How to Highlight Precise Areas in Adobe Acrobat Pro DC
Question details
Users need a way to highlight arbitrary or precise visual areas in a PDF document where the standard text highlight tool fails or does not apply.
- Product
- Adobe Acrobat Pro DC
- Device & OS
- not provided
- Scenario
- Attempting to highlight a specific visual region, complex layout, or scanned image within a PDF document.
- Observed behavior
- The standard Highlight tool only works on selectable text. Workarounds like drawing tools do not natively function as true transparent text highlighters, making precise non-text highlights difficult.
Check if your PDF contains selectable text or if it is a flat scanned image, as this determines whether you can use standard highlighting or need to employ a visual shape workaround.
Use the Rectangle Tool as a Custom Area Highlighter
Create a visual highlight over any specific area by using a rectangle shape with reduced opacity.
Because Adobe Acrobat lacks a dedicated freehand or area highlighter for non-text regions, using a drawing annotation with adjusted opacity is the most reliable workaround.
Open your PDF in Adobe Acrobat Pro DC. Go to 'Tools' > 'Comment', and select the 'Rectangle' drawing tool from the top toolbar.
Click and drag to draw a rectangle over the precise area you want to highlight.
Right-click the drawn rectangle and select 'Properties'.
In the Properties dialog, go to the 'Appearance' tab. Change the 'Fill Color' to yellow (or your preferred highlight color), set 'Border Color' to 'No Color', and reduce the 'Opacity' slider to around 30-40% so the underlying document content remains visible.
Apply OCR to Highlight Text in Scanned PDFs
If you are trying to highlight text in a scanned image, converting it to selectable text allows the standard highlight tool to work perfectly.
Highlight Any Precise