Online Tool Store
Voice Changer
Free online voice changer: record your mic or upload audio, apply robot, chipmunk, deep, or echo effects instantly, then play back or download the WAV.
🔒 This tool runs entirely in your browser. Your files are never uploaded to a server.
Click "Start recording" and allow microphone access, then speak for a few seconds.
How it works
- Pick an effect - Robot, Chipmunk, Deep, or Echo.
- Click Start recording and speak for a few seconds, or upload an existing audio file instead.
- Listen to the original and the effected clip side by side, or download the result.
- Try another effect any time - it re-processes your last recording or upload instantly.
The methods
Each effect runs directly on the recorded audio's raw samples, decoded via the Web Audio API:
Robot: output[i] = input[i] × sin(2π × 40Hz × i / sampleRate) Chipmunk: output[i] = input[i × 1.6] (interpolated) Deep: output[i] = input[i × 0.75] (interpolated) Echo: output[i] = input[i] + Σ 0.5ⁿ × input[i − n × delay], for n = 1 to 3
Multiplying the signal by a steady low-frequency tone - ring modulation - is the same technique behind classic sci-fi robot voice effects. Reading the samples back at 1.6× speed (Chipmunk) raises both pitch and tempo together, while reading them back at 0.75× speed (Deep) lowers both together - the same resampling trick run in opposite directions. For Echo, three fading copies of the signal are layered back in after a 220ms delay each, then the result is normalized so the combined peaks don't clip.
FAQ
Is my recording sent anywhere?
No. Recording, the effect processing, and playback all happen locally using your browser's microphone and Web Audio APIs - your voice is never uploaded, not even to us.
Why doesn't recording start automatically?
Browsers require an explicit click before a page can request microphone access, and they show their own permission prompt - a page can't turn your mic on by itself. Click Start recording and allow access when your browser asks.
Can I use an existing audio file instead of recording?
Yes - click "Upload an audio file" and choose an MP3, WAV, OGG, M4A, WebM, AAC, or FLAC file (up to 20MB). It's processed the same way as a recording: pick an effect and it applies instantly.
Why is recording limited to 8 seconds?
It keeps processing near-instant and the resulting clip easy to preview and share - plenty for testing an effect. Record again if you need a different take. Uploaded files aren't held to this limit, though very long tracks take longer to process.
Can I switch effects without recording again?
Yes - your last recording or uploaded file stays in memory, so picking a different effect re-processes it immediately. You only need to record or upload again to change the source audio.
Why does the chipmunk effect also speed things up?
It's a simple, honest trade-off: raising pitch without changing speed needs a more complex algorithm (a phase vocoder). This tool resamples the audio faster instead, which raises pitch and speed together - the same trick behind classic chipmunk-voice effects.
How does the Deep effect work?
It's the same resampling trick as Chipmunk, run in reverse: reading the samples back more slowly lowers both pitch and tempo together.
What format is the downloaded file?
A standard uncompressed WAV file, generated directly from the processed audio samples - it plays everywhere without needing a codec, at the cost of a larger file size than a compressed format like MP3.
Do I need to sign up or install anything to change my voice?
No - it's completely free, works entirely in your browser, and there's no account, install, or watermark on the download.
Can I make my voice sound like a girl, a monster, or another specific character?
Not directly - this tool sticks to four transparent effects (Robot, Chipmunk, Deep, Echo) with the exact math shown on this page, rather than character presets or AI voice conversion. Chipmunk and Deep are the closest matches to a higher or lower voice.
How we compare
| Feature | Online Tool Store | SoundTools | VoiceWarp | VocalDock |
|---|---|---|---|---|
| Record your mic or upload an audio file | ✓ | ✓ | ✓ | ✓ |
| Exact DSP formula published for every effect | ✓ | Presets only, no formulas shown | Marketed as AI voice conversion, no formulas shown | Preset list only, no formulas shown |
| No sign-up, no watermark, free | ✓ | ✓ | ✓ | ✓ |
SoundTools, VoiceWarp, and VocalDock pack in far more presets and manual sliders (pitch, formant, reverb, EQ, and more) for people who want to fine-tune a specific sound. Voice Changer keeps it to four curated effects with the exact math behind each one shown right on this page - record or upload, pick an effect, and you're done in a few clicks.