Audio Scrambler
Disguise a voice by shifting its pitch and tone
Your files are processed on your device. The first use downloads a processing engine, which your browser then keeps.
Drop an audio fileTap to choose an audio file
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Disguise a voice by shifting its pitch
Large files (over 500 MB) may take longer or run out of browser memory
About Audio Scrambler
Disguises a voice by shifting its pitch, useful for anonymizing a recording before sharing it — for example, a whistleblower-style interview, or protecting someone's identity in a recording. Runs entirely in your browser — the audio never leaves your device.
Upload your audio file, choose how much to shift the pitch (lower for a deeper voice, higher for a lighter one), and download the disguised result. The duration stays the same either way.
This is a real, effective way to make a voice hard to recognize casually, but it isn't forensic-grade anonymization — speech patterns, cadence, and word choice can still potentially identify someone regardless of pitch. For genuinely high-stakes anonymity needs, treat this as one layer, not the only one.
Watch: Audio Scrambler in Action
- Is this enough to fully anonymize someone's identity in a recording?
- It's a real, effective way to make a voice hard to recognize casually, but it isn't forensic-grade anonymization — speech patterns, cadence, and word choice can still potentially identify someone regardless of pitch shift. For genuinely high-stakes anonymity needs, treat this as one layer, not the only one.
- Is the voice scrambled or encrypted, and can it be undone?
- No. The tool shifts the pitch up or down by a number of semitones and keeps the timing. Anyone with the output can shift it back by the opposite amount and get close to the original voice, so it is a disguise, not protection.
- Why can't I click Disguise Voice?
- Both Preview 8 s and Disguise Voice are disabled while the slider is at 0 semitones, because nothing would change. They are also disabled during processing or when the file is over the size limit shown in a notice.
- Does the audio get faster or slower?
- No. The pitch is moved and then the tempo is compensated, so the recording keeps its original length. Voices sound deeper at negative values and lighter or higher at positive ones, and the words stay at the same speed.
- What does Preview 8 s actually do?
- It processes only the first eight seconds of your file at the current setting and plays it back, so you can compare settings quickly. Changing the slider clears the preview, and the full file is only made when you press Disguise Voice.
- Will repeating the process make it harder to reverse?
- Not much. Two shifts simply add up, so +6 followed by -6 returns near the start. The page suggests a large shift followed by a different one for a stronger effect, but each pass also adds a little audible processing noise.
- Do I need permission to record someone?
- The FCC has no rules on individuals recording their own phone calls, but some state laws restrict recording. Laws differ by place and situation, so get consent from the people involved where in doubt. This is general information, not legal advice. Check the official source. Official source: FCC: Recording Telephone Conversations
How to use Audio Scrambler
Drop an audio file. The Pitch Shift slider runs from -8 to +8 semitones in steps of one and starts at -3. You can also click a preset: Strongest Deep (-8), Deep Voice (-6), Slightly Lower (-3), Slightly Higher (+3), High Voice (+6) or Strongest High (+8).
Press Preview 8 s to hear only the first eight seconds with the current setting, which is quick, then adjust until the voice sounds different enough. When you are happy, press Disguise Voice to process the whole file and download it as disguised_ followed by the original name. Both buttons stay disabled while the shift is 0, since that would change nothing.
When to use it
It is useful when a voice should not be recognised at a glance: a recorded interview where the speaker wants some cover, a sample posted publicly, or a voice-over where you want a deeper or lighter character without re-recording. The pitch changes while the length of the audio stays exactly the same.
When not to use it
Do not rely on it to hide someone's identity from people who know them, from a forensic examiner or from anyone who can simply shift the file back. Word choice, accent and rhythm are untouched. For a truly sensitive recording, summarize in writing or re-record with a different voice, and consider the pitch change only an extra layer.
Tips for best results
Use the eight-second preview on a part where the person is speaking, not a pause, or you will judge nothing. Larger shifts of 6 to 8 semitones hide more but sound more unnatural. Applying a second shift on top of the first adds the two together, so running -6 and then +3 nets out to -3, not a separate disguise.
Limitations
This is a pitch shift only; nothing is encrypted or mixed up. Shifting by the opposite number of semitones brings the voice close to its original pitch, with some loss from the extra processing, so treat it as reversible. The range is limited to eight semitones each way, in whole steps, and output stays in the source format, so lossy files are encoded again.
Privacy
The pitch change is calculated on your device, so the voice you are trying to protect is never sent to a server, which matters more for this tool than most. The processing engine, about 25 MB, comes from a public CDN on first use. Previews and the finished file are held in your browser until you save them, and no copy is kept elsewhere.
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