Free Tool

Free Online Tone Generator — 1Hz to 20kHz

Generate any audio frequency directly in your browser. No download. No signup. Works on phone, tablet, and desktop.

Free online tool · Works on mobile · No signup

440

1 Hz20 kHz

Volume50%

Space: Play/Stop • ← →: Adjust frequency

Use Cases

What Will You Test?

Quick Test

Before: You're at a store and want to test speakers before buying. No apps installed.

After: Open tonetool.org in your browser. Test any frequency instantly. No installation needed.

Mobile

Before: Most tone generators are desktop-only or require paid apps.

After: Full functionality on mobile. Touch-optimized controls. Test your new earbuds on the bus.

No Install

Before: Download an app, create an account, get hit with ads before you can test one tone.

After: Open the site. Generate a tone. Done in 10 seconds. No account. No ads interrupting your test.

FAQ

Does this work offline?

Once the page loads, the tone generation works without internet. However, you need a connection to initially load the page.

Is there a limit to how long I can play a tone?

No limit. Play as long as you need. Just be mindful of volume to protect your hearing.

Can I use this on iPhone/Android?

Yes. Works on all modern browsers including Safari, Chrome, and Firefox on both iOS and Android.

Why is this free?

The tool runs entirely in your browser — no server costs for tone generation. We keep it free because audio testing should be accessible to everyone.

Can I share a specific tone with someone?

Yes. Adjust the frequency, waveform, and volume, then copy the URL. All settings are encoded in the link.

The tool is free, works in your browser, and runs on any device.

No signup · No download · Works on any device