mp3frommidi.com · evidence-led route test

Sheet Music to MIDI: What I Could Reproduce

Short answer: This run parsed the downloaded Image to MIDI file against the four source pitches: 0 matched, 196 extra note-on events were outside the source set, and 4 source pitches were missing. Lacuna returned an internal error; PureMIDI upload attempt reached “Opening the file picker...” but no file entered the control in the in-app browser (2026-10-16) — 未取得 MIDI.

This page covers the sheet-music-to-MIDI intent, including music score, PDF, scan, photo, picture and image wording. The input was created for this test; it is not a copyrighted score.

Test matrix

Input	Observed result	Output
Printed score PNG	Input SHA-256 differs; this route returned no MIDI in this run	196 parsed note-on events; 0 matches, 196 extra, 4 missing; output SHA-256 CD8BBC565FEE5767F783BC0E78DD1D61F1CD6AA2BA1AA355729F595DEE56FA18
Simulated scan PNG	Input SHA-256 differs; this route returned no MIDI in this run	196 parsed note-on events; 0 matches, 196 extra, 4 missing; output SHA-256 CD8BBC565FEE5767F783BC0E78DD1D61F1CD6AA2BA1AA355729F595DEE56FA18
Simulated phone-photo PNG	Input SHA-256 differs; this route returned no MIDI in this run	196 parsed note-on events; 0 matches, 196 extra, 4 missing; output SHA-256 CD8BBC565FEE5767F783BC0E78DD1D61F1CD6AA2BA1AA355729F595DEE56FA18

Source-to-output count: The self-created source score has 4 notes — C4, E4, G4 and C5. The downloaded MIDI contains 196 parsed note-on events. Against source pitches C4, E4, G4 and C5, the parsed comparison is 0 matches, 196 extra events and 4 missing source pitches. These are parsed event comparisons, not accuracy or success rates.

Result of the hash check: the three input PNG fingerprints are different, but all three downloaded MIDI files have the same SHA-256 fingerprint and the same 1,959-byte length. This route therefore did not distinguish the three inputs in this run. The earlier three success rows are withdrawn. The 196 note-on count is a parsed event count for the downloaded file, not an accuracy or success rate.

Input fingerprints: printed-score.png C23AB001C00D660DBE8F66167E23749682EE21A369BDBD6F186847C20062B685; scanned-score.png 5F922D8707940FB6A372EC284765F4EB48FC280C0D6BA9831A036070AEB73513; phone-photo-simulated.png E2B8B5AED71B7C498A4B05DAB7D66B32BF0387B38746BC7218C755B7D7810D54. Output fingerprint for all three: CD8BBC565FEE5767F783BC0E78DD1D61F1CD6AA2BA1AA355729F595DEE56FA18.

Three-route comparison matrix

Input	Image to MIDI	Lacuna	PureMIDI
Printed score PNG	196 note-on events; output SHA-256 CD8BBC565FEE5767F783BC0E78DD1D61F1CD6AA2BA1AA355729F595DEE56FA18	An internal error interrupted this task. Try again. (2026-10-16) — 未取得 MIDI	PureMIDI upload attempt reached “Opening the file picker...” but no file entered the control in the in-app browser (2026-10-16) — 未取得 MIDI
Simulated scan PNG	196 note-on events; same output fingerprint	An internal error interrupted this task. Try again. (2026-10-16) — 未取得 MIDI	PureMIDI upload attempt reached “Opening the file picker...” but no file entered the control in the in-app browser (2026-10-16) — 未取得 MIDI
Simulated phone-photo PNG	196 note-on events; same output fingerprint	An internal error interrupted this task. Try again. (2026-10-16) — 未取得 MIDI	PureMIDI upload attempt reached “Opening the file picker...” but no file entered the control in the in-app browser (2026-10-16) — 未取得 MIDI

Route status

Route	Access result	Output
Lacuna	The route returned its recorded status text; no MIDI was obtained	Not run; no MIDI output to parse
PureMIDI	PureMIDI upload attempt reached “Opening the file picker...” but no file entered the control in the in-app browser on 2026-10-16; no MIDI was obtained	Not run; no MIDI output to parse

Reproduce the boundary check

Download the PNG fixture.
Open Image to MIDI, choose the image, and click Generate MIDI.
Download the result as image2midi-output.mid. The downloadable SVG source shows how the fixture was made.

Boundary: The MIDI event count above is this downloaded file’s parsed note-on count, not an accuracy percentage. I did not claim that the generated notes sound correct because I did not independently audition the file in this run.

What was actually free

Image to MIDI produced a downloadable MIDI file for this run. Lacuna returned the recorded internal-error text and no MIDI. PureMIDI upload attempt reached “Opening the file picker...” but no file entered the control in the in-app browser on 2026-10-16; no MIDI was obtained. No route result here is presented as an accuracy or success rate.

What this site does

The mp3frommidi.com converter is an audio-to-MIDI tool for recordings. It does not perform optical sheet-music recognition. The table above is a separate route test for sheet images.

Evidence files

Sheet music maker checks

Short answer: Check the input route, export format, and stated limits before treating a sheet music maker result as a faithful score.

How should I check a sheet music maker?

Record whether the source was typed notes, a scan, a photo, MIDI, MusicXML, or audio. Record the tool and plan state, export the result, and compare it with the source. Verify input format, output format, login, batch behavior, and limits on the exact tool page.

For the sheet music generator input answer and the recorded fixture table, see Sheet Music Generator: What Inputs Can It Actually Use?.

Conclusion

This run found an input-consumption boundary: three distinct PNG fingerprints produced one identical MIDI fingerprint. It does not establish an accuracy rate or success rate.