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Voice Anonymizer
Change the pitch and tone of a voice in audio or video so the speaker is harder to recognise.
Free, no uploads, no sign-up. Runs 100% in your browser.
How Voice Anonymizer works
Everything runs in your browser. Files and text are never uploaded, so the private data you are protecting never leaves your device. The ffmpeg engine shifts pitch without changing speed, and can add a phone line filter, a robotic texture and light hiss. Video is copied untouched.
Input: MP3, WAV, M4A, MP4, MOV, WEBM. Output: M4A, MP4.
How to use Voice Anonymizer
- Drop a recording or video.
- Pick a preset or set the pitch.
- Hear a 10 second preview.
- Press Change voice and download.
Tips
- Nothing is uploaded, so you can use these tools on sensitive files.
- Share passwords a different way than the file itself.
- Always check a cleaned or redacted file before you send it.
Voice Anonymizer FAQ
- Are my files uploaded?
- No. This tool runs entirely in your browser tab. Files are read from your disk into memory and the result is generated locally.
- Is it free? Are there limits or watermarks?
- Free and open source (MIT). There are no file-size caps, daily quotas, accounts or watermarks.
- Does it work offline?
- Yes, once the page (and any engine it needs) has loaded, it keeps working without a connection thanks to the service worker cache.
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