PDF guides
How to Make a Scanned PDF Searchable (OCR PDF)
OCR PDF adds a real, selectable text layer to a scanned or photographed PDF, directly in your browser. This walks through the exact steps, what the tool does automatically, and what to expect from the finished file.
Ready to try the tool this guide describes?
Before you start
OCR PDF accepts PDFs up to 50 MB and 25 pages. It is English-only in this version — there is no language selector, because the underlying engine is only loaded with English recognition data.
Step-by-step
- Choose or drag a PDF file into the tool.
- Select "Make searchable & download."
- The tool reads every page and decides, page by page, whether it already has real text or needs recognition.
- Pages that need it are recognized in the background — the browser tab stays responsive while this runs.
- The finished PDF downloads automatically once every page has been processed.
What happens to pages that already have text
A page with a substantial amount of real, extractable text is left completely untouched — no rasterization, no recognition, no new text is added to it. This matters for a common real-world case: a PDF where most pages are normal text but one or two pages are inserted scans (a signed form, a stamped page). Only the scanned pages get processed.
Reading the summary after a run
After a successful run, the tool reports how many pages were actually recognized versus left unchanged, plus an average confidence score for the pages that were processed. A low average confidence is a signal the source scan quality was poor — see the companion guide on OCR accuracy for what typically causes that.
How to OCR a Scanned PDF FAQ
- Do I need to tell the tool which pages are scanned?
- No. Every page is checked automatically, and only pages that look scanned or mostly image-based are recognized.
- Is my PDF uploaded anywhere?
- No. Recognition runs locally in your browser. The only network request involved is a one-time, same-origin download of a small language file the first time you use the tool — never your document.
- Can I select and copy the recognized text afterward?
- Yes. The recognized words are embedded as real, selectable PDF text, so you can select, copy, and search them in any standard PDF viewer.
- Will the page still look like a scan?
- Yes — visually, nothing changes. The recognized text is invisible; only its presence in the file changes, not the appearance of the page.
- What if the PDF has more than 25 pages?
- It is rejected before processing starts, with a message suggesting Split PDF to break it into smaller files first.
- Does this work on a PDF that is already fully text-based?
- Yes, but nothing changes — every page will be classified as already having text and left untouched.
Related guides
- How OCR Text Layers WorkThe technical mechanism behind an OCR’d PDF: why the page still looks like a photograph while the text underneath becomes searchable and selectable, and what an invisible text layer actually means.
- What Affects OCR AccuracyWhat actually determines OCR accuracy — resolution, skew, contrast, and language — plus the real limits of Looty Tools' English-only, 25-page OCR engine and how to get better results from a poor scan.
