Tone / Frequency Generator

Free

Generate sine, square, triangle, sawtooth tones at any frequency.

Frequency

440Hz

≈ A4

Frequency (20 Hz – 20 kHz, logarithmic)

Waveform

Channel

Volume20%

Warning: Start at low volume — pure tones at high volumes can cause hearing damage. Frequencies above ~17–18 kHz become inaudible with age. Square and sawtooth waves are loud due to rich harmonic content.

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What is Tone / Frequency Generator?

Updated July 25, 2026

Generate pure sine, square, triangle, or sawtooth tones at any frequency from 20 Hz to 20 kHz. Useful for hearing tests, speaker calibration, instrument tuning, tinnitus matching, and audio experimentation. Stereo channel selector, smooth attack/release, fully browser-based — no audio uploaded.

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Why choose Tone / Frequency Generator?

The Tone / Frequency Generator allows users to quickly produce pure sine, square, triangle, or sawtooth waveforms across the full audible spectrum from 20 Hz to 20 kHz. Operating entirely within the browser with client-side audio generation, it ensures privacy without uploading audio files. Features like stereo channel selection and smooth attack and release make it practical for precise audio work.

Best for

Hearing tests and frequency identification
Speaker calibration and testing
Instrument tuning and audio experimentation
Tinnitus matching and acoustic research

Good to know: Users requiring advanced multi-track synthesis, complex signal routing, or dedicated desktop audio workstations may need more comprehensive software.

How to Use Tone / Frequency Generator

Generate and customize pure audio frequencies for testing, tuning, or calibration directly in your browser.

1
Select your desired waveform type
Choose between sine, square, triangle, or sawtooth waves depending on your specific audio testing needs.
2
Enter the target frequency value
Input a specific frequency between 20 Hz and 20 kHz to generate the exact pitch required for your project.
3
Configure the stereo channel output
Use the stereo channel selector to output the tone to the left, right, or both speakers for precise calibration.
4
Activate the tone generator
Press the play button to start the audio stream with smooth attack and release transitions to protect your equipment.

Estimated time: PT1M

Frequently Asked Questions

What is the Tone / Frequency Generator used for?

This tool allows you to generate pure audio waveforms including sine, square, triangle, and sawtooth waves. It is commonly used for testing hearing ranges, calibrating audio equipment, tuning musical instruments, and conducting audio experiments.

What frequency range can this online tone generator produce?

The generator supports a wide frequency range from 20 Hz up to 20,000 Hz (20 kHz). This covers the entire standard spectrum of human hearing, making it ideal for both low-frequency subwoofer testing and high-frequency pitch analysis.

Is this frequency generator tool free to use?

Yes, this is a free tool that does not require any credits or subscriptions. Anonymous users can access up to 200 sessions, while authenticated users receive a higher rate limit of 1,000 sessions.

How do I use the different wave types like sine or sawtooth?

You can select your desired waveform directly from the interface to change the harmonic profile of the sound. Sine waves produce a pure tone, while square, triangle, and sawtooth waves provide different textures useful for technical audio testing and synthesizer calibration.

Do I need to download any software to generate tones?

No, this tool is entirely browser-based and requires no downloads or plugins. It uses your web browser's native audio API to generate frequencies in real-time on your computer, tablet, or smartphone.

Is my audio data or microphone input recorded or uploaded?

Your privacy is fully protected as no audio data is ever uploaded to our servers. All tone generation happens locally within your browser, ensuring a secure and private environment for your audio tests.

Can I adjust the audio channels and volume transitions?

Yes, the tool includes a stereo channel selector to test left and right speakers independently. It also features a smooth attack and release function to prevent clicking sounds when starting or stopping the frequency playback.