Free Online Tool · Trusted by 10,000+ Users

Hear What Your Headphones Really Play

Test headphones, tune instruments, match tinnitus tones — all in your browser. No download. No signup. Completely free.

No signup required · Works on mobile · 100% free

440

1 Hz20 kHz

Volume50%

Space: Play/Stop • ← →: Adjust frequency

How It Works

Three Steps to Any Tone

Set Your Frequency

Drag the slider or type any value from 1Hz to 20,000Hz.

Pick Your Waves

Choose sine, square, triangle, or sawtooth — whatever your test needs.

Hit Play

Hear the tone instantly. Adjust volume anytime. Share settings via URL.

Use Cases

What Will You Test?

Headphone Testing

Test Your New Headphones

Before: You bought headphones online. They sound off, but you can't tell if it's the bass, mids, or highs.

After: You run a quick frequency sweep from 20Hz to 20kHz. You find the dead spot at 4kHz. Return window still open.

Tone Generator plays any frequency instantly. You hear exactly what your headphones reproduce — and what they don't.

Hearing Care

Describe Tinnitus to Your Doctor

Before: Your doctor asks, "What pitch is your ringing?" You shrug. You can't describe a sound.

After: You dial up frequencies until one matches your ringing. You note the exact Hz. Your doctor now knows what to test.

Precise 1Hz-step control lets you zero in on any tone. No guessing. No medical jargon needed.

Note: This is not a medical device. Use it to prepare for your appointment, not to self-diagnose.

Music & Audio

Tune Instruments Without Gear

Before: Your guitar sounds off, but you don't own a tuner. You download an app, create an account, get hit with ads.

After: You open Tone Generator, set A4 = 440Hz, play the tone, tune your string. Done in 30 seconds.

A4, E, B, and common tuning frequencies are one click away. No account. No ads. Just the tone you need.

Features

Built for Precision

Full 1Hz–20kHz Range

Generate any frequency from 1Hz to 20,000Hz with precise digital input or smooth slider control. Competitors limit you to preset steps — we don't.

1Hz

20kHz

20Hz1kHz10kHz

Mobile-First Design

Full functionality on phone, tablet, and desktop with touch-optimized controls. Test your new earbuds on the bus. No laptop needed.

URL Sharing

Every setting is encoded in the URL — frequency, waveform, volume. Send a 440Hz sine wave link to a student. Bookmark your tinnitus match.

FAQ

Common Questions

Is it really free?

Yes. The tone generator is completely free — all waveforms, full frequency range, visualization, and mobile support. No signup needed.

Do I need to create an account?

No. The tool works instantly in your browser. We don't collect your email or personal data for basic use.

How accurate are the frequencies?

Frequencies are generated digitally via the Web Audio API with sample-accurate timing. For most testing purposes — headphones, speakers, instrument tuning — the precision is more than sufficient. This is not a calibrated laboratory instrument.

Can I use this for medical diagnosis?

No. Tone Generator is not a medical device. It can help you identify a tinnitus frequency to discuss with your doctor, but it cannot diagnose hearing loss or any medical condition. Always consult a healthcare professional.

Is my audio data stored?

No. All audio generation happens locally in your browser. We never upload, store, or process your audio.

How is this different from onlinetonegenerator.com?

Three things: cleaner design (no cluttered interface), better mobile experience, and no intrusive ads. We focus on doing one thing well — generating precise tones instantly.

You already know what frequency you need to hear.

The hard part is finding a tool that works instantly, doesn't bombard you with ads, and runs on your phone.

Open Tone Generator

No signup · No download · Works on any device