undetectable.me

Voice anonymiser

Shift your voice so it is harder to match

A speaker is recognised by pitch and by the resonances of their vocal tract, the formants that give a voice its timbre. This shifts both, separately, so a clip is harder to match back to you by ear or by a voiceprint system, while staying understandable. It runs on your device and changes nothing about what is said.

Runs entirely in your browser. Your file is never uploaded or stored.

Pitch and timbre are two different knobs

Raising or lowering pitch alone gives the cartoon "chipmunk" or "monster" effect, and a matcher can often undo a simple pitch change. The resonances of your vocal tract, the formants, are a stronger identity cue, so this tool moves them separately. Shifting pitch one way and timbre the other pulls a clip further from your natural voice than either move alone, which is what the disguise presets do.

What this does not do

This is a deterministic shift, not a disguise that fools a determined analyst. A modern speaker system trained to ignore pitch and formant changes can still find a match, especially from a long clip, and your speaking rhythm, word choice and accent are untouched. Treat it as raising the bar, not as anonymity. Larger shifts hide more but sound more processed; small shifts stay natural but hide less.

Compare, then download in any format

After you apply, the Before and After players sit side by side so you can flip between the original and the shifted version and pick a setting that still sounds like you meant it to. When you are happy, download the result as lossless WAV or FLAC, or as a smaller MP3, M4A or Opus. M4A and Opus are offered only when your browser can create them.