Is my PDF scanned or text? A 60-second check before you convert to EPUB

Last updated: 5 November 2026

If you can click into a PDF and select a single word, or search for a word and get a hit, it has real text and you don't need OCR. If the page behaves like a picture, with no selectable words and no search results, it's a scan and needs OCR (optical character recognition) before it can become a proper EPUB. This is the quickest way to answer "is my PDF scanned or text" without installing anything.

How can I tell if my PDF is scanned or has real text?

Try to select and search the text. A PDF made by software, such as Word, InDesign or an export from a website, stores characters, fonts and positions. A scan is, in the words of Investintech's support guide, basically a flat image of a document.

Run these tests in order. Stop at the first one that gives a clear answer.

• Search test. Open the PDF in any viewer and press Ctrl+F (Cmd+F on Mac). Search for a common word like "the". Many hits means real text. "No results" on a page full of words means an image.
• Drag-select test. Click and drag across a paragraph. With real text, the highlight follows each line and skips the gaps between lines. With a scan, you usually get one solid rectangle over the area, which is what Investintech describes for scanned files.
• Zoom test. Zoom to 400% on a single letter. Real text stays crisp, with sharp edges at any size. A scan turns blurry or blocky, because it's made of pixels.
• Copy-paste test. Copy a paragraph and paste it into a plain text editor. Clean words mean real text. Nothing, or a pile of symbols, means trouble (see below).

Two of these tests agreeing is enough. If they disagree, you probably have a hybrid file, covered further down.

What does a scanned PDF look like in practice?

A scanned PDF looks like a photograph of a page. You'll often see slight tilt, shadowed edges near the spine, speckles, uneven margins, or a page that's the wrong shape because the scanner bed cut it off.

Common sources of scans:

• Library or school photocopies turned into PDFs.
• Old books digitised by a flatbed scanner or phone app.
• Documents that were printed, signed and scanned back in.
• Photos of pages taken with a phone camera.
• "Print to PDF" on some office scanners, which often produce image-only files.

ANU PDFLAB's comparison describes a scanned PDF as a container holding one full-page photo per sheet, and notes the practical symptom: Ctrl+F finds nothing in the scan while the text-based version highlights matches instantly.

One caution: a clean-looking page doesn't prove it has text. A well-lit, straight scan can look just like a digital document. Rely on the select and search tests, not your eyes.

Is my PDF scanned or text if search only works on some pages?

Then the file is mixed, or it's a scan that already had OCR applied. Test several pages, not just the first. Beginning, middle and end is a sensible sample.

Mixed files turn up more than people expect:

• Text body, image pages. A digital book with a scanned cover, or inserted scanned appendices or signed pages.
• Scan with a hidden text layer. Some scanners and apps run OCR and place invisible text behind the page image. Search works, but the text may be wrong.
• Text plus images of text. A designed document where a table, chart or heading is a picture. You can search the body text but not those parts.

How to test a hidden OCR layer

Search for a distinctive word you can see on the page. Then copy a full paragraph and paste it into a text editor. Look for these signs of poor OCR:

• "rn" read as "m", or "l", "1" and "I" swapped.
• Words broken by random spaces or run together.
• Missing accents or odd symbols in non-English text.
• Columns or sidebars mixed together in the wrong order.
• Header and footer text repeated inside paragraphs.

If a hidden layer is present but garbled, the file counts as a scan for practical purposes. The text inside it can't be trusted for an EPUB, so redoing OCR is worth considering.

How do I check the fonts or the file's properties?

Fonts are a technical but reliable tell. A PDF with real text lists the fonts it uses. A pure image PDF lists none.

• Adobe Acrobat or Reader: File > Properties > Fonts tab. A list of fonts means text is present. An empty list suggests an image.
• Command line: if you have poppler tools installed, run pdffonts yourfile.pdf. An empty table means no text fonts at all. Run pdftotext yourfile.pdf - to print any extractable text; if it prints nothing, the file is image-only.
• File size clue: a 200-page novel that's under a few megabytes is usually text. The same book at 150 MB is probably page photographs. It's a hint, not proof, since text PDFs with many illustrations can also be large.

Here's a summary of what each test tells you:

Do I need OCR before converting to EPUB?

Only if the PDF has no usable text. If you passed the search and copy tests, skip OCR. It adds time, and an OCR pass can introduce errors into text that was already perfect.

Our converter's own settings reflect this. The "Read scanned pages (OCR)" option is described as only for scans with no text at all, slow, and giving a text-only result. The same setting says it's skipped automatically when not needed. So leaving it off for a text PDF is correct, and you don't need to guess.

Use this as a decision guide:

• Search works, copied text is clean: don't use OCR. Use the Standard model, which the converter lists as free for text PDFs and best for novels and ordinary text PDFs.
• No selectable text at all: switch on OCR and pick the language the book is written in. Check that the language list includes yours: it currently offers English, Turkish, German, French, Spanish, Italian, Portuguese, Dutch and Greek.
• Garbled hidden text: try OCR on the file, or re-scan at a better quality if you still have the original.
• Mixed file: OCR is likely still needed for the image pages. Check the finished EPUB page by page for where the text changes quality.

For the full walkthrough on scans, see our guide on converting a scanned PDF to EPUB with OCR.

What should I expect from the EPUB after OCR?

Expect text-only output that reflows, but not a perfect copy of the original. OCR reads the shapes of letters and guesses the words, so accuracy depends on the scan, and your EPUB can only be as good as the recognised text.

What helps accuracy:

• Resolution: scans at around 300 dpi are the usual recommendation for OCR of normal-size print. Phone photos taken at an angle or in shadow do worse.
• Straight pages: a skewed or curved page near the spine confuses line detection.
• Contrast: clean black text on white paper beats faded or yellowed pages.
• Right language: choosing the wrong OCR language produces nonsense on accented characters.
• Layout: plain single-column prose is the easiest. Multi-column layouts, tables and equations are hardest and may not survive. For heavy technical material, see our note on textbook PDFs and equations.

After conversion, skim the first chapter and one page from the middle. Check names, numbers and chapter headings, since those are where OCR slips matter most.

If your file turns out to have real text, the free route is simpler and keeps your chapters; we explain it in how to convert a PDF to EPUB for free. Either way, you can upload the file to Convert2EPUB and see whether it needs OCR before you commit to anything; the account comes with 30 free credits.

Frequently asked questions

Can I tell if a PDF is scanned just by looking at it?

Not reliably. A good scan looks like any digital page at normal zoom. Zooming in helps, since scanned text turns pixelated, but selecting and searching the text is more dependable.

Is a searchable PDF the same as a text PDF?

Not always. A searchable PDF can be a scan with an OCR text layer added behind the image. It will pass the Ctrl+F test, but errors in that layer will carry into your EPUB. Copy a paragraph out and read it to check quality.

Does a PDF without OCR convert to EPUB at all?

A scan without OCR can only become images of pages, not reflowable text, so it won't give you the resizable, searchable text that makes an EPUB useful. That's why scans need OCR first. The reasons text matters on e-readers are explained in why a PDF is hard to read on a Kindle.

Will OCR improve a text PDF?

No. If the text is already real, OCR adds nothing and can introduce mistakes. Leave it off and convert the text directly.

What if my PDF is password-protected or has copy protection?

Restrictions on copying can stop the copy-paste test even when real text exists. In that case, rely on the Ctrl+F search and the fonts list instead. Whether a protected file converts depends on its settings, which isn't something these tests can tell you.