How to Make a Scanned PDF Searchable (OCR)

A scanned document — whether it came from a scanner, a phone camera, or an old fax — is just a picture as far as your computer is concerned. You can't search it, select text from it, or copy a sentence out of it. OCR fixes that.

What OCR actually does

OCR (optical character recognition) looks at the image of each page and recognizes the shapes of letters and words, then adds that recognized text back into the PDF as an invisible, searchable layer sitting exactly on top of the visible scan. The page still looks like the original scan — nothing about its appearance changes — but now there's real, selectable, searchable text underneath it.

This is why OCR is different from just re-typing a document: the visual fidelity of the original scan is preserved exactly, while gaining the functional benefits of a real digital document.

How to OCR a PDF

1. Open OCR — Searchable PDF.
2. Drop in the scanned PDF.
3. Click "Make Searchable." The tool downloads a small OCR engine once per session, then reads through the document page by page.
4. Download the result — visually identical, now searchable.

Larger documents take proportionally longer, since each page is processed individually.

What affects accuracy

OCR accuracy depends heavily on scan quality. Clean, high-resolution scans of standard printed text (a typed letter, a printed form, a book page) get recognized very reliably. Accuracy drops with:

• Low-resolution or blurry scans
• Handwriting (OCR is built for printed text, not handwriting recognition)
• Unusual fonts, tight kerning, or heavily stylized text
• Scans with visible skew, shadows, or folded creases

If a scan is genuinely hard to read with your own eyes, OCR will likely struggle with it too.

What to do after OCR'ing a document

Once a PDF is searchable, you can use Ctrl+F (or Cmd+F) to find text within it in any PDF reader, copy and paste text out of it, or feed it into other tools that need real text — like Extract Text to pull everything into a plain file, or PDF to Word to get an editable document out of it.

FAQ

Does OCR upload my document anywhere? No — the OCR engine (Tesseract, compiled to run in the browser) runs entirely on your device. The only thing fetched over the network is the OCR engine itself, a one-time download unrelated to your file's contents.

What languages does this support? This version is set up for English text recognition.

Can I OCR just one page instead of the whole document? Not directly — split the PDF down to the page you need first with Split PDF, then run OCR on that single-page file.