Online Synthesizer

✓ Free Online Synthesizer with Multiple Sound Presets

Free browser-based synthesizer with dual oscillators, ADSR envelope, filter, LFO & piano keyboard — no download required

🎛️ Dual Oscillators — Two independent oscillators with Sine/Square/Sawtooth/Triangle waves and pitch offset control
📊 ADSR Envelope — Full amplitude ADSR with real-time visual bars — Attack, Decay, Sustain, Release
🔊 Biquad Filter — Low-pass, High-pass, and Band-pass filters with Cutoff frequency and Resonance control
〰️ LFO Modulation — LFO oscillator with rate and depth, modulating either Pitch or Filter Cutoff

Full guide, how-to & FAQ →

⚠️ JavaScript is required This tool runs entirely in your browser and needs JavaScript. Please enable JavaScript, or open this page in a modern browser with JavaScript support, to use all features.

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