What is a searchable PDF?
A searchable PDF contains text your reader can find and copy. A scan can look like text while containing only a picture.
Free toolSearchable PDFRead a scanned PDF, check uncertain words against each page, then save a searchable copy without uploading it.Open the OCR toolCheck your PDF quickly
- Open the PDF in your usual reader. Try to select one word, rather than the entire page.
- Copy that word and paste it into a text field. Does the pasted text match the page?
- Search for a distinctive word you can see. Try another page if the first one fails.
If you can copy the right letters and find them, that page has usable searchable text. If you can select only a rectangle, it is probably a picture of text. A word that copies incorrectly points to a faulty text layer.
A PDF can mix both kinds of page. One successful search does not prove every scan in the file has been read.
What changes when you add OCR?
OCR reads letters from an image and places recognised words in the PDF. The page can keep its scanned appearance while gaining text you can search and copy. Adobe's OCR instructions describe this distinction and recommend checking the result.
| PDF page | What you see | What search can read |
|---|---|---|
| Image-only scan | A picture of printed words | No reliable words until OCR adds them |
| Scan with OCR text | The same picture | A separate recognised text layer |
| Digital document | Text drawn by the PDF | Its existing text, without OCR |
Searchable does not mean editable. OCR can help you find a name in a scan, but it does not turn the visible page into a Word document.
Why is my PDF not searchable?
Start with the copy test above. It tells you whether the problem is missing text or incorrect text.
| What happens | Likely cause | Next step |
|---|---|---|
| You cannot select a word | The page is an image-only scan | Run OCR, then test a phrase in the downloaded PDF. |
| You can select words, but search misses one | The recognised spelling may be wrong | Copy the word. Compare it with the picture and correct it if your OCR tool allows. |
| Copied words are scrambled | The text layer or reading order is faulty | Try a different OCR pass or a tool that can replace an existing OCR layer. |
| Some pages work and others do not | The PDF mixes digital and scanned pages | Check each problem page. Keep working text where it is already correct. |
Do not assume rerunning OCR will fix old text. Our Searchable PDF tool leaves pages with selectable text alone by default. Its optional second pass can add duplicate words. For a document with a bad existing layer, a tool with a replace or redo mode may fit better. OCRmyPDF documents skip, redo and force modes and explains their different effects.
What we found in one scanned PDF
On 22 September 2026, we tested floi's one-page sample scan. It is a synthetic document made from our public PDF-to-Images sample. We used pdftotext -raw to check the source and the exported copy.
| Check | Before OCR | After OCR |
|---|---|---|
| Extracted text | 0 characters | 82 words, including “Pick the pixels you need.” |
| File size | 130,621 bytes | 132,819 bytes |
| Page rendered at 100 ppi | The source and result produced byte-identical PNGs in this test. | |
The export kept the source bytes as an exact prefix and appended 2,198 bytes. We compared 100 ppi renders made with pdftoppm byte for byte. This shows what the tool did to this sample. It does not prove that every PDF reader will display every input identically.
Choose the fix that matches the file
For an image-only scanned PDF, add OCR and inspect a few important phrases. The floi tool reads the PDF in your browser, lets you correct recognised words, and downloads a copy with a searchable layer. It accepts one unlocked PDF up to 40 MB and 100 pages.
For a photo or screenshot rather than a PDF, use Image to Text. For a scan with existing but wrong OCR, use a tool that can replace that text layer. For a file that must be fully accessible, searchable words alone are insufficient. Adobe's accessibility guidance covers tags, reading order and alternatives for images.
OCR can misread handwriting, small type and unusual layouts. If a name, amount or date matters, compare the searchable words with the visible page before relying on them. Our OCR accuracy guide shows measured failures on fifteen images.