Guides
How to make a scanned PDF searchable on iPhone
Turn a scanned image-only PDF into searchable, selectable text on iPhone using on-device OCR — so you can find documents by what they say, copy text, and stop paying a weekly scanner subscription.
Last updated June 20, 2026
Direct answer
A scanned PDF is just an image, so its text is not searchable until you run OCR. Scan or import the document, tap OCR to add an invisible text layer on-device, then export — now Files and Spotlight can find it by content, and you can select and copy the text.
Why a scan isn’t searchable by default
When you scan a page, your iPhone saves a photo of it. To you it reads as text, but to the phone it is a grid of pixels with no words attached. That is why a freshly scanned contract, receipt, or form won’t turn up when you search for a phrase inside it — there is nothing to match.
OCR (optical character recognition) fixes this. It reads the shapes in the image, recognizes them as characters, and writes an invisible text layer behind the picture. The page looks identical, but now it is selectable and searchable. On a modern iPhone this runs on-device with the iOS Vision framework, so it is fast and private — the document never has to leave your phone.
Steps
- Scan the pages (or import an existing image-only PDF).
- Tap OCR to recognize the text on-device.
- Select a line to confirm recognition worked.
- Re-scan any blurry page that didn’t pick up.
- Export the PDF with its new searchable text layer.
Get cleaner OCR results
| Problem | Fix |
|---|---|
| Missed words | Brighten the page and rescan; OCR needs sharp edges |
| Crooked lines | Reconfirm the auto-crop corners before running OCR |
| Faint receipt text | Hold steady, get closer, avoid glare from overhead light |
| Handwriting not recognized | OCR targets printed text; handwriting is hit-or-miss |
Make every scan searchable.
Document Scanner runs OCR on-device, then exports a searchable PDF — no weekly subscription, no upload.
FAQ
Why can't I search the text inside my scanned PDF? +
A scan is a photo of a page, so the text is just pixels. OCR reads those pixels and adds an invisible text layer that makes the PDF searchable and selectable.
Does OCR work offline on iPhone? +
Yes. iPhone OCR runs on-device with the iOS Vision framework, so it works in Airplane Mode and the document never leaves your phone.
Can I make an existing PDF searchable, not just a new scan? +
Yes. Import an image-only PDF, run OCR, and export a new copy with the searchable text layer added.
Is OCR free on iPhone? +
Live Text gives free OCR for copying from a single scan. A permanent searchable layer across multi-page PDFs is Document Scanner's Pro tier — $4.99/month (3-day trial), $14.99/year, or $19.99 lifetime. No weekly trap.
Related pages
- Document Scanner for iPhone and iPad
- How to scan documents on iPhone
- Scan-to-PDF size estimator (free tool)
- How to sign a PDF on iPhone
- How to edit a PDF on iPhone
Steps
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Step 1
Scan or import the document
In Document Scanner, scan the pages (auto-crop handles the edges) or import an existing image-only PDF you want to make searchable.
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Step 2
Run OCR over the pages
Tap OCR. The app reads the text on each page on-device using iOS Vision and builds an invisible, selectable text layer behind the image.
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Step 3
Check the recognized text
Tap and drag to select a line of text to confirm OCR caught it. Clean, well-lit, straight scans recognize best; re-scan a blurry page if a section did not pick up.
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Step 4
Export the searchable PDF
Export → PDF. The new file carries the text layer, so Files and Spotlight can find it by content and you can copy text out of it.
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Step 5
Find it later by what it says
Search a word or phrase from inside the document in Files or Spotlight — a searchable PDF surfaces on the text, not just its filename.
Frequently asked questions
Why can't I search the text inside my scanned PDF?
A scan is a photo of a page, so the text is just pixels — your iPhone sees a picture, not words. OCR (optical character recognition) reads those pixels and adds an invisible text layer behind the image, which is what makes the PDF searchable and selectable. Without OCR, Spotlight and Files have nothing to match against.
Does OCR work offline on iPhone?
Yes. Modern iPhone OCR runs on-device using the iOS Vision framework, so it works in Airplane Mode and your document never leaves the phone. Swarmval Document Scanner runs OCR locally for this reason — verify by turning on Airplane Mode and scanning.
Can I make an existing PDF searchable, not just a new scan?
Yes. Import an image-only PDF you already have, run OCR over it, and export a new copy with the searchable text layer added. The visible page looks identical — the difference is that you can now select, copy, and search the text.
Is OCR free on iPhone?
Apple's Live Text gives you free OCR for copying text out of a single photo or scan. For adding a permanent searchable text layer across multi-page PDFs and batch documents, that is Document Scanner's Pro tier — $4.99/month with a 3-day trial, $14.99/year, or $19.99 lifetime. No weekly subscription.
Will OCR change how my scan looks?
No. OCR adds an invisible text layer underneath the original image. The page looks exactly the same; it just becomes selectable and searchable. Nothing about the visible scan is altered.