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Adding OCR to a .NET MAUI App: Pick an Image, Read the Text, Stay Responsive

Iron Software

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OCR that freezes the UI might as well be broken. Iron Software’s MAUI walkthrough gets recognition working in three lines, then spends the rest of the post on what actually matters on phones: threading, picker streams, and image size.

What you’ll learn

  • The core IronOCR call — IronTesseract + OcrInput + Read/ReadAsync with offline English packs in the NuGet
  • MediaPicker the portable way — read OpenReadAsync() streams instead of fragile FullPath values
  • Keeping the UI alive — ReadAsync, busy indicators, and never calling sync Read from a button handler
  • Downscale before OCR — cap longest edge (~2000px) so mid-range phones stay responsive
  • Platform manifests — Android READ_MEDIA_IMAGES, iOS photo-library usage strings, and packaged Windows caveats

Read the full Medium post for the bindable Editor pattern and where to go next (multi-language, searchable PDFs, structured results).

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