How to Search for Words in Images Inside a PDF
Question details
The user needs to find specific words that are embedded within images pasted into a PDF document, which standard search functions cannot detect.
- Product
- PDF Editors
- Device & OS
- not provided
- Scenario
- Searching for text in a scanned document or a PDF containing image-based text.
- Observed behavior
- Pressing Ctrl+F does not find words located inside images, as they are not recognized as readable text by default.
Ensure the images inside your PDF are of decent resolution, as blurry or low-quality images can significantly reduce text recognition accuracy.
Use Adobe Acrobat Pro OCR to Make Text Searchable
Utilize Acrobat's built-in Optical Character Recognition (OCR) to convert image-based text into searchable text.
Optical Character Recognition (OCR) scans the pixels in an image and translates them into searchable text characters. Acrobat Pro includes this feature under its scanning tools to convert flat images into readable documents.
Launch Adobe Acrobat Pro and open the PDF containing the unsearchable images.
Navigate to the right-hand pane or the Tools menu, and select 'Scan & OCR' (or 'Enhance Scans' in older versions).
Click on 'Recognize Text' in the top toolbar and choose 'In This File'. Select your document's primary language.
Once the OCR process is complete, press Ctrl+F (or Cmd+F on Mac) and type your target word to search the newly recognized text layer.
Search Text in PDF Images Easily with WPS Office
WPS PDF includes a powerful built-in OCR engine that can instantly recognize text in scanned documents and images, making them fully searchable and editable without needing expensive software.
- 1. Open PDF in WPS: Launch WPS Office and open your image-based PDF document using the WPS PDF viewer.
- 2. Activate OCR: Navigate to the 'Tools' tab on the top ribbon and click on the 'OCR' button.
- 3. Select Recognition Mode: Choose the option to convert the document into a searchable PDF or extract the text directly to a Word document.
- 4. Search the Text: After the quick processing finishes, press Ctrl+F to effortlessly locate your desired words inside the newly recognized images.
Frequently Asked Questions
Why doesn't Ctrl+F work on my PDF?
If your PDF was created by scanning a physical document or consists of pasted images, it lacks a standard text layer. Standard search functions only read text layers, not image pixels.
Can I search for text in an image without Adobe Acrobat?
Yes, you can use alternative PDF software like WPS Office, which includes excellent OCR capabilities, or use various online OCR tools to convert your image-heavy PDF into a searchable format.
How can I improve OCR accuracy for my PDF images?
To improve OCR results, ensure the original images are clear, well-lit, and have a high resolution (at least 300 DPI). Avoid skewed, distorted, or heavily compressed images.
Does OCR work on handwritten text inside an image?
Most standard OCR tools are designed for printed text. While some advanced AI tools can read handwriting, typical PDF OCR features may struggle to accurately recognize cursive or messy handwriting.
