Auto-Harmonizer

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This app reads a single-line MIDI melody, infers chords using Roman numeral analysis, and generates a fully harmonized score with MIDI, MusicXML, and PDF output.
Upload your MIDI
Upload your MIDI (R)
Allowed file types: mid, midi
Max size : 1 MB
Drag and drop files anywhere
Upload
Choose your options
Style (R)
Tempo (R)
Time Signature (R)
Song Title
Composer Name
Harmonize
Ready when you are Free daily runs, unlimited with a free account Usually takes about 10 seconds
Results
Your result will show up here Fill in the steps above and hit the button.
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Help and settings guide

Use this help page to review the required inputs, available settings, generated results, and basic processing expectations before running the app.

How to use

Use the app by completing the required fields, checking any optional settings, and then starting the process.

  1. Prepare your input: Add the files, text, numbers, or choices requested in the form.
  2. Review the settings: Confirm that required fields are filled in and optional settings match the result you want.
  3. Run the app: Click the Harmonize button and wait for Melobytes to process your request.
  4. Save the result: Use the result links or previews shown on the page after processing is complete.
Input data
Upload your MIDI Upload the source file used by the app. Accepted file types: .mid, .midi. Maximum file size: 1 MB. Required.
Style Choose a value for this setting. Available options: Pop / Happy, Sad / Minor, Jazz, Cinematic. Required. Default value: Pop / Happy.
Tempo Choose a value for this setting. Available options: 60 to 255. Required. Default value: 120.
Time Signature Choose a value for this setting. Available options: 2/4, 3/4, 4/4, 5/4, 6/4, 7/4, 8/4, 9/4. Required. Default value: 4/4.
Song Title Enter the requested text value. Optional.
Composer Name Enter the requested text value. Optional.
Tip: Required fields must be completed before processing. For best results, use clear source material, choose the closest matching language or music setting, and keep uploaded files within the listed limits.
Output

When the process finishes, the app shows the available result items on the page.

  • Download MIDI — MID
  • Download PDF score — PDF
  • Download MusicXML — MUSICXML

Typical processing time is about 60 seconds, although larger inputs or busy periods can take longer.

Trial limits may apply according to the current Melobytes account settings.



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