*Note:* Long notes end with **Type 2 (Red)**. Sections with **9 notes in 4 beats** will be **Type 3 (Yellow)**. If alternating, **Type 1 is forced Left, Type 0 is forced Right**.
Controls the horizontal spread of notes (from -X to +X).
Disclaimer: This is a simple converter. It maps MIDI pitch to grid position. The output is a starting point, not a finished, playable map. You'll need to paste this data into the editor and arrange the notes to be fun!
Output JSON
How to Create a Custom Synth Riders Beatmap Foundation
Follow these quick steps to generate the base JSON data for your custom song map:
Upload Your MIDI: Use the "Upload MIDI File" button (step 1) to select your .mid file.
Select & Assign: Choose the desired MIDI Track (step 2) and map the note types to the correct hand assignments (Left/Blue, Right/Red, Both/Yellow) in step 3.
Set Density & Convert: Select your desired rhythm simplification (Quantize, step 4) and time spacing (Time Resolution, step 5). Finally, click the Convert button.
Copy & Edit: Copy the resulting JSON data from the output box and paste it into the official Synth Riders editor to refine and complete your playable beatmap!
Note: This tool provides the foundation—you will need the official editor to adjust positions and make the map fun and playable!