Ultrasonic Frequency Generator — Up to 48 kHz

The first browser-based ultrasonic generator that pushes audio hardware to the maximum. Generate frequencies up to 48 kHz using 96 kHz sample rate — far beyond the 20 kHz limit of standard tools. Includes real-time spectrum analyzer to verify output.

How to Use

Check your hardware

The tool auto-detects your audio sample rate. Higher sample rate = higher maximum frequency. USB audio interfaces support up to 96 kHz.

Set frequency and waveform

Use the slider or type an exact frequency (15,000–48,000 Hz). Choose sine for a pure tone or square for harmonics-rich signal.

Generate and verify

Press Generate — the spectrum analyzer will show a peak at your chosen frequency, proving the signal is being produced even if you can't hear it.

Try the sweep

Set a start and end frequency, then run a sweep to test your speaker's ultrasonic response across the full range.

Generate frequencies beyond human hearing with real-time spectrum verification

Sample rate: —

Frequency Hz

20,000 Hz

Volume 30%

⚠️ High volume may damage hearing or speakers. Use caution.

Spectrum Analyzer

Ultrasonic Sweep

From Hz

To Hz

Duration s

Hearing & Frequency Ranges

Features

Generate up to 48 kHz via high sample rate AudioContext (96 kHz) — beyond any browser competitor Real-time FFT spectrum analyzer visually verifies the ultrasonic output Ultrasonic sweep from 15 kHz to your hardware maximum with live visualization Auto-detect hardware capability and hearing reference (human by age, dog, cat, bat, dolphin)

FAQ

How can a browser generate ultrasonic frequencies?

Standard audio is limited to 22 kHz (44.1 kHz sample rate). This tool creates an AudioContext at 96 kHz sample rate, enabling frequencies up to 48 kHz — true ultrasonic.

Can I actually hear ultrasonic frequencies?

No. Human hearing typically caps at 15-20 kHz (age-dependent). The spectrum analyzer visually confirms the tone is being generated even though you can't hear it.

Will this damage my speakers?

Most speakers are designed for 20 Hz - 20 kHz. Playing ultrasonic frequencies at high volume may stress tweeters. Start at low volume and increase carefully.

Why does my device show only 22 kHz max?

Your audio hardware may not support high sample rates. Built-in laptop/phone speakers typically max at 44.1-48 kHz sample rate. USB audio interfaces often support 96-192 kHz.

What are ultrasonic frequencies used for?

Ultrasonic cleaning (25-80 kHz), medical imaging, industrial testing, animal communication research, and pest deterrence. This tool is for testing and education.

💡 Want us to improve this tool just for you?

We can — and it's free! Just send us a quick message with your idea. If you'd like to discuss it in detail, leave your email and we'll get back to you. You can stay anonymous.

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Published 30 Mar 2026 Updated 21 May 2026