OCR PDF — Free Online Tool

OCR — optical character recognition — is the operation that turns a scanned PDF (which is really just a bundle of page images) into a real text document where words can be selected, searched, and indexed. Without OCR, your scanned contracts are write-only photos. With OCR, they become first-class searchable documents that work in Spotlight, Google Drive, Dropbox indexing, and every modern document management system. Our OCR pipeline uses Tesseract, the open-source recognition engine maintained by Google and trained on hundreds of millions of pages of text in over 100 languages. We render each PDF page at 300 DPI for high accuracy, run Tesseract with the page-segmentation mode optimized for mixed text-and-image content, and produce a searchable PDF where the original page image stays visible while an invisible text layer sits behind it. This dual-layer approach means the document still looks identical to the original (so signatures, stamps, and handwriting stay legible) but now you can highlight, copy, and search text anywhere on the page. Multiple languages can be combined in a single run, so a bilingual document with English on one page and French on the next OCRs correctly. Compared to closed-source alternatives like Adobe Acrobat's OCR feature, Tesseract is on par for Latin scripts and noticeably better for non-Latin scripts (CJK, Arabic, Cyrillic, Devanagari, Thai).