MIDI Editor Online

Free to use — no sign-up needed. Guests get 1 full editing session; signed-in users get unlimited editing sessions.

A MIDI editor that runs in your browser instead of installed software. Load a MIDI file and edit pitch, timing, length, and velocity on a piano roll grid — everything runs locally, and your files never leave your computer. Same idea as a DAW's piano roll, minus the install.

Yes. Open a blank project, set tempo and time signature, and click notes into the piano roll to build melodies, chords, or full arrangements. Export as .mid when done. Start simple — a melody first, then chords, then bass — and export when the arrangement feels done.

Yes — that's the main job. Import any standard MIDI file (.mid/.midi, format 0 or 1); each track opens in the piano roll, ready to edit. Wrong notes, drifting timing, a key that's too high — all fixable in minutes.

Yes. Upload any .sf2 SoundFont in the sound settings to replace the built-in sounds. It loads into your current browser session only — never uploaded or stored.

No. Any modern desktop browser works — Chrome, Edge, Firefox, Safari. No installer, no plug-in, no account needed.

No. Files are processed entirely in your browser — nothing is uploaded, stored, or shared. Session data disappears when you close the tab, so download your finished file first. There is no account to leak and no server to breach, because your music never travels.

Yes. The editor reads and writes standard MIDI files (SMF), understood by Ableton Live, FL Studio, Logic Pro, Cubase, Reaper, and the rest. Export here and drag it into your DAW.

No — the four example projects open with no account at all. The free quota only counts sessions with your own files: guests get 1, signed-in users get unlimited editing sessions. The examples are real multi-track MIDI files, so mute, solo, and quantize behave as with your own work.

Quarter, eighth, sixteenth notes, and triplets. Select the notes, pick a grid, and snap loose timing into place with one click. Start with eighth notes for a natural feel; sixteenths for tight electronic timing.

Yes — transpose in one click. Select all notes or a single track and shift everything by semitones without touching the timing. Handy when a singer needs the song a step lower or a loop sits better in a new key.

Type 0 packs every note into a single track; Type 1 keeps parts on separate tracks you can mute, solo, and edit individually. Both open identically in the editor. Most DAW exports are Type 1; most downloaded melodies are Type 0.

Yes — velocity is edited on the piano roll alongside pitch and timing, so dynamics stay under your control.

Only if you download it first — session data disappears when the tab closes, because nothing is stored on a server. Export the finished .mid before you leave — make downloading the last step of every session a habit.

A piano roll is a grid where each note appears as a block — pitch on the vertical axis, time on the horizontal. This midi editor online lets you grab those blocks directly: move, stretch, split, duplicate.

The editor is built for desktop browsers — Chrome, Edge, Firefox, Safari — where precise note editing wants a mouse and a big screen.

Editing runs 100% locally in your browser — once the page is loaded, no network is needed to edit or preview.

Yes — multi-select whole phrases, move them, nudge by semitone, or duplicate them elsewhere. Zoom down to a single bar for fine work. Duplicate a chorus to extend an arrangement in seconds.

Nowhere — there is no cloud save. Your work lives in the browser tab; download the .mid to keep it. If you need versions, download after each milestone and name the files yourself.

Either — select the notes, pick a grid, and snap. Change the grid any time and re-quantize the same selection until the timing feels right.

Yes — mute, solo, rename, and reorder tracks; edit one track while the others play back. Piano, bass, drums, strings — one editable view.