PDF to PDF

Reprocess and optimize PDF files for improved compression, quality settings, or format normalization. Reduce file size or enhance readability.

Pick the language of the text so the right alphabet is recognised. Automatic recognises the alphabet on each page by itself.

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How OCR Works

Upload a scanned PDF, photo, or image. OCR reads the text from the pixels and turns it into editable characters, in any of 29 languages or with automatic detection. It works best on straight, clear scans; strongly tilted pages or faint text lower the accuracy.

Processing time grows with the number of pages. You get a searchable PDF: the page looks the same, and its text can be searched and copied. Scan quality affects accuracy: clear, straight scans at 300 DPI give the most accurate text.

Why Use OCR?

Scanned documents are just images. You can't search them, copy text from them, or edit them. OCR turns images into actual text. Makes old paper archives searchable. Lets you extract data from scanned forms. Converts printed materials to editable files.

Essential for digitizing contracts, receipts, historical documents, book pages. Screen readers need actual text to read aloud—OCR makes scanned documents accessible. Saves hours versus manual retyping.

Common Uses for OCR

Digitize paper receipts for expense tracking. Convert scanned contracts to searchable Word files. Extract text from old books or newspaper archives. Turn photographed whiteboards into editable notes. Make scanned forms fillable and searchable.

Students photograph textbook pages and extract text for study notes. Lawyers convert scanned case files for keyword search. Accountants digitize invoices and receipts. Researchers extract text from historical documents. Anyone with paper documents that need to become digital.

Frequently Asked Questions About OCR PDF to Searchable PDF

What does OCR PDF to PDF actually do?

OCR (Optical Character Recognition) converts scanned PDF pages—which are just images of text—into searchable, selectable PDFs. The output looks identical to the original but contains a hidden text layer. You can now search for words, copy paragraphs, and use screen readers. The visual appearance stays the same; only the text becomes accessible.

Why make a scanned PDF searchable instead of leaving it as-is?

Scanned PDFs are digital photos—you can't search, copy, or index the text. Searchable PDFs unlock full-text search, allow copy-paste for quotes, enable accessibility features for visually impaired users, and let search engines index the content. For archival, legal, and research documents, searchability is essential. Without OCR, your PDF is a locked image.

Which languages does OCR support?

Pick the document language and the matching recognition model is used: Latin script, Cyrillic, Greek, Arabic, Persian, Devanagari, Chinese, Japanese, Korean or Thai, 29 languages in all. A page holding two alphabets is read in the language you chose, so run it twice if both matter.

How does scan quality affect OCR accuracy?

Clean, high-contrast scans (300 DPI, straight alignment, black text on white) give the best results. Poor scans—skewed pages, faded ink, colored backgrounds, handwriting—produce noticeably more errors. Pre-process scans: straighten pages, increase contrast, remove shadows. Photocopies of photocopies often fail OCR. For critical documents, rescan at 300-600 DPI if possible.

Will OCR increase my PDF file size?

Only slightly: in our test a scanned invoice grew by 0.1% and a scanned bank statement by 4.7%. The searchable PDF is built from the page images plus an invisible text layer, so its size follows the scan rather than the text. If the result is too large to send, run it through Compress PDF; the text layer stays searchable.

How accurate is OCR, and will it make mistakes?

OCR is never error-free: in our test on 10 pages of real scanned Russian documents, the character error rate was 5.6% for a contract and 7.6% for a bank statement with tables, and poor scans or handwriting do worse. Common errors: confusing '0' and 'O', '1' and 'l', or misreading decorative fonts. Always proofread critical documents—contracts, legal filings, academic papers. For high-stakes use, manually verify key numbers, names, and dates. OCR is excellent for bulk archival but not foolproof for precision work.

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