Browser-Based Sound Design Synthesizer — Free Online Tool

FORGE is a browser-based synthesizer built for sound design. Choose from five oscillator shapes or upload any one-shot sample to use as a wavetable source. Shape your sound with a full ADSR envelope, resonant filter, and up to 8-voice unison with stereo spread. Play notes in real-time via the built-in keyboard or your computer keys (Z–M for lower octave, Q–I for upper).

The FX Chain tab lets you stack processing from six other Lowkey Labs tools: distortion from HIT HARD, reverb & delay from SPACE, frequency filtering from FILTER, transient shaping from TRANSIENT, pitch shifting from PITCH SHIFT, and modulation (chorus, phaser, flanger, tremolo) from DRIFT. Each rack uses the source tool's accent color and can be toggled independently.

Render any note through the full synth and FX chain, preview the result, and export as a WAV file. No sign-ups, no downloads — everything runs locally.