How to Convert Sheet Music to MIDI [Free & Browser-Based]

What Does "Convert Sheet Music to MIDI" Really Mean?

Most people searching for ways to convert sheet music to MIDI have one goal in mind: take a physical score or an image of sheet music and turn it into MIDI data they can edit and play back in a DAW — without having to enter every note by hand. Whether it's a scanned page or a photo you took on your phone, the idea is simple: skip the tedious manual input and get a MIDI file straight from the image. That's exactly what this guide covers.

By the end of this article, you'll understand how sheet music-to-MIDI conversion works (optical music recognition), which free and paid tools are available, step-by-step instructions, tips for better accuracy, and how to fix common mistakes. We cover everything from no-install browser tools to full-featured desktop software.

How Sheet Music-to-MIDI Conversion Works: Optical Music Recognition Explained

Converting sheet music to MIDI relies on a technology called OMR (Optical Music Recognition). Just as standard OCR reads text from an image, OMR reads notes, rests, time signatures, key signatures, dynamics, and other musical symbols from a score image and turns them into digital data.

How OMR Processes a Score

1. Image pre-processing: Deskewing, noise removal, and binarization (converting to black and white)
2. Staff line detection: Identifying horizontal lines to locate each system on the page
3. Symbol recognition: Using AI to identify noteheads, stems, dots, accidentals, and other markings
4. Musical structure analysis: Inferring measures, beats, voices, and key from context
5. Export to MIDI or MusicXML: Outputting the recognized data in a format any DAW can read

Recent deep learning-based models — such as oemer and technology from Google Magenta — have dramatically improved accuracy, even for handwritten scores.

Sheet Music to MIDI Tools Compared [2024]

Here's a breakdown of the major tools organized by use case.

① Browser-Based Tools (No Install Required)

• LA Studio (LEGATO AI): Upload a sheet music image and the converted MIDI is placed directly into an in-browser DAW editor as a MIDI region. No extra software needed — convert, edit, play back, and export all in one tab.
• SmartScore Online: Focused on converting PDF scores to MusicXML. Subscription-based.
• MuseScore (cloud version): Supports MusicXML and MIDI output, primarily through its own notation format.

② Desktop Applications

• Audiveris: Open-source OMR engine. Free and powerful, but requires some technical setup. Outputs MusicXML, which you then convert to MIDI.
• SmartScore 64: Windows/Mac. Commercial-grade accuracy. Paid software (starting around $300 USD).
• SharpEye Music Reader: A veteran app focused on MIDI output from scanned scores. Windows only.
• PhotoScore Ultimate (Sibelius integration): Made by Avid. Works best as a companion to Sibelius.

③ Converting MusicXML to MIDI

Many OMR tools output MusicXML rather than MIDI directly. MusicXML is a W3C standard format that preserves more musical detail than MIDI. You can convert MusicXML to MIDI using free tools like MuseScore, or paid software like Sibelius or Finale.

[Step-by-Step] Converting Sheet Music to MIDI with LA Studio's LEGATO AI

Here's how to use the sheet music OCR feature in LA Studio (powered by LEGATO AI) — the fastest no-install option that takes you from image upload to DAW editing in a single browser window.

Step 1: Open the LA Studio Editor

Go to https://la-studio.cc/editor in your browser. No account registration or software installation is required. Works best in Chrome or Edge (WebGPU-enabled browsers recommended).

Step 2: Launch the Sheet Music OCR Tool

1. From the menu at the top of the editor, select LEGATO AI (Sheet Music OCR).
2. Drag and drop your sheet music image (PNG, JPG, or PDF) into the upload area, or choose a file via the file picker.

Step 3: Run the Conversion

1. Click Start Conversion. The AI will analyze your score and finish processing in a few seconds to under a minute.
2. A preview of the recognized result will appear. Check that note positions, durations, and time signatures look correct.

Step 4: Import the MIDI Region into the Editor

1. Click Insert into Editor and the converted MIDI data will be automatically placed as a track in the piano roll.
2. Open the piano roll to manually fix any notes, then assign an instrument (e.g., Salamander Grand Piano) and hit play to verify.
3. Use the Export menu to download a standard MIDI file (.mid) — compatible with Cubase, Logic Pro, Studio One, and any other major DAW.

Note: LEGATO AI uses a credit-based Pro plan. You can try it with the free credit allowance first, and upgrade to Pro if you want to continue.

Tips for Better Sheet Music Images (and Higher Accuracy)

OMR accuracy is heavily dependent on image quality. Use this checklist before uploading.

Scanning Best Practices

• Scan at 300 dpi or higher: Below 200 dpi, noteheads become too blurry to recognize reliably
• Scan in grayscale or black and white: Higher contrast than color scans, which helps recognition
• Use a flatbed scanner, not an ADF: Auto-feed scanners often introduce skew that hurts accuracy
• Scan one page at a time: Scanning a two-page spread creates a shadow in the center that causes misreads

Smartphone Photography Tips

• Shoot directly overhead — avoid angles that cause trapezoidal (keystone) distortion
• Use natural window light or even overhead lighting to avoid shadows
• Pre-process your photo with an app like Adobe Scan or Microsoft Lens before uploading — these apps automatically correct perspective and enhance contrast
• Tap the score to lock focus before shooting

Score Condition

• Handwritten scores typically yield 20–30% lower accuracy than printed ones. Clean them up or transcribe them into notation software before converting if accuracy matters
• Scores with heavy annotations or erased markings benefit from a quick cleanup in an image editor (remove stray lines) before processing
• For long scores, split them into batches of a few pages at a time

Working with Converted MIDI in Your DAW

Getting the MIDI file is only half the job. Here's how to make the most of it afterward.

