s to aggressively trim ums and pauses; raise to 1-2 s if you only want to cut very long silences.
- Will it cut quiet music or whispered dialogue?
- It can. Quiet music below your threshold will be treated as silence. For mixed material, a higher threshold (-50 dB) and longer minimum gap (1+ s) is safer.
- Is my audio uploaded?
- No. ffmpeg.wasm runs entirely in your browser. Nothing leaves your device.
- How much time can I expect to save?
- Spoken word with normal pauses: typically 15-30%. Aggressive editing (-30 dB threshold, 0.2 s minimum) on raw interview tape can hit 40-50%.
- Will it sound choppy?
- We leave a 0.1 s tail on each cut so the transitions feel natural. If it still sounds chopped, increase the minimum silence length so only obviously-too-long gaps are cut.
- What output formats are supported?
- MP3 (libmp3lame), WAV (PCM 16-bit), M4A (AAC) and FLAC (lossless).
- What's the maximum file size?
- 200 MB. That's about 3 hours of MP3 or 30 minutes of WAV.
- Can I keep the original duration but lower the silent parts?
- Not in this tool — we cut silence out completely. For a 'duck-and-keep' workflow, look for a desktop DAW like Reaper or Audition.
- Will it remove silence from the start and end too?
- Yes — leading and trailing silence are removed first, then internal gaps. You'll often save 1-3 s just from the start/end trim alone.