Online MIDI Player, Editor and MIDI to MP3 Converter
The privacy-first MIDI studio. Process files instantly in your browser without uploading to any server.
No Signup Required
No upload • Privacy‑friendly • Works offline (PWA ready)
from 99+ happy users
Audio to MIDI
AI detects notes in recordings and generates MIDI. A free trial is available.
MIDI Player
Play, loop and speed control.
MIDI Editor
Edit notes, pitch & velocity in browser.
MIDI Converter
Convert MIDI to MP3/WAV.
MIDI Score
View MIDI as sheet music.
MIDI Visualizer
Visualize MIDI with interactive Piano Roll.
MIDI Analyzer
Inspect technical data.
What is MIDI Toolbox
MIDI Toolbox combines a MIDI Player, in-browser MIDI Editor and MIDI to MP3/WAV converter with cloud Audio-to-MIDI transcription. Playback, editing and MIDI-to-audio conversion run locally; Audio to MIDI uploads audio to our cloud transcription service for processing.
- Online MIDI PlayerLoad and preview MIDI instantly with precise timeline and looping.
- MIDI Editor (in-browser)Edit piano roll, quantize, adjust velocity and export. No install.
- MIDI to MP3/WAVExport high-quality audio with configurable bit rate and normalization.
Why professionals trust MIDI Toolbox
Experience a studio-grade MIDI environment directly in your browser, designed for privacy, efficiency, and accessibility.
Get started in 3 steps
Start with the Player, edit in the Editor, and export with the Converter.
Key Features
Everything you need for MIDI playback, editing and exporting.
Precise Timeline & Loop
Scrub, set A/B loop points, and practice efficiently.
Piano Roll Editing
Add, move, lengthen notes with snapping and quantize.
Velocity & CC Basics
Adjust velocity and essential MIDI controls quickly.
Instrument Presets
Switch GM instruments and save track settings.
High-quality Export
MP3/WAV export with bitrate, sample rate and fade.
Privacy by Design
MIDI playback, editing and MIDI-to-audio conversion run locally. Audio-to-MIDI transcription uses cloud processing.
Loved by musicians and students
Fast workflow • Clear UI • Reliable exports
Conversions
Unlimited
No daily limits
Toolkit
All-in-One
Player, Editor & Converter
Audio Quality
Studio
Lossless Export
What users say
Creators use MIDI Toolbox to sketch ideas and export tracks quickly.
Indie Producer
Music Creator
Playback, quick edits and MP3 export all in one place. The A/B loop is perfect for practice.
Music Student
Learner
I can slow down, loop difficult bars and tweak notes—right in the browser, no install needed.
Piano Teacher
Educator
My students love the visualizer. It helps them understand note duration and rhythm without getting overwhelmed by sheet music.
Game Dev
Developer
The MIDI to JSON converter is a lifesaver for my web games. Fast, accurate, and runs offline.
Create, edit and export MIDI in your browser
Open a tool and start now—no install required.
Free Online MIDI Tools — Player, Editor, Converter & More
MIDI tools in the browser let you play, edit, convert and generate MIDI with zero installs. Our MIDI tools handle tempo, key and channel cleanup, so creators can analyze files, fix issues and export clean results quickly. With WebMIDI support, these MIDI tools keep audio workflows fast, accurate and privacy‑friendly. Use the MIDI tools to practice, arrange and share ideas across DAWs and devices.