What does OCR actually do to my scanned PDF?

It analyzes the scanned image on each page, recognizes the text characters it contains, and adds an invisible text layer positioned exactly over the corresponding words in the image — the page still looks like the original scan, but the text is now selectable, searchable, and copyable.

Does this work for languages other than English?

Yes, a range of languages are supported — select the correct one before processing for the best accuracy, since recognition models are language-specific.

How accurate is the text recognition?

Accuracy depends on scan quality — clean, high-resolution scans of typed text typically recognize very accurately, while low-resolution scans, handwriting, or unusual fonts reduce accuracy. This tool uses a genuine OCR engine (Tesseract), the same open-source engine widely used in production document-processing software.

Will the visual appearance of my scanned pages change?

No, the original scanned image remains exactly as it was — OCR adds an invisible text layer on top, it doesn't alter or replace the visible page content.

Does OCR processing require an internet connection?

The recognition itself runs locally in your browser. The language data for your selected language downloads once on first use (not your file — just the recognition model), after which it's cached for reuse.

Can I search the resulting PDF in a normal PDF viewer afterward?

Yes, the output is a standard PDF with a real text layer — Ctrl+F search, text selection, and copy-paste all work in any standard PDF viewer, not just this site.

Is my file uploaded to a server?

No. The scanned file itself is never uploaded — only the OCR language model data (not your file) is fetched from a CDN the first time you use a given language, so the recognition engine can run locally afterward.

OCR PDF

Turn scanned PDFs into searchable, selectable text using real optical character recognition.

Processed entirely in your browser — your file is never uploaded anywhere.

Why OCR your PDFs with Tools Root

A scanned document — a paper form, an old book, a faxed contract — is just a picture of text as far as a computer is concerned, until OCR recognizes the actual characters. That's what makes the difference between a file you can only look at and one you can search, copy from, and reference by keyword.

Real, self-hosted OCR, not a placeholder

This uses Tesseract, a genuine open-source OCR engine trusted in production document pipelines, running as a self-hosted WebAssembly build. Recognition happens on-device — the only network activity is a one-time download of language recognition data (not your document) the first time you use a given language.

Common use cases

Making an old scanned contract searchable by keyword, digitizing a stack of paper forms into a searchable archive, recovering selectable text from a faxed document, or preparing a scanned research paper so quotes can be copied directly instead of retyped.

How to OCR a scanned PDF

1Upload your scanned PDF.
2Choose the document's language for accurate text recognition.
3The tool runs on-device optical character recognition on every page.
4Download a new PDF with an invisible, searchable, selectable text layer over the original scan.

Frequently asked questions

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