How to OCR a PDF Free — Make a Scan Searchable
September 20, 2026 · 5 min read
A scanned PDF is a stack of photographs. You can see the words, but your computer can't: Ctrl+F finds nothing, you can't copy a paragraph, and the file is invisible to search. OCR — optical character recognition — reads those pictures and works out what the letters say.
The good version of OCR doesn't change how your document looks. It leaves the scan exactly as it is and adds an invisible layer of text on top, lined up with the words in the image. The page looks identical; it's just become searchable.
How to OCR a PDF
- Open RizzPDF OCR PDF
- Drop in your scanned PDF — it tells you whether the file already has real text
- Pick the pages and the language of the document
- Wait while each page is recognised (a second or two per page)
- Download the searchable PDF, or the plain text as a .txt file
Why "no upload" matters here
Think about what people actually scan: passports, bank statements, medical letters, signed contracts, tax paperwork. Most free OCR sites upload that to a server, process it there, and hold a copy for some period described in a privacy policy you didn't read.
RizzPDF runs the recognition inside your browser tab. The scan never leaves your device, so there is no copy to delete, no retention window, and nothing to breach. The only thing downloaded is the language model that does the reading.
What OCR reads well — and what it doesn't
| Type of page | How it goes |
|---|---|
| Flatbed scan of printed text | Excellent — close to perfect on a clean 300 DPI scan |
| Phone photo of a document | Good, if it's flat, sharp and evenly lit |
| Faxed or heavily compressed scan | Mixed — expect to correct some words |
| Handwriting | Poor. OCR is built for printed type, not cursive |
| Dense tables and forms | Words are read correctly, but the layout isn't preserved |
Get a better result: scan settings that matter
- 300 DPI is the sweet spot. Below 200 the letters break up; above 400 you gain little and wait longer.
- Straighten the page. A few degrees of rotation costs real accuracy — OCR reads along horizontal lines.
- Even light, no shadow. A shadow across the gutter of a book is the most common cause of garbled words.
- Grayscale beats colour for plain text, and produces a smaller file.
Does OCR change my scan?
It shouldn't, and in RizzPDF it doesn't. Your pages keep their original resolution, size, rotation and crop — a 300 DPI archival scan stays a 300 DPI archival scan. The file grows only by the size of the text layer. Some tools rebuild every page as a fresh, lower-resolution image, which quietly degrades the document you were trying to preserve.
Is it free?
Free for the first 10 pages of any document, with no account and no watermark. Longer documents need Pro at $5 a month, which is what pays for the tools everyone else uses for free. Every other single-file tool on RizzPDF is free and unlimited.
After OCR: what you can suddenly do
- Find any clause in a 40-page contract with Ctrl+F
- Copy a paragraph out of a scanned letter instead of retyping it
- Let your computer's search index find the file by its contents
- Convert it to Word — PDF to Word needs real text to work with
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