Unlicensecommercial OKCredit: Not requiredverified 78d agoGo to source
Browser port of DrPetter's sfxr, the 8-bit sound effect generator. Press a category button (pickup, laser, explosion, powerup, hit, jump, blip), get a usable retro SFX, tweak the oscillator and envelope sliders, export WAV. This closes the gap that no fixed SFX pack can: when a specific interaction needs a sound that is not in Kenney's set, generating one takes seconds and the result is unencumbered because you made it.
[](https://tmhsdigital.github.io/Free-Game-Dev-Assets/entry/jsfxr/)
HTML:
<a href="https://tmhsdigital.github.io/Free-Game-Dev-Assets/entry/jsfxr/"><img src="https://tmhsdigital.github.io/Free-Game-Dev-Assets/badge/jsfxr.svg" alt="Licence read by Free Game Dev Assets" /></a>
Follow licence changes (an Atom feed of changes to this licence, its commercial use, credit or status)
Runs entirely client-side, so no upload and no account; the permalink encodes the full parameter set, which makes a sound reproducible from a URL in a design doc
Exports 8-bit or 16-bit WAV at 44100 Hz; pick 16-bit unless you want the quantization crunch as an aesthetic
Output is short and mono by design; layer two exports in an editor for anything meaty
The generator is Unlicense so the code is public domain, and sounds you generate are your own output, not a redistribution of licensed content
A paid "jsfxr pro" desktop version exists; the web generator linked here is the free one
Evidence
UNLICENSE in the repository (2026-08-24): "free and unencumbered software released into the public domain"
Same file (2026-08-24): "for any purpose, commercial or non-commercial, and by any means"
