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Alarm Sound Generator

Six classic alert sounds - sirens, beeps and buzzers - synthesized live in your browser. Play them instantly or download any pattern as a looping WAV for projects, games and videos.

⚠ Sirens are designed to be unpleasant at volume - start low, especially on headphones.

How these sounds work

Every alert here is one oscillator pushed around by another. The wail is a sine wave whose pitch is swept ±350 Hz by a slow sine; speed that sweep up twentyfold and it becomes the yelp. The hi-lo siren snaps between 450 and 650 Hz with a square-wave modulator instead of gliding. The common thread: pitch that keeps moving. Your auditory system habituates to steady tones within seconds, but a modulated one re-triggers attention on every sweep - which is exactly what an alarm is for. Build your own variants with the sweep generator or layer tones in the multi-tone generator, and convert downloads to MP3 with the audio converter.

Alarm Sounds FAQ

What do the different siren patterns mean?

Wail (the slow rise and fall) is the default cruising siren in North America; yelp (the same sweep, ten times faster) is for intersections, where fast modulation cuts through better; hi-lo two-tone is the classic European emergency sound. They all work by constantly changing pitch - a moving tone is far harder for the brain to tune out than a steady one.

Can I download these as files?

Yes - pick a pattern and press Download WAV to get a ten-second seamless-looping WAV rendered in your browser. Convert it to MP3 with the audio converter if you need a smaller file for a phone alarm or a project.

Why do alarms use these frequencies?

Most alert tones live between 500 and 1500 Hz: high enough for small speakers to reproduce loudly, low enough to carry through walls and background noise, and centered where human hearing is most sensitive. Smoke alarms sit near 3 kHz for maximum ear sensitivity - which is also why they are so unpleasant.

Is it legal to play siren sounds?

Playing them from your computer or phone is fine. Mounting a device that imitates an emergency siren on a vehicle, or using one in public in a way that could be mistaken for a real emergency, is illegal in most jurisdictions. Keep it in the studio, the game, or the video edit.

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