EditMIDIOpen editor

Timing tool

MIDI tempo changer

Set a single project tempo for predictable playback. This rewrites the tempo map at tick zero; it does not stretch or move note tick positions.

Open this MIDI tempo changer tool

The interactive tool loads with JavaScript. MIDI parsing, editing, preview, undo, and download then run locally in your browser.

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What this tool changes

Set a single project tempo for predictable playback. This rewrites the tempo map at tick zero; it does not stretch or move note tick positions.

What stays in the file

Events outside the selected operation remain in the low-level MIDI timeline. An untouched download returns the exact source bytes.

Supported files

Use an SMF Type 0 or Type 1 file with PPQ timing, up to 5 MB and 20,000 events.