25 Free Online Synthesizers to Play in Your Browser

Here are the best free online synthesizers to play music in your web browser. Play hundreds of synth sounds without installing any software.

Most of the online synths will work with a MIDI keyboard in Google Chrome. Google Chrome appears to be the best browser to play these online synthesizers.

Best Free Online Synthesizers
Best Free Online Synthesizers

Related: 12 Free Online Sequencers

Best Free Online Synthesizers

How to Use:

  1. Click the synth images below to visit each website.
  2. Use your computer mouse or computer keyboard to play sounds.
  3. If you do not hear sound, test other web browsers. Chrome is suggested.

1. Viktor NV-1 Synthesizer

Viktor NV-1 - Online Synthesizer

The Viktor NV-1 Synthesizer was built with the Web Audio API. You can play it using a MIDI keyboard.

Save custom patches, export your library, or import libraries created by others.

Includes over 60 synth presets.

2. WebSynths Microtonal

WebSynths Microtonal - Free Online Synth

This is one of the more advanced synths on the list offering over 130 synth sounds and settings to tweak the sounds.

Press the keys on your keyboard to hear sounds played back.

The appearance of this synthesizer can be overwhelming. Click the Help link for helpful instructions.

3. TAL-NoiseMaker

TAL-NoiseMaker - Free Online Synthesizers

The TAL-NoiseMaker is an online virtual analog synth.

Click the “Bank” and “Patch” dropdown to access the 300 synth presets.

Click “Toggle Frontpanel” to change the view.

Includes: 3 OSCs, 1 Filter, 2 LFOs, 4 FX

Extras: random detune, filter drive, vintage noise



OBXD is a virtual analog synth to play online.

Click “Bank” and “Patch” to access over 200 synth presets.

Click “Toggle Frontpanel” to adjust the view.


DEXED Online Synthesizer

DEXED is a virtual Yamaha DX7 FM/PM synth.

Click “Bank” and “Patch” to access the 200 synths presets.

Click “Toggle Frontpanel” to switch the keyboard view.

6. Cardboard Online Synth

Cardboard Online Synth

This is a free online subtractive synthesizer with MIDI support.

Click the “Previous” and “Next” buttons at the bottom to switch sounds.

Includes 16 online synth presets. Works in Google Chrome or Microsoft Edge.

7. webDX7


webDX7 is a virtual Yamaha DX7 FM/PM synthesizer.

Includes 30 synth presets.

8. Virtual CZ-101


This is a virtual CZ-101 phase distortion synthesizer.

Click “Preset” or “Internal”, and one of the numbers at the top to change the preset.

9. Sympathetic Synthesizer

Sympathetic Synthesizer System Mk 1

This is a simple analog synth made with the Web Audio API.

Looks best in the Apple Safari browser.

10. Electric Telepathy

Electric Telepathy

This is a web version of the Fluoresynth synthesizer VST plugin.

Play on your computer keyboard, or use a MIDI keyboard with Chrome or Opera.

11. MIDI City


Play 128 online musical instruments like Synthesizers, Pianos, Guitars, Organs, and more.

Use your keyboard, touchscreen, or computer mouse to play sound.

12. Online Sequencer

Online Sequencer

This free online music sequencer lets you switch between 40 musical instruments.

You can play, record, and edit MIDI notes.

Click the “Instrument” dropdown to change the instrument sound.

13. Web Audio Synth V2

Web Audio Synth V2

The web version of a vintage synthesizer.

14. Juno 106

Juno 106 Online Synth

Juno-106 is an online virtual analog synthesizer.

For MIDI connectivity, you must use Chrome 43 or newer.

15. Tanguy Web Synthesizer


Tanguy creates sounds in real-time from data input through the web user interface.

This online synth looks cool, but unfortunately, it is buggy in all the browsers I tested.

Click the top left and right arrows to switch the audio preset.

16. Commodore 64

Commodore 64

An homage to the Commodore 64 that works in your web browser.

17. Modular Synthesizer

Modular Synthesizer

The Modular Synthesizer is written in HTML5 and Javascript. The real-time sound generation is with javascript. Firefox or Chrome is recommended.

18. GM Synth

Virtual Piano : GM Synth

This online synthesizer allows you to play 128 musical instruments.

Play using your computer keyboard, mouse, or connect an external MIDI keyboard.

You can adjust the reverb, octave, and quality.

More Online Synthesizers ( 8 )

  1. Omni – Pluck harp strings, bass harmonies, and add effects.
  2. Noise Sculptor – An instrument for the browser. Take the audio from ambient sound and extract music.
  3. MOD Synth – MOD is an experiment to create your own modular synthesizers or emulate different synths.
  4. Ableton Learning Synths – Experimental tools.
  5. Playtronica Sampler – A weird, but interesting synth sampler.
  6. NSynth: Sound Maker – Make unusual sounds with machine learning.
  7. AR Synth – Play virtual synths in augmented reality.
  8. Google’s Doodle: Moog Synthesizer

Frequently Asked Questions

What is An Online Synthesizer?

An online synthesizer is a replica of a synth instrument that you can play online. Synthesizers can come in a hardware form, or in a virtual form as a VST plugin that you use with music software. These free online synthesizers allow you to play synth sounds without installing software.

How Do I Play the Online Synthesizers?

Once you visit one of the online synths, use your computer mouse to click the keyboard. Or press keys on your computer keyboard to play a sound. If you do not hear any sound, try using a different web browser. Google Chrome on desktop is suggested. Some of the synthesizers offer multiple sounds. Click the preset or instrument drop-down to select different sounds.

There is No Sound. How Do I Fix This?

If you do not hear sound from one of the synths do the following to troubleshoot:

  • Check the volume on your computer.
  • Make sure you are using a supported web browser. Google Chrome on a desktop computer is recommended. Not all browsers and devices are supported.
  • Use your computer mouse to click the keys of the online synth.
  • Try holding down the keys for a longer period of time. Some of the synth sounds have a delay.
  • Try switching to another preset.
  • Try refreshing the page.
  • Try pressing different keys on your computer keyboard.
  • Refer to each website’s instructions for more help.

How Do I Connect a MIDI Keyboard?

The latest versions of Google Chrome support MIDI controllers.

  1. Connect a MIDI keyboard to your computer
  2. Restart Chrome
  3. Test one of the online synths

Not all of the synths support MIDI controllers, so test out multiple websites.

We hope you like these free online synthesizers.

Do you have a favorite?

Let us know in the comments.

Related: 100 Best Synth VST Plugins

Mark V.

Written By Mark V.
Hip Hop Makers is a music production website launched in 2008 to teach music lovers how to make music, sell beats, and make money from music.


  1. Hi, tks for this very useful info on synths! But I wonder if any of these will let me assign instrument channels to my midi Keyboard.

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