Online Speech Jammer
The free voice jammer that plays your own words back with a delay — try the classic Delayed Auditory Feedback prank right in your browser. No download, no sign-up.
Try it now ↓Speech jammer tool
Press start and allow microphone access. 🎧 Headphones strongly recommended.
Can't use the mic here? Get the full Speech Jammer app instead:
Your audio is processed locally in your browser. Nothing is recorded or uploaded.
Take it anywhere — get the app
Want to prank your friends on the go? The free Speech Jammer app adds more delay range and works without a browser.
Tongue twisters to try
Not sure what to say? Read one of these classic tongue twisters out loud while the speech jammer runs. Tap one to enlarge it.
What is a Speech Jammer?
A speech jammer is a tool that records your voice and plays it back to you a fraction of a second later. That short lag is called Delayed Auditory Feedback (DAF). Because we constantly rely on hearing ourselves to control how we speak, hearing a delayed echo throws the whole process off — most people start to stammer, slow to a crawl, or lose their train of thought entirely.
The effect was first studied by researchers in the 1950s and later turned into a viral gadget by Japanese inventors, whose “SpeechJammer” gun won an Ig Nobel Prize. Today you can get the same result instantly with this online speech jammer — no special hardware needed, just a microphone and a pair of headphones.
DAF is more than a party trick. Speech-language therapists use delayed auditory feedback as a tool for people who stutter, and language learners use it to slow down and hear their own pronunciation. Whether you are here to prank a friend or to experiment with your own voice, this free speech jammer lets you try it in seconds.
Frequently asked questions
What is a speech jammer?
A speech jammer plays your own voice back to you through your headphones after a short delay. This effect, called Delayed Auditory Feedback (DAF), confuses your brain and makes it almost impossible to keep speaking normally — you start to stutter, slow down, or trip over your words.
Is this speech jammer free?
Yes. This online speech jammer is completely free, with no sign-up and no download required. Just press Start and allow microphone access.
Do I need to download anything?
No. It runs right in your browser. If you want extra features and to use it on the go, grab the free Speech Jammer app for iOS or Android.
What is a voice jammer?
"Voice jammer" is another name for a speech jammer. Both describe the same delayed-audio-feedback trick that scrambles your ability to talk.
Does it work on my phone or iPhone?
Yes, it works in mobile browsers including Safari on iPhone. Use wired headphones for the strongest effect — Bluetooth headphones add their own audio delay on top of the slider, which softens the timing. A desktop with wired headphones is the most reliable setup.
Why does it need my microphone?
The speech jammer has to hear your voice in order to delay it and play it back to you. Audio is processed locally in your browser and is never recorded, stored, or uploaded.
Can I use the speech jammer on PC?
Absolutely. A desktop or laptop with a microphone and headphones gives the cleanest result, which is why most people try the speech jammer on PC first.