Hey everyone! I made RetroSample, a small offline tool that turns any audio file into crunchy retro console sound — right in your browser.

• Drop in WAV, MP3, OGG or M4A — decoded locally, nothing is uploaded
• Bit-depth reduction (16 down to 2 bits) and sample-rate reduction (44.1 kHz down to 2 kHz)
• 6 free presets / 16 full console presets (NES, Game Boy, C64, Atari 2600, Telephone, Calculator, and more)
• Wave shaping — square, pulse 25/50/75%, sawtooth, triangle (full edition)
• Before/After A-B preview, mono downmix, normalize, one-click WAV export
• Batch ZIP export, silence trim & edge fade (full edition)
• One HTML file — double-click, no install, nothing ever leaves your computer, works offline forever
• English & Japanese UI

Free edition (6 presets, bit crusher): https://capsuloom.itch.io/retro-sample
Full edition ($5 — 16 presets, wave shaping, batch ZIP): https://capsuloom.itch.io/retro-sample-full

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