Making music accessible to everyone
Web Harmonium is a free, open-access platform that brings traditional musical instruments to your browser. No downloads, no subscriptions — just authentic sound at your fingertips.
Removing barriers to musical learning
A quality physical harmonium costs $300 to $2,000+ and weighs 5 to 15 kg. For many aspiring musicians — especially students, beginners, and those in regions where these instruments are hard to find — that cost is a real barrier.
We built Web Harmonium to change that. Our browser-based virtual instruments deliver authentic sound quality using the Web Audio API, making it possible for anyone with a computer or phone to start playing immediately.
Every tool on this site is and will remain 100% free — no hidden fees, no premium tiers, no ads. We believe music education should be open to everyone.
Free Forever
No paywalls, no subscriptions, no ads. All instruments and features are completely free to use.
Authentic Sound
Real instrument samples processed through the Web Audio API with reverb, transpose, and polyphonic support.
Accessible Anywhere
Works on any modern browser — desktop, tablet, or phone. No downloads or plugins required.
Free virtual instruments you can play right now
Web Harmonium
A browser-based virtual harmonium with 128 notes across 10 octaves. Features include volume control, reverb, transpose, octave switching, and polyphonic reed stacking.
Play harmonium online →Virtual Piano
A 5-octave virtual piano with synthesized sound. Play with your keyboard using letter keys for white notes and Shift+key for sharps and flats.
Play piano online →Harmonium Notes Guide
Complete chart mapping Sargam (Sa Re Ga Ma) to Western notes. Covers all 12 notes, komal & tivra swar, and the 10 Thaat scales.
Read the notes guide →Laptop Harmonium
Learn how to turn your laptop into a harmonium. Guide to keyboard mappings, audio setup, and getting the best sound from your computer.
Read the laptop guide →The technology behind Web Harmonium
Real Instrument Samples
Audio samples recorded from a real harmonium are decoded and stored in memory when you load the page. Each note captures the characteristic warmth and resonance of actual harmonium reeds.
Web Audio API Processing
The browser's built-in Web Audio API handles real-time pitch transposition, convolution-based reverb using impulse response files, and polyphonic playback — all running at 44.1 kHz.
Instant Keyboard Response
Keyboard events trigger audio playback with near-zero latency. The visual keyboard reflects your playing in real time, creating a responsive and natural playing experience.
Get in touch
Have a question, feature request, or found a bug? We'd love to hear from you.
[email protected]