The Free, Open Web Audio Lab for Everyone
Free Hz Generator is a precision audio toolkit built entirely in the browser. No downloads, no sign-ups, no cost — just the raw power of the Web Audio API in a clean, fast interface.
Our Mission
Professional audio software can cost hundreds of dollars. Audiometers cost thousands. We believe that fundamental audio tools — tone generation, hearing tests, acoustic calibration — should be freely accessible to anyone with a web browser.
Free Hz Generator was built by audio enthusiasts who wanted a fast, precise, no-nonsense tone generator that didn't require a plugin, a subscription, or a page full of ads. Every feature is built with accuracy and simplicity in mind, following ISO 16 and ANSI S1.26 standards where applicable.
We keep it free. We keep it private. We keep it open.
What We Offer
Pure Tone Generation
Generate perfectly precise sine, square, sawtooth, and triangle waves from 1 Hz all the way to 20,000 Hz. Every tone is computed in real time by the Web Audio API — no pre-recorded samples.
Acoustic Diagnostics
Speaker tests, headphone channel checks, frequency sweeps, and room resonance analysis. Everything an audio engineer needs, right in the browser.
Lossless WAV Export
Download any generated tone as a 16-bit or 32-bit float WAV file using the OfflineAudioContext API. Perfect quality, zero compression artifacts.
Binaural Beats
Independently control left and right channel frequencies to create binaural beat effects for focus, relaxation, or sleep — with real-time oscilloscope visualisation.
Works Offline (PWA)
Install Free Hz Generator as a Progressive Web App. All tools work fully offline once cached — no internet required after first load.
Zero Tracking
No ads. No analytics. No cookies. No accounts. Just pure audio tools. Your frequency sessions stay entirely in your browser.
Who Uses It
Musicians
Tune instruments, identify notes, generate reference pitches.
Audio Engineers
Speaker calibration, room mode detection, frequency response testing.
Researchers
Auditory perception studies, psychoacoustics experiments, tinnitus masking.
Educators
Teach wave physics, acoustics, and the fundamentals of sound.
Audiologists
Preliminary hearing screening tool and hearing range reference.
DIY & Makers
Test speaker builds, enclosures, and custom audio electronics.