Bleep or Mute Regions of an Audio File

Bleep, mute, or duck words in audio — in your browser

Pick an audio file, list the time regions you want to censor, and each one is replaced right in your browser with ffmpeg — no upload. Use bleep for the classic tone over a swear word, mute to drop a region to silence, or duck to lower it just enough that something was clearly there. Everything outside the regions you list is left completely untouched.

Regions are a comma-separated list of start-end ranges. Each time can be plain seconds (1.5) or a timestamp (0:07, 1:02:03.5), so you can copy times straight off a player's clock.

Worked example

You have a podcast.mp3 and someone swears at 12.4–12.9 seconds and again at 1 minute 5 seconds. Set Regions to 12.4-12.9, 1:05-1:06.5, leave Mode on Bleep and the tone at 1000 Hz, and download podcast-censored.mp3 — both spots now carry a classic 1 kHz bleep and the rest of the episode is identical. Prefer silence? Switch Mode to Mute. Want the timing to still read as speech without the words being intelligible? Use Duck.

Picking a mode

• Bleep — the expected TV/radio censor: a steady tone covers the word. Raise the tone for a sharper beep, lower it for a softer one.
• Mute — total silence over the region; cleanest when you don't want any sound to draw attention.
• Duck — lowers the region to about a tenth of its volume, leaving a faint trace so the edit doesn't feel like a dropout.

Limits and edge cases

• Input files up to 16 MiB; any format ffmpeg can decode works.
• List up to 50 regions; each must be written start-end with the end after the start.
• The bleep tone frequency is 100–8000 Hz (default 1000).
• Overlapping or out-of-order regions are fine — each range is applied on its own; a region past the end of the track simply does nothing.
• Bleep output is normalized to 44.1 kHz stereo before mixing the tone; mute/duck keep the source layout. Output is always re-encoded (mp3/ogg at 192 kbps, wav/flac lossless, m4a AAC) and embedded album art is dropped.

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