What this tool changes
Add controlled timing and velocity variation to stiff MIDI. Choose a maximum offset, a variation seed, and whether drums should move, then preview and undo as one edit.
Bounded variation
Humanize MIDI
Add controlled timing and velocity variation to stiff MIDI. Choose a maximum offset, a variation seed, and whether drums should move, then preview and undo as one edit.
Local file processing
1 Open2 Edit3 Preview4 Undo if needed5 Download
Open a MIDI file
Stay on-device. Start empty if you have no file, or try a public demo.
Off-grid notes, wild velocities, leftover gaps — the dirty AI-song export producers actually get.
A clean four-bar piano phrase you can transpose, quantize, or reshape immediately.
Drums, bass, and chords on separate tracks for mute, solo, and merge practice.
The same hook after quantize and velocity cleanup — the after shot for the messy export.
Your file stays on this device unless you explicitly use Creator Cloud. After an edit, one local recovery copy is saved in this browser until you replace or clear it.
Creator Cloud
Keep the versions and extend the phrase.
Creator Cloud adds cloud history and reviewed AI MIDI edits a month. The tool you are using stays free.
- 60 reviewed AI MIDI edits each month
- 50 cloud projects with 100 versions each
- Cancel anytime; the free editor stays free
What stays in your MIDI
Events outside the selected operation remain in the low-level timeline. Downloading before any edit returns the exact source bytes.
Drop the export into a DAW
- Download the edited file. The name starts with editmidi- so it is easy to spot in a DAW project.
- In FL Studio, Ableton, or Logic, create or open a MIDI track and import that .mid onto the clip or arrangement.
- Audition the destination instrument. MIDI is instructions, so the sound comes from the synth you attach in the DAW.
What humanize changes
Each note gets a small timing offset and a small velocity offset. The timing change moves the note start and keeps the original duration, so the note does not shrink or stretch. The velocity change applies to the note-on value and stays inside the MIDI range.
The offsets are bounded by the values you choose. A timing range of eight ticks is a very small nudge; a range of 120 ticks can be a noticeable push or pull depending on the PPQ. The velocity amount works the same way, with a maximum of 64.
Why the seed matters
The variation is deterministic. The note ID and seed produce the same offsets every time, so you can compare two versions without rerolling the whole file. Change the seed to get a different groove, or keep it to reproduce a result you liked.
Drum channel 10 is excluded by default because moving percussion hits can change the groove in ways that are hard to undo by ear. Enable it only when you actually want the drum lane to move.
Use it after quantize, not instead of it
A common workflow is to quantize first, then humanize a small amount so the timing is consistent but not mechanical. If the source already has a good performance, humanizing again can make it sloppy; use a small range and compare short loops.
The operation is one undoable edit. If the result feels wrong, Undo restores the exact previous timing and velocity. Download MIDI writes a separate file, leaving the source file available for comparison.
What it cannot recreate
Humanize adds variation; it does not add articulations, swing, microtonal pitch, or the expressive timing of a real performer. It also will not fix wrong notes or a bad groove. Those need editing, a different performance, or a different MIDI source.
The file stays local. Program changes, controllers, pitch bend, tempo maps, and track order remain in the document; only note starts, note ends, and note-on velocities are touched.
Keep the same fileAll EditMIDI tools
Open the full index
Every page runs on the same browser MIDI engine, so you can move between them without uploading or re-importing your file.
- MIDI editor online — edit notes, tracks, and velocity in the browser
- MIDI player online — preview tracks, scrub, and loop without uploading
- Transpose MIDI online — change key without losing tempo or controllers
- Change MIDI BPM online — replace a tempo map with one steady value
- Quantize MIDI online — snap note starts and ends to a musical grid
- MIDI velocity editor — set note dynamics from 1 to 127
- MP3 to MIDI converter — turn a melody into an editable piano roll
- Audio to MIDI — sketch one melody from a local recording
- Suno MIDI cleanup — quantize and fix messy AI exports
- MIDI to MP3 — render a MIDI file to WAV or MP3 in this browser
- Piano roll viewer — see every note, pitch, and length in a .mid file
- WAV to MIDI converter — draft notes from an uncompressed recording
- Vocal to MIDI — turn a hummed or sung line into editable notes
- MIDI key finder — estimate the key, relative key, and Camelot code
- Merge MIDI files — combine two .mid files into one multi-track project
- MIDI file checker — inspect structure, channels, tempo, and compatibility risks
- MIDI duration calculator — read seconds, bars, beats, and tempo points
- MIDI to CSV — export one row per note for a spreadsheet
- MIDI to JSON — export a versioned structured note object for apps and AI
- MIDI to video — record a vertical, square, or widescreen piano-roll clip
- MIDI cover art generator — export a 1500px PNG from the note pattern
- MIDI velocity curve — reshape dynamics with a gamma curve
- MIDI note length editor — make notes shorter, legato, or staccato
- MIDI to WAV — render uncompressed 44.1 or 48 kHz audio locally