Quantization and Note Correction

MIDI exported from OCR may have slight timing inconsistencies. Applying quantization (snapping notes to the nearest 8th or 16th note grid) in your DAW's piano roll will clean things up quickly. In LA Studio's piano roll, you can adjust the snap setting from the menu and fix individual notes visually.

Assigning Sounds

Converted MIDI often defaults to a General MIDI piano patch. For serious production, swap it out for a better sound source — LA Studio supports plugin synths like Surge XT and Vital, while other DAWs can use sampler instruments like Kontakt or HALion.

Preserving More Detail via MusicXML

If you need dynamics (forte, piano, crescendo), articulations (staccato, slurs), or tempo changes to carry over, go the MusicXML route instead of straight MIDI. Import the MusicXML into MuseScore (free), make any edits, and export to MIDI with all that information intact.

When to Use Audio-to-MIDI Instead

If you're starting from an audio file (MP3, WAV, etc.) rather than a sheet music image, you want audio-to-MIDI conversion — not OMR. LA Studio includes a browser-based Basic Pitch (ONNX) audio-to-MIDI feature that transcribes recorded vocals or instruments directly into a MIDI track. Use this when you want to MIDI-fy a song you don't have the sheet music for.

Use Case Guide: Sheet Music Digitization for Different Goals

Case 1: Turning a Piano Piece into a DAW Project

Sheet music OCR → LA Studio MIDI editor → Preview with Salamander Grand Piano → Export MIDI. This is the fastest route. It's also easy to loop specific measures or slow down the tempo for practice.

Case 2: Extracting Individual Parts from a Band Score

Scan each instrument's part separately, run OCR on each, and place them on separate tracks in your DAW. If you want guitar parts to remain as tab notation rather than MIDI, consider a dedicated tool like Guitar Pro.

Case 3: Digitizing Your Own Handwritten Compositions

Photograph your handwritten draft → convert via sheet music OCR → clean up in the piano roll. Far faster than entering every note from scratch. If handwriting recognition is unreliable, transcribe into MuseScore first and then convert.

Case 4: Creating MIDI from Public Domain Classical Scores

IMSLP (the Petrucci Music Library) offers thousands of public domain scores as free PDFs. Download a Bach or Beethoven score, run it through a sheet music OCR tool, and you have a high-quality MIDI file. IMSLP hosts over a million scores.

Frequently Asked Questions

Q. Can I convert handwritten sheet music?

A. Yes, but accuracy will be lower than with printed scores. Pencil smudging, eraser marks, and unconventional note shapes all increase misreads. For best results: ① scan at 400 dpi or higher; ② crop and adjust contrast after scanning; ③ manually correct notes in the piano roll after conversion. Think of it as a head start, not a perfect result.

Q. Can I convert a multi-page score all at once?

A. It depends on the tool. Some tools (SmartScore, Audiveris) accept multi-page PDFs in one upload. LA Studio's LEGATO AI processes one page at a time, so you'd convert each page separately and merge the resulting MIDI regions in the editor.

Q. Can I use the exported MIDI in Cubase or Logic Pro?

A. Absolutely. The MIDI file format (.mid) is a universal standard supported by every major DAW, including Cubase, Logic Pro, Studio One, Ableton Live, and FL Studio. Files exported from LA Studio work the same way.

Q. How accurate is the conversion? What if it gets things wrong?

A. With a clean printed score scanned at 300 dpi or higher, modern AI-based OMR tools typically get 80–95% of notes right. If accuracy is low: ① improve image quality; ② try a different OMR tool; ③ manually fix errors in the piano roll. Think of OCR as handling the bulk of the data entry while you handle the cleanup — that's the realistic workflow.

Q. Can I get MusicXML output instead of MIDI?

A. Yes. MusicXML preserves more musical information than MIDI — dynamics, articulations, tempo markings, and so on. Tools like Audiveris, SmartScore, and PhotoScore output MusicXML by default. From there, open the file in MuseScore (free) to export as MIDI, or import directly into a notation-aware DAW like Dorico or Sibelius.

Summary: Image Quality and Tool Choice Are the Keys to Success

Here's what to take away from this guide:

• Sheet music-to-MIDI conversion uses OMR (Optical Music Recognition): AI reads notes and symbols from an image and outputs MIDI or MusicXML
• 300 dpi or higher, no skew, no shadows — these are the non-negotiable requirements for good accuracy
• For a no-install solution you can try right now, LA Studio's LEGATO AI handles conversion and DAW editing in a single browser tab
• For maximum accuracy and features, desktop tools like SmartScore 64 or Audiveris are worth considering
• Going through MusicXML preserves dynamics, tempo changes, and articulations that plain MIDI can't carry
• Budget time for manual cleanup in the piano roll — treating OCR as "90% done" rather than "fully automated" leads to much better results

Digitizing sheet music opens up a world of possibilities: composing, arranging, practice tools, and archiving. Start with one page from something you already have on hand and see how far you get.