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How to Fix Unable to Highlight or Copy Text in PDF Documents
Question details
The user is unable to select, highlight, or copy text from a PDF file opened via Document Cloud or a mobile PDF reader.
- Product
- Adobe Acrobat / Document Cloud
- Device & OS
- Android
- Scenario
- Attempting to highlight, annotate, or copy text while reading a PDF document on a mobile app or desktop browser.
- Observed behavior
- The text selection tool fails to recognize the text, and the 'Highlight' or 'Copy' options do not appear in the pop-up menu when pressing and holding on the document.
Verify if the PDF is a scanned image rather than a standard text-based document, as scanned pages do not contain a recognizable text layer by default.
Verify Document Type and Select Text Manually
Determine if the PDF contains selectable text or is merely a scanned image by performing a manual selection test.
Many PDF documents are actually flat images created by scanners. Standard PDF readers cannot interact with the text inside these images until Optical Character Recognition (OCR) is applied.
Launch your PDF viewer or the Android Acrobat app and open the document you wish to read.
Press and hold directly on a word in the document to see if the standard text selection cursors appear.
Look for the pop-up menu. If the text is recognized, the 'Highlight' and 'Copy' options will be displayed. If the screen only shows general annotation options (like drawing or sticky notes), your document is a scanned image.
Use a Desktop PDF Application for Advanced Troubleshooting
If mobile text selection fails, opening the file on a desktop computer provides more advanced tools to check document properties and text layers.
Use WPS Office to Make Any PDF Selectable and Editable
With WPS Office, you can effortlessly convert scanned, image-based PDFs into fully searchable and selectable text using the built-in OCR feature, allowing you to highlight, copy, or edit the content seamlessly.
- 1. Open the PDF in WPS: Launch WPS Office on your desktop or mobile device and open your scanned or unselectable PDF file.
- 2. Apply OCR to the Document: Navigate to the 'Tools' tab and select 'OCR'. Choose to extract text or convert the document to a fully editable format.
- 3. Select, Highlight, and Copy: Once the OCR processing is complete, you can freely click, drag, highlight, or copy any text in the document using standard selection tools.
Frequently Asked Questions
Why does my PDF act like a picture instead of text?
This happens when the PDF was created by scanning a physical paper document. The scanner saves the page as a flat image, meaning there is no underlying text layer for the PDF reader to interact with.
How can I copy text from a scanned PDF?
To copy text from a scanned PDF, you must use a PDF editor equipped with Optical Character Recognition (OCR) technology. OCR analyzes the image and converts the visual letters into actual selectable text data.
Why is the highlight tool disabled in my PDF reader?
The highlight tool requires selectable text to function. If the document is restricted by permissions (security settings preventing copying or editing) or is an image-based scan, the highlight option will be grayed out or entirely unavailable.
Can I edit PDF text directly on my Android phone?
Yes, but you need a dedicated mobile PDF editor app like WPS Office that supports mobile text editing and annotations. If the PDF is a scan, you may still need to perform OCR first before editing the text.
