How to make a scanned PDF searchable
Turn a scanned PDF into searchable, selectable text with OCR. Learn how to prepare, convert, check, and use the result online.
You can make a scanned PDF searchable and selectable by running OCR (optical character recognition). OCR analyzes the image of each page, identifies the characters, and adds a text layer so you can search, highlight, and copy text while keeping the scanned page visible.
- Start with the clearest scan available. Sharp, upright pages with good contrast give OCR more information to recognize. If pages are sideways, rotate the PDF before processing.
- Use specific searches to check the result. Search for a name, heading, or distinctive phrase you can see on the page. Then try selecting and copying a short sentence into a plain-text field.
- Review important text against the page image. OCR can misread faint printing, unusual fonts, handwriting, stamps, tables, or marks. Check names, dates, amounts, and other details that must be exact.
Choose the right approach
- Pages are scans and no text can be selected → Run OCR with Readable PDF to create a searchable PDF. Recognition may need checking.
- Pages are sideways or upside down → Rotate them, then run OCR. Adds a preparation step.
- Text is already selectable but hard to find → Try PDF search first. OCR will not fix unclear wording.
- You need to change the wording or layout → Extract or retype the needed content after OCR. A searchable PDF is not the same as an editable source document.
Steps to make a scanned PDF searchable
1. Open the free Readable PDF tool on CompanionPDF.
2. Upload the scanned PDF.
3. Process the file and download the searchable version.
4. Open the downloaded PDF and search for text visible on a page.
5. Select and copy a short passage to confirm that the text layer works.
6. Compare critical copied text with the original scan before relying on it.
The decision is simple: use OCR when the document is image-only and you need to find or reuse its words. Keep the original scan as your visual reference, especially when the document contains information where a recognition mistake matters.
Where CompanionPDF fits
CompanionPDF offers a free Readable PDF tool that turns scanned PDFs into searchable text with free OCR. Its tools use the same upload, process, and download flow, with no account or payment required. Files are deleted right after download.
Related tools for scanned files:
FAQ
Is a scanned PDF already searchable?
Usually, no. A scan often stores each page as an image, so a PDF viewer cannot identify the words until OCR adds a text layer.
Can I copy text after making a PDF searchable?
Yes, when OCR recognizes the characters, you should be able to select and copy them. Check copied text against the scan because recognition can make mistakes.
Will OCR make a scanned PDF fully editable?
Not necessarily. OCR makes text searchable and selectable; changing the original wording, layout, or table structure may require additional editing work.