How to OCR a scanned PDF
Upload a scanned PDF that contains image-only pages.
Click Run OCR in the right sidebar.
Wait for the browser to process each page with Tesseract.js.
Review the detected OCR words overlaid on the document.
Double-click any word to correct it inline.
Open the OCR Fix sidebar to review all low-confidence words at once.
What to expect
OCR creates editable overlays from scanned text regions.
Edits on scanned pages cover the original image area and draw new text.
OCR quality depends on scan resolution, language, and document noise.
Low-confidence words are flagged automatically for review.
Private by design
OCR runs entirely in your browser using Tesseract.js. No page images are uploaded to any server.
CrabPDF is experimental. Always verify important documents after OCR and editing.