Hey everyone! I made SFX Forge, a small offline tool for generating retro game sound effects — jumps, coins, lasers, explosions and more — right in your browser.

• 3 waveforms free / 6 waveforms full (square with pulse width, sawtooth, triangle, sine, white & brown noise)
• 8 free presets / 48 full across 8 categories
• ADSR envelope, low/high-pass filter, live waveform preview (vibrato & feedback delay in the full edition)
• One-click WAV export, one-click batch ZIP export of every preset (full edition)
• One HTML file — double-click, no install, nothing ever leaves your computer, works offline forever
• English & Japanese UI

Free edition (3 waveforms, 8 presets): https://capsuloom.itch.io/sfxforge
Full edition ($5 — 48 presets, batch export): https://capsuloom.itch.io/sfxforge-full

It's made by me, so feedback is very welcome — happy to hear which sounds or options you'd want next.