# Bleep or Mute Regions of an Audio File Censor an audio file in your browser — bleep, mute, or duck the exact time regions you pick. Set a tone frequency and output format. Nothing is uploaded, free. ## Run it - **CLI:** `gizza tool audio-bleep-censor 'url=https://example.com/input' 'regions=1.5-2.0, 0:07-0:08.5' 'mode=bleep' 'tone_hz=1000' 'format=mp3'` - **Web:** https://gizza.ai/tools/audio-bleep-censor/ - **Agents:** machine-readable descriptor (parameters JSON Schema) at https://gizza.ai/tools/audio-bleep-censor/tool.json ## Inputs - `file` — Audio _(file; accept: audio/*)_ - `regions` — Regions to censor (start-end) _(field)_ - `mode` — Censor mode _(field)_ - `tone_hz` — Bleep tone (Hz) _(field)_ - `format` — Output format _(field)_ ## Output - Censored audio (audio) ## Query parameters Open the tool pre-filled and auto-run via URL: - `regions` — Regions to censor (start-end) - `mode` — Censor mode - `tone_hz` — Bleep tone (Hz) - `format` — Output format - `url` — fetch the input file from a public URL (CORS-permitting) Example: `https://gizza.ai/tools/audio-bleep-censor/?url=https://example.com/input®ions=1.5-2.0%2C%200%3A07-0%3A08.5&mode=bleep&tone_hz=1000&format=mp3` --- ## 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. ## FAQ
How do I write the regions? As a comma-separated list of `start-end` pairs, e.g. `1.5-2.0, 0:07-0:08.5`. Each time is either seconds (`12.4`) or a `mm:ss` / `hh:mm:ss` timestamp (`1:05`, `1:02:03.5`). The end of each pair must be later than its start.
What's the difference between bleep, mute, and duck? **Bleep** mixes a tone over the region so a word is covered by a beep. **Mute** silences the region completely. **Duck** lowers the region to roughly a tenth of its volume, which keeps a faint trace of the audio so the edit is less abrupt. Bleep is the default.
Can I change the bleep tone? Yes — the **Bleep tone** control sets the frequency in Hz. `1000` is the classic TV/radio bleep; go higher (say `1500`) for a sharper beep or lower for a softer one. The tone control only affects **Bleep** mode.
Does it detect the swear words for me? No. This tool censors the exact time regions you give it — it does not transcribe the audio or find profanity automatically. Note the times of the parts you want to hide (a media player's clock works well) and list them.
Is my audio uploaded anywhere? No. The page downloads an ffmpeg WebAssembly build once and then processes your file locally in the browser tab — the audio never leaves your device.
## Related tools - [Trim Leading & Trailing Silence](https://gizza.ai/tools/audio-edge-silence-trimmer/): Cut dead air at the start and end of a recording while leaving middle pauses untouched — set a threshold and edge pad. Runs locally, nothing uploaded. - [Fit Audio to an Exact Length](https://gizza.ai/tools/audio-fit-to-length/): Make any audio file an exact number of seconds — pad it with silence when it's short or trim it when it's long. Runs in your browser, nothing uploaded. - [Shorten Long Audio Pauses](https://gizza.ai/tools/audio-pause-shortener/): Tighten speech pacing by shortening long silent gaps to a natural pause length in your browser. Nothing is uploaded, free. - [Remove Silence from Audio](https://gizza.ai/tools/audio-silence-remove/): Strip dead air and long pauses out of any recording right in your browser — set a silence threshold and minimum gap. Runs locally, nothing is uploaded, free. - [Blur or Pixelate a Region in a Video](https://gizza.ai/tools/video-blur-region/): Blur or pixelate a fixed rectangle — a license plate, name tag or logo — on every frame of a video, right in your browser. Nothing is uploaded, runs locally, free.