WrenPDF

OCR PDF

Recognise the text in scanned PDFs and photos: get a searchable PDF and copyable text. Six languages, and your file never leaves your browser.

What it does

PDFs from a scanner or phone camera are really just pictures: you cannot search them or copy their text. This tool recognises the writing on each page and gives you two things: plain text you can edit and copy, and a PDF that looks exactly the same but is now searchable.

Recognition runs on the open-source Tesseract engine entirely in your browser. Even the language data loads from this site, so scans of contracts, IDs or medical letters are never sent to a server. Language data downloads once on first use and is read from your device after that.

How to use it

  1. Drop a scanned PDF or photos.
  2. Pick the document language and accuracy.
  3. Press "Recognise text", then copy the text or download it as .txt or a searchable PDF.

When is it useful?

  • Finding a clause in a scanned contract with Ctrl+F
  • Copying a quote from a photographed page
  • Making an archive of old scans searchable
  • Adding a text layer before editing a scan with PDF → Word

Tips

  • Straight, well-lit, sharp scans give the best results; fix sideways pages with Rotate PDF first.
  • For small or faint print, choose High accuracy.
  • If a document mixes two languages, select the second one too.

Frequently asked questions

What is OCR?
Optical character recognition: it turns the writing in a scanned page or photo into text you can read, search and copy.
Will my scanned PDF look different?
No. The page image is untouched; the recognised text is added on top as an invisible layer. The file looks the same but is now searchable and its text can be selected.
Which languages are supported?
English, Turkish, Spanish, Portuguese, French and German. For mixed documents you can add a second language.
Is my file sent to a server?
No. Recognition happens entirely in your browser; everything, including language data, loads from this site and your file never leaves your device.
How accurate is it?
Very high on clean, straight scans of printed text. Errors increase with blurry photos, handwriting and very small print; use High accuracy for those.
Does it read handwriting?
It is built for printed text. It partly works on neat block capitals, but results on joined-up handwriting are not reliable.
How long does it take?
It depends on your device; on a recent computer it is a few seconds per page. For long documents, pick a page range to recognise only the pages you need.

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