Online synthesizer: design sounds in your browser
Learn how synthesis works by playing it. Two oscillators feed a filter with cutoff and resonance, shaped by an ADSR envelope and an LFO for vibrato, wobble or tremolo.
Start from presets like Warm Pad, Bright Lead, Warm Bass and Ambient Swell, then follow tutorials from synth basics to layering oscillators. Your settings are saved in the browser.
How to play the synthesizer with your computer keyboard
- Z to M (with S D G H J) play the lower octave, C3 to B3.
- Q to U (with 2 3 5 6 7) play the upper octave from C4, continuing on I O P [ ].
- Shift octaves by up to two in each direction; press Esc to stop all notes.
- Click or tap the 25-key on-screen keyboard.
What you can do on the virtual synthesizer
- Two oscillators with mix, detune and glide
- ADSR envelope
- Low-pass, high-pass and band-pass filter with resonance
- LFO for pitch, filter or volume
- Eight presets and eight guided synth tutorials
- Record your playing
Frequently asked questions
Can I play a synthesizer online for free?
Yes. The synth runs in your browser, is free, and saves your settings on your device.
What does ADSR mean on a synth?
Attack, Decay, Sustain and Release: how quickly a note starts, falls to its held level, how loud it holds, and how long it fades after you let go.
How do I play the synthesizer with my keyboard?
The bottom letter row plays the lower octave and the Q row plays the upper octave, with the rows above as sharps, like a piano.