# Voice Changer

> Transform your voice with 10 effects — chipmunk, deep, robot, alien, female, male, child, old, telephone, megaphone. 100% private.

Free voice changer with 10 presets (chipmunk, deep, robot, alien, female, male, old, telephone). Custom pitch and speed. 100% private, no upload.

URL: https://tools.scoreroute.com/tools/voice-changer/

Markdown: https://tools.scoreroute.com/tools/voice-changer/.md

### Why this voice changer is different

AI chatbots can only describe how to change a voice; they cannot process binary audio in real time. This tool uses the browser's Web Audio API to apply **real digital signal processing** — granular pitch shifting, ring modulation, band-pass filtering — that runs entirely on your device. Your audio never leaves your browser.


### 1. Choose your audio file

Drop an audio file here

or click to browse

MP3, WAV, M4A, FLAC, OGG, AAC — anything your browser can decode


### 2. Pick a voice preset

Or customize below for finer control.


### 3. Fine-tune (optional)


### 4. Apply and download


### Frequently asked questions

**Is this voice changer really free?**

Yes. It runs entirely in your browser using Web Audio API. No upload, no signup, no payment, no watermark, no daily limit.

**Are my audio files uploaded to a server?**

No. All processing happens locally in your browser using the Web Audio API. Your audio never leaves your device. You can verify this by going offline and using the tool — it still works.

**What audio formats are supported?**

Any format your browser supports for decoding: MP3, WAV, M4A, FLAC, OGG, AAC, WebM and Opus. The output is a 16-bit WAV file at the original sample rate.

**What is the difference between pitch and speed?**

Pitch shifts the voice higher or lower (chipmunk vs deep) while keeping the same duration. Speed stretches or compresses the audio in time, which also changes pitch. Use pitch for a true voice change; use speed for tempo adjustment.

**Can I use this for Discord or gaming?**

Yes. Upload a recording, apply your chosen voice effect, download the result, then use it as a soundboard sample or play it through your microphone with VB-Audio Cable or similar routing software.

**How does the robot voice effect work?**

The robot preset uses ring modulation — multiplying the audio by a low-frequency sine wave (typically 80 Hz). This creates the classic metallic, robotic tone heard in old sci-fi movies.

**Can AI chatbots transform audio like this?**

No. AI text models can only describe how to change a voice; they cannot process binary PCM audio in real time. This tool uses the browser's Web Audio API to apply real DSP that AI assistants cannot replicate.


## How it works

This free online voice changer uses the Web Audio API to transform your audio in real time using proven digital signal processing techniques. Pick a preset for instant results, or fine-tune the pitch and speed sliders for finer control.


### Pitch shifting

Adjust pitch from -12 to +12 semitones using a granular phase-vocoder algorithm. This preserves the audio duration while shifting the perceived frequency — the difference between speaking in a low voice and speaking faster in a low voice.


### Ring modulation (robot voice)

The robot effect multiplies your audio by a sine wave at a fixed frequency (typically 80 Hz). This shifts the harmonic spectrum by that frequency and back, producing the classic Dalek/robot metallic tone.


### Band-pass filter (telephone effect)

The telephone effect passes your voice through a band-pass filter that mimics the 300 Hz to 3.4 kHz range of a real phone line. This is what made phone calls sound "tinny" for decades.


### Reverb

The reverb effect uses a synthetic impulse response processed through a ConvolverNode, simulating a small room reflection.


## Privacy

Every step of the audio processing pipeline runs in your browser. The file you select never touches our servers. Close the tab and your audio is gone forever. No cookies are set, no analytics are tied to your file, no signup is required.


## Related tools

## References

- [MDN — Canvas API](https://developer.mozilla.org/en-US/docs/Web/API/Canvas_API)
- [MDN — HTMLMediaElement](https://developer.mozilla.org/en-US/docs/Web/API/HTMLMediaElement)