Can I type text and have a robot read it?

No. This robot voice maker has no text box and no synthetic speaker. It only changes audio you give it, so you record your own voice or upload a file. For typed text you need a text-to-speech tool.

What is the difference between this and the Voice Changer?

The audio engine is the same. This page opens on the Robot voice and explains how that one effect works and how to tune it. The Voice Changer page covers all eight voices, and you can still switch to the others here after loading a recording.

Why are the ends of my words cutting out?

The recording is probably quiet. Bitcrush rounds very low sounds to silence: under -48 dB at slider 100 and under -72 dB at slider 0. Lower the slider, record closer to the microphone, or make the file louder before you load it.

Will a robot voice hide who I am?

Do not rely on it. It is a sound effect, not a privacy tool: your words, pace and accent all come through. Also use it only on recordings you have the right to change, and do not pass off a changed voice as someone else.

Is my recording sent to a server?

No. The effect is calculated by your browser on your device, and the new file is written there too. The page counts ordinary analytics events, such as the voice and file format you picked, and never the sound or the file name. It also works on a saved file only: it is not a live changer for calls.

Robot Voice Generator

This changes a recording of your voice into a robot voice. It does not read typed text, so there is nothing to type: upload a file or record yourself, set how strong the effect is, and download the result. It all runs in your browser and the recording stays on your device.

Start from

Drop a recording here or click to browse

MP3, M4A, AAC, WAV, OGG, OPUS, FLAC, WEBM or MP4, up to 100 MB and 30 minutes.

Your recording is processed in your browser and is not uploaded.

How to make a robot voice

The Robot voice is already selected on this page. Say your line first: the effect needs a voice to work on.

1
Bring a recording
Record up to 10 minutes with your microphone, or drop an MP3, M4A, WAV or other audio file up to 100 MB and 30 minutes.
2
Set the intensity
Move the slider and switch between Original and Changed. The preview plays the first 30 seconds and follows the slider.
3
Save it
Press Change the voice to process the whole recording, then download an MP3 or a 16-bit WAV. Keep the WAV if you plan to edit it further.

This page is one voice of the Voice Changer, which also has chipmunk, telephone, echo, walkie-talkie, alien and cave. For a low voice with no buzz, use the Deep Voice Changer.

How the robot sound is made

Two effects do the work, and neither is artificial intelligence. The first is ring modulation: the voice is multiplied by a steady low tone called the carrier, 30 to 80 Hz here. Every frequency in the voice comes out as two new ones, the difference and the sum.

Take a voice at 120 Hz with overtones at 240 and 360 Hz, and a 55 Hz carrier. The 120 becomes 65 and 175 Hz, the 240 becomes 185 and 295 Hz, and the 360 becomes 305 and 415 Hz. The even 120 Hz spacing of a human voice is gone, replaced by uneven pairs, and that is the metallic part of the sound. Your speech rhythm survives, so the words usually stay clear enough to follow.

The second effect is bitcrush, which rounds every sample to a coarser scale: 2,048 steps a side at 12 bits, down to 128 at 8 bits, where a normal 16-bit file has 32,768. That rounding adds a gritty, digital edge. The pitch and the length of the recording do not change.

What the intensity slider changes

One slider moves all three settings together. You cannot set the carrier or the bits on their own here.

Slider	Carrier	Original voice kept	Bits	Quieter than this turns silent
0	30 Hz	40%	12	-72 dB
25	43 Hz	30%	11	-66 dB
50	55 Hz	20%	10	-60 dB
75	68 Hz	10%	9	-54 dB
100	80 Hz	None	8	-48 dB

From this page's robot preset. The last column is half a bitcrush step, relative to full scale. 50 is where the slider starts.

How to get a stronger or a cleaner robot

Stronger: go past 75
At 100 none of your original voice is left in the mix and the crush is at its coarsest, 8 bits. Speaking on one steady note, with little rise and fall, also helps, since a flat melody sounds less human.
Cleaner: stay under 50
At 0 the page keeps 40% of your original voice and 12 bits, so it sounds like a person with a metallic shadow and the words are easy to catch.
Record loud enough
Bitcrush steps are fixed, so a quiet recording gets fewer of them and word endings can drop out: at 100, anything under -48 dB rounds to silence. Hold the phone or microphone close, or raise a quiet file first with the Volume Booster.
Expect it a little quieter
The carrier swings through zero, so on average the result is about 3 to 5 dB quieter than what went in. The page does not raise it again. If it sits low next to other audio, run the download through the Volume Booster.
One voice, quiet room
Ring modulation changes everything it hears, so fans, traffic and music turn metallic as well. A deep robot takes two passes: save a WAV from the Deep voice, then drop that WAV back in and pick Robot.

Useful next: Volume Booster for a quiet result, Audio Pitch Changer to move the pitch by exact semitones.

Where this sound is used, and where it is not

Robot voices come from a few different machines. Knowing which one made a sound tells you whether this page can get close to it.

Daleks and Cybermen
The BBC Radiophonic Workshop used a ring modulator for these Doctor Who voices, feeding it a microphone and a tape of a 30 Hz sine wave, according to BBC Research & Development. Slider 0 here uses the same carrier frequency. It is a similar method, not a copy of that voice.
Kraftwerk and Daft Punk: a different machine
The singing robot of pop records usually comes from a vocoder, which shapes a synthesizer or other carrier sound with the envelope of your speech. This page has no vocoder, so it cannot make a voice sing in tune on a chord.
Characters and clips
It fits a robot in a school play, a game mod, an animated short, a podcast intro or a joke voice message: short lines where the sound is the point. Over several minutes the buzz gets tiring to listen to.
Text to speech: a different job
If you have a script and no recording, you need a text-to-speech tool, and this page is not one. If you are happy to read the script aloud once, record it here and you get your own timing and emphasis.

Some recordings you want to read, not remix

A robot voice is for fun. For the calls and meetings you need to remember, ParrotNotes records on your phone, transcribes the conversation and summarizes it.

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