Online Synthesizer

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

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Features

🎛️

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

🎹

Piano Keyboard

3-octave keyboard with mouse/touch drag support and QWERTY mapping

💾

Presets & WAV Export

6 built-in presets (Bass Lead, PAD, Pluck, Bell, Organ, Acid) and record-to-WAV export

How to Use

1

Enable Audio

Click anywhere on the page to activate the Web Audio engine

2

Adjust Synthesis Parameters

Configure oscillators, filter, ADSR envelope and LFO using the control panel on the left

3

Play the Keyboard

Use your mouse, touch, or QWERTY keyboard to play notes — use Space as a sustain pedal

4

Record & Export

Hit Record, play your piece, then stop and download as a WAV file

Frequently Asked Questions

What is an online synthesizer?
A web synthesizer is a virtual musical instrument that runs entirely in your browser using the Web Audio API. pudone!'s synthesizer supports dual oscillators, ADSR envelopes, filters, and LFO modulation — no installation required.
Is the synthesizer free to use?
Yes, completely free. All synthesis, recording, and WAV export happens locally in your browser — no data is sent to any server.
What is ADSR in a synthesizer?
ADSR stands for Attack, Decay, Sustain, and Release — the four stages of an amplitude envelope that shape how a note starts, transitions, holds, and ends. pudone!'s synthesizer visualizes these as real-time bars.
How does the dual oscillator system work?
The main oscillator produces the fundamental tone. The second oscillator adds a layered tone with adjustable pitch offset (from -24 to +24 semitones) and mix level, letting you create richer, more complex timbres.
Can I use my computer keyboard to play?
Yes. The QWERTY mapping matches a standard piano layout: A–L for white keys, W/E/T/Y/U/O/P for black keys. Space acts as a sustain pedal. Octave shift buttons let you move ±2 octaves.

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