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OCR a Scanned PDF

Publish date
Sep 1, 2026
AI summary
OCR a scanned PDF by uploading it to the browser tool, which adds a searchable text layer while preserving the original layout; check that the file lacks searchable text, verify page count and size against plan limits, upload, preview, download, and confirm search and selection work, then keep the searchable copy, splitting or upgrading the plan if caps are exceeded.
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People type ocr scanned pdf when the file looks like text but Cmd-F / Ctrl+F finds nothing. The pages came from a scanner or a phone camera. The PDF is mostly images. There is no usable text layer yet.
This page is the job for that file: run OCR, keep the layout, then prove search and selection work. The broader map of scanned vs digital PDFs is OCR PDF: Make a Scanned File Searchable. The same click path without the scanned-file focus is How to OCR a PDF. For plan caps on a free path, see Free OCR PDF. For picking software, use PDF OCR Software: What to Look For.

What a scanned PDF is

A scanned PDF stores each page as an image (or a stack of images). You can see letters. The computer cannot search them until OCR writes a text layer into the file.
A digital PDF already has selectable text. If you can highlight a word and search it, stop. You do not need OCR for search.
Practical rule: if select works and search works, you already have a digital PDF.

What OCR does to that scan

OCR reads the picture of each page and writes text the computer can find. After a clean pass on a scanned PDF:
  • Search works. Cmd-F / Ctrl+F finds a word you can see.
  • Selection works. You can highlight a sentence and copy it.
  • The page still looks like the scan. The tool does not redesign the document.
You are turning an image-only PDF into a searchable PDF. You are not converting to Word, extracting tables, or chatting with the file yet. Those jobs need readable text first.
Important distinction: search proving that some text exists is not the same as every character being correct. Blurry scans and faint stamps still fail.

Before you upload

  1. Confirm the file will not search (try select, then Cmd-F / Ctrl+F on a clear word).
  1. Count pages and check file size against PDF.ai pricing.
  1. Prefer a browser path when you do not want a desktop install.
Current OCR caps on that pricing table:
  • Hobby is Free forever (price 0), OCR 2 pages/file, max file size 10MB
  • Pro: OCR 10 pages/file, max file size 50MB
  • Ultimate: OCR 50 pages/file, max file size 50MB
  • Enterprise: OCR 100 pages/file, max file size 100MB
If the scan is longer than the cap, split the file first, or use a plan that covers the page count. Do not assume a long archive will go through on Hobby.

How to OCR a scanned PDF in the browser

1. Open the OCR tool

Go to https://pdf.ai/tools/ocr-pdf. The page is free online OCR for scanned PDFs: make text searchable and selectable, no signup required. The upload box is labeled Click to upload or drag and drop.
notion image
The tool runs in the browser. There is no signup and no software install for that path. It accepts PDF, PNG, JPG, and WebP. A multipage scan usually arrives as PDF. A single phone photo of a page can go up as an image.

2. Upload the scanned file

Drop the scanned PDF (or the page image). Wait until processing finishes. Preview the result before you download.
If upload fails, check page count and size against the plan caps above before you assume OCR “does not work.”

3. Download, then prove it

Download the new file. Keep the original scan until you have checked the output.
notion image
Open the file and:
  • Search a word from the first page
  • Search a word from a later page you care about
  • Select one sentence and paste it somewhere else
If those three work, you have a searchable PDF. Archive that copy. If they fail, the scan may be too blurry, too faint, or outside the page/size cap. The longer failure list sits on the OCR PDF pillar.

A short action plan

  1. Confirm the PDF will not search (select plus Cmd-F / Ctrl+F).
  1. Count pages and check size on pricing.
  1. Open https://pdf.ai/tools/ocr-pdf.
  1. Upload the scanned PDF (or PNG / JPG / WebP of a page).
  1. Preview, download, then search the first page and a later page.
  1. Keep the searchable copy. Split or change plan only if you hit the cap.
For the same tool without the scanned-file framing, use How to OCR a PDF. For Hobby limits, use Free OCR PDF. For the buyer checklist, keep PDF OCR Software: What to Look For next to this. The hub for scanned vs digital files remains OCR PDF: Make a Scanned File Searchable.
If you want the file in the rest of your PDF workflow after the text layer is in place, start at PDF.ai. OCR the scan first.