How to Run OCR on a Multipage Scanned PDF Document
Question details
The user needs to know if they can apply OCR (Optical Character Recognition) to an entire 50- to 100-page scanned PDF document simultaneously, rather than processing each page individually.
- Product
- Adobe Acrobat Pro
- Device & OS
- not provided
- Scenario
- Converting a large, multi-page scanned PDF document where each page is an image into a fully searchable and editable text document.
- Observed behavior
- The user possesses a multipage image-based PDF and wants to process the entire file in one operation to extract or recognize the text across all pages.
Ensure your scanned PDF document is clearly legible and properly aligned, as high-quality, high-resolution scans yield the most accurate text recognition results.
Run OCR on the Entire Document in Adobe Acrobat
Use the built-in Scan & OCR feature in Adobe Acrobat Pro to process all pages of a scanned multipage PDF in a single operation.
Adobe Acrobat Pro natively supports batch OCR processing within a single document. You do not need to process each page manually; the software can recognize text across a document of 50, 100, or more pages automatically.
Launch Adobe Acrobat Pro and open your 50- to 100-page scanned PDF document.
Navigate to the right-hand tools pane or click on the 'Tools' menu at the top left, then select 'Scan & OCR'.
In the secondary toolbar that appears, click on 'Recognize Text' and choose 'In This File' from the dropdown menu.
Ensure the settings are configured to process all pages. Click the 'Recognize Text' button to start. Acrobat will scan through the entire document and convert the images to searchable text.
Batch OCR Multipage PDFs with WPS Office
WPS Office features a powerful built-in PDF toolkit with an advanced OCR engine. You can effortlessly run OCR on large, multi-page scanned PDFs to extract, search, and edit text with outstanding accuracy.
- 1. Open the PDF in WPS Office: Launch WPS Office and open your multi-page scanned PDF document.
- 2. Click on the OCR Tool: Navigate to the 'Tools' tab on the top ribbon and click the 'OCR' button.
- 3. Configure Page Range: In the OCR dialog box, choose your desired output (such as Extract Text or Convert to Word) and make sure the page range is set to 'All Pages'.
- 4. Start Recognition: Click 'Confirm' or 'Start' to begin processing the entire document. Once finished, you will have fully editable and searchable text.
Frequently Asked Questions
Will running OCR alter the visual layout of my scanned PDF?
It depends on the OCR output style you choose. Selecting a 'Searchable Image' format keeps the original scanned image exactly the same visually, while overlaying an invisible layer of searchable text. Selecting 'Editable Text' may alter the layout slightly as it removes the image and replaces it with standard text fonts.
Why is the recognized text from the OCR process full of errors?
OCR accuracy heavily relies on the quality of the original scan. Low resolution, blurry text, handwriting, or skewed pages can cause recognition errors. Enhancing the contrast and deskewing the pages before running OCR can significantly improve the results.
Can I run OCR on multiple different PDF files at once?
Yes, advanced PDF editors like Adobe Acrobat Pro and WPS PDF offer batch processing capabilities. You can select multiple files or an entire folder and apply OCR to all of the documents sequentially without opening them one by one.
