How to Fix the Acrobat Highlight Tool Creating an Oversized Oval
Question details
The user needs to resolve a software issue where the PDF highlight tool creates an abnormally large, oval-shaped highlight covering multiple lines instead of snapping correctly to the text.
- Product
- Adobe Acrobat
- Device & OS
- not provided
- Scenario
- Attempting to highlight text in a PDF document downloaded from a browser, email, or a scanned file.
- Observed behavior
- The highlight tool cursor changes to an oversized oval shape that covers approximately 10 lines, failing to recognize specific text boundaries.
Check whether your PDF is a scanned image or if it contains selectable text, as this will determine whether you need to run Optical Character Recognition (OCR) or use a system print workaround.
Use the Scan & OCR Tool to Recognize Text
Best for scanned PDFs where the software cannot detect real text boundaries, causing the highlight tool to behave erratically.
If your PDF is essentially a flat image from a scanner, the highlight tool cannot snap to individual words. Acrobat's OCR feature creates a hidden text layer that allows normal text selection and precise highlighting.
Open your document in Adobe Acrobat. Navigate to the top menu and select 'Tools', then choose 'Scan & OCR'.
Click on 'Recognize Text' from the toolbar and select 'In This File' from the dropdown menu.
Wait for the OCR process to complete. Select the 'Comment' tool and try highlighting your text again to see if it snaps correctly to the words.
Apply the 'Save as PDF' Print Workaround
Resolves highlighting bugs in PDFs generated by problematic web browsers or email clients.
Easily Highlight and Edit PDFs with WPS Office
If your current PDF reader continues to struggle with erratic highlighting and text recognition bugs, switch to WPS PDF. WPS Office offers a powerful, seamless PDF editor that accurately recognizes text boundaries, allowing you to highlight, annotate, and modify documents without frustrating graphical glitches.
- 1. Open the PDF File: Launch WPS Office, click on 'Open', and select the PDF document you want to read or edit.
- 2. Select the Highlight Tool: Navigate to the 'Comment' tab on the top ribbon and click the 'Highlight' icon.
- 3. Apply Your Highlights: Simply click and drag your cursor over the desired sentences. WPS PDF will automatically snap to the text cleanly.
Frequently Asked Questions
Why does my PDF highlight appear as a giant box or oval?
This happens when the PDF software fails to detect the underlying text boundaries. It is usually caused by the document being a scanned image without a text layer, or the file containing corrupted structural code generated by certain web browsers.
Will OCR fix all highlighting issues?
OCR (Optical Character Recognition) will fix highlighting issues for scanned documents by converting images of text into actual selectable text. However, if the PDF already contains selectable text but is structurally bugged, using the 'Print to PDF' workaround is a better solution.
How do I know if my PDF needs OCR before highlighting?
Try to select a single word with your mouse cursor. If you cannot select individual letters and clicking the page selects the entire document like a picture, it is a scanned image and requires OCR.
Does the 'Save as PDF' workaround reduce document quality?
Using 'Save as PDF' or 'Print to PDF' generally maintains text and visual quality, but it flattens the document. This means any existing interactive forms, bookmarks, or previous annotations may become permanently merged with the page.
