OCR PDF
Adds an invisible text layer to scans so you can search, select and copy text. Only useful for scanned (image-based) PDFs — on a normal PDF whose text is already selectable, OCR is not needed and will make the file larger.
About OCR PDF
OCR PDF reads the text in a scanned PDF and adds an invisible text layer on top of the page images. The document looks the same, but you can now search it, select words and copy text.
OCR is only needed for scans and photos of documents. A normal PDF whose text can already be selected does not need it, and running it anyway makes the file larger.
When to use OCR PDF
- Search for a name or number inside a scanned contract.
- Copy text out of a scanned page instead of retyping it.
- Make an archive of scanned documents searchable.
Tips for the best result
- Choose the language the document is written in: it makes recognition much more accurate.
- Leave the mode on "Only read scanned pages" so pages that already contain text are left alone.
- Clear, straight, well-lit scans give the best results: blurry or tilted scans lose accuracy.
How to use OCR PDF online
- 1
Upload your file
Choose a PDF file or drag and drop it onto the page.
- 2
Choose your options
Adjust the settings if you need to, or keep the sensible defaults.
- 3
Run OCR PDF
Click the button and the file is processed on our secure server in seconds.
- 4
Download the result
Download your new file. Your upload and the result are deleted automatically afterwards.
Read the full guide: How to Make a Scanned PDF Searchable with OCR (Free, Online) →
Frequently asked questions
How do I know if my PDF needs OCR?
Try to select a word with your mouse. If you cannot highlight individual words, the page is an image and OCR will help. If you can, it already has real text.
Why is the OCR result larger than my original?
OCR adds a text layer to the file, and re-reading every page can also re-encode the images. Use the default mode and only run it on real scans.
Is OCR PDF free?
Yes. You can use OCR PDF on SnapPDF for free, without creating an account. Paid plans only raise the limits for heavy use.
How do I use OCR PDF?
1. Upload your file. 2. Choose your options. 3. Run OCR PDF. 4. Download the result.
Are my files safe?
Yes. Files are sent over HTTPS, stored encrypted, visible only to you, and deleted automatically after processing. We never sell your files or use them to train AI.
Do I need to install any software?
No. OCR PDF works in any modern browser on Windows, Mac, Linux, Android and iPhone.
Which file types are supported?
OCR PDF accepts PDF files.
What else can I do with SnapPDF?
SnapPDF has more optimize pdf tools and many others to merge, split, compress, convert, edit and secure PDFs.