Record a line or upload a clip, and this robot voice changer turns it into a cold, metallic machine voice with a touch of 8-bit grit. Compare it with your original, then download a WAV. Free, private and right in your browser.
How it works
Three steps and about a minute. Speak normally; the effect takes care of the robot part.
Step 1
Press Record and speak for up to 60 seconds, or upload an MP3, WAV, M4A or OGG file up to 20 MB and 5 minutes long. A quiet room matters more than a fancy mic, because the effect makes background hum buzz too.
Step 2
Robot is already selected, so just press Apply effect. Your browser renders the clip on your own device in a few seconds. Curious how the same take sounds as an alien or over a radio? Tap another effect and it re-renders right away.
Step 3
Flip between Original and Robot while it plays and you hear the switch at the exact same moment in the clip. When it sounds right, download a mono WAV that drops straight into a video editor, game engine or podcast project.
Scripts to try
Short, clipped sentences make the best robots. Read one aloud when you press Record, or write your own in the same style.
Greetings, human. I am unit seven. I have been programmed to assist you.
Keep every word on the same note, like a machine reading a list.
Warning. Core temperature critical. All crew must leave the station in sixty seconds.
Pause at each period. The silences make it sound computed.
Access denied. Your clearance level is insufficient. Return to sector four.
Trick or treat detected. Dispensing one piece of candy. Please take only one.
Loop it on a hidden speaker next to the candy bowl.
Everything is fine. Everything is fine. Every-every-everything is fine.
Stutter a syllable on purpose for a glitchy, broken-robot feel.
Highlights
Three classic studio tricks stacked in a fixed recipe, tuned so your words stay easy to understand.
Your voice is multiplied by a steady 48 Hz tone. That turns each harmonic into a pair of new frequencies that no longer line up the way a human voice does, and the ear hears cold, buzzing metal. Sci-fi TV used the same trick for its robot villains back in the 1960s.
About a third of the signal is cut down to 7-bit resolution at a third of the sample rate, the crunchy texture of early game consoles and talking toys. Mixed in lightly, it adds a digital edge without turning your words into static.
An 11-millisecond delay fed back into itself rings at about 91 Hz and its multiples, like talking down a metal pipe. A low cut at 110 Hz trims boominess and a small lift at 1.6 kHz keeps consonants crisp, so the robot still sounds clear.
Quick reference
Every clip goes through the same chain in this order, so retakes match each other exactly.
| Stage | Setting | What you hear |
|---|---|---|
| Bitcrusher | 7-bit, 1/3 sample rate, 35% mix | Retro digital crunch |
| Ring modulator | 48 Hz carrier, 85% mix | Metallic, buzzing tone |
| Low-cut filter | 110 Hz | Less boom, tighter sound |
| Presence boost | +3 dB at 1.6 kHz | Clearer consonants |
| Comb echo | 11 ms delay, 50% feedback | Hollow, tin-can ring |
| Output | Mono 16-bit WAV, peak −1 dBFS | Loud, clean file to edit |
Your pitch and timing are not changed, so the robot keeps your rhythm and lines up with your video. The settings are fixed; there are no sliders to tune.
A human voice is built from a fundamental pitch plus a ladder of harmonics at exact multiples of it. If you speak at 200 Hz, your voice also contains 400, 600 and 800 Hz, and that neat ladder is a big part of what makes a sound feel alive. A ring modulator multiplies your voice by a steady tone and swaps every rung for two new ones: the original frequency plus the carrier, and the original minus it.
With the 48 Hz carrier used here, that 200 Hz fundamental becomes 152 and 248 Hz, and 400 Hz becomes 352 and 448 Hz. The new tones aren't multiples of any single pitch anymore, so your brain stops hearing a person and starts hearing a machine. A low carrier keeps speech easy to follow and adds a buzzy throb; a higher one sounds glassy and bell-like, which is the direction the alien voice changer takes.
The other two stages set the era. Bitcrushing throws away detail the way early digital chips did, and the short comb echo adds the boxy ring of a voice coming out of a metal body. Without the crusher you get 1960s sci-fi; with more of it you get a broken toy.
Record clean. Hold your phone or mic about 6 to 8 inches (15–20 cm) from your mouth, a little off to the side so P and B sounds don't pop. Your browser's noise suppression is on while you record, but it can't catch everything, and the ring modulator treats fan hum and street noise as part of your voice, so they buzz along with it. A closet full of clothes beats an echoey kitchen.
Talk like a machine. The effect doesn't flatten your pitch, so do it yourself: keep every syllable on roughly the same note, give each word equal weight and drop the ups and downs of normal conversation. Hard consonants such as T, K and P cut through the buzz best, and a beat of silence between sentences makes the voice feel calculated rather than chatty.
Rather type than talk? The robot voice generator creates robot speech from text with AI. It needs a free account, uses credits, and can run its result through these same effects. This voice changer is the free option that keeps your own timing, accent and delivery, which matters when the voice has to match lip movements or a game animation.
A robot voice is a costume, not a disguise. Use it for characters, videos and jokes that everyone is in on, and never to impersonate someone or mislead people about who is speaking.
Last updated October 21, 2026
Use cases
From a ten-second meme to a whole game cast, the robot is one of the most reused voice effects there is.
Robot narrators, AI-character skits and tech channel intros. The WAV drops straight onto your editing timeline.
Voices for droids, terminals and boss robots in game jams and indie projects, recorded in minutes.
Coding lessons, science-fair robots and class presentations with a voice that matches the cardboard costume.
A looping greeting for a robot costume, a trick-or-treat station or a sci-fi themed party.
FAQ
Quick answers about the robot effect, file limits and privacy.
Still have a question?
The quickest way to find out is to try it yourself. It only takes a minute.
Keep exploring
Record a line, apply the effect and download it in about a minute. Free, no sign-up, and your audio never leaves your device.
