How to Batch OCR Thousands of Image-Based PDFs in Adobe Acrobat
Question details
The user needs to process approximately 11,000 image-only PDF files to make them searchable and editable, saving the processed outputs to a designated destination folder.
- Product
- Adobe Acrobat Pro
- Device & OS
- not provided
- Scenario
- Automating the optical character recognition (OCR) process across a massive archive of scanned or image-based PDF documents.
- Observed behavior
- Looking for a method to batch convert thousands of PDFs efficiently without having to open and run OCR on each file individually.
Before processing thousands of files, copy a small sample of 10 to 20 PDFs into a test folder to verify your OCR language settings, output quality, and destination routing.
Use Action Wizard in Adobe Acrobat Pro
Create an automated batch action using Acrobat Pro's built-in Action Wizard to apply the Recognize Text tool to entire folders simultaneously.
The Action Wizard in Adobe Acrobat Pro allows you to set up a predefined sequence of commands, such as applying OCR and saving to a specific folder, and run it against a large batch of files. Keep in mind that processing 11,000 files requires significant CPU power and time, so OCR accuracy will depend heavily on the source image quality, correct language selection, page orientation, and document structure.
Launch Adobe Acrobat Pro. Navigate to the 'Tools' tab and select 'Action Wizard' from the list of available tools.
Click 'New Action' in the Action Wizard toolbar to open the Create New Action dialog box.
In the left-hand pane under 'Recognize Text', select 'Recognize Text' and click the '+' icon in the center to add it to the action steps on the right.
Under 'Files to be Processed' on the right side, click 'Add Folder' and browse to select the directory containing your 11,000 image-based PDFs.
Under the 'Save to' section on the right, click 'Add Folder' (or choose 'Save to Local Folder') to designate the output folder where the new searchable PDFs will be saved.
Click 'Save', name your action (e.g., 'Batch OCR to Output Folder'), and confirm. Finally, select the action from the Action List and click 'Start' to begin processing the batch.
Extract Text from Scanned PDFs with WPS Office
WPS Office offers an integrated, highly accurate OCR engine within its PDF toolkit. It allows you to quickly convert image-based PDFs into editable text formats, search through scanned documents, and streamline your digital paperwork with ease.
- 1. Open the PDF in WPS Office: Launch WPS Office, go to the 'PDF' tab, and open your scanned or image-based PDF document.
- 2. Access the OCR Tool: Navigate to the 'Tools' menu on the top ribbon and select 'OCR' or 'PDF to Word' depending on your output goal.
- 3. Select OCR Settings: Choose the correct document language to ensure high recognition accuracy, then designate whether you want to extract the text or maintain the document layout.
- 4. Convert the Document: Click 'Convert' or 'Extract'. WPS Office will process the image and provide you with fully editable and searchable text.
Frequently Asked Questions
Why is the text extracted by OCR full of errors and random symbols?
OCR accuracy drops significantly if the source PDF has low resolution (below 300 DPI), poor lighting, skewed pages, or if the wrong recognition language is selected in the settings. Always ensure your scan quality is high and verify the language settings before running the OCR process.
Can I batch OCR PDFs automatically overnight?
Yes, utilizing tools like Adobe Acrobat's Action Wizard allows you to initiate the process and leave it running. Because OCR is heavily CPU-dependent, running a massive batch overnight is actually recommended so it does not interfere with your daily computing tasks.
Will running OCR change the original layout of my PDF?
If you choose the 'Searchable Image' OCR option, the original appearance of the document remains exactly the same, but an invisible layer of text is placed over the image for searching and copying. If you choose 'Editable Text and Images', the software will attempt to replace the image with actual system fonts, which may slightly alter the layout.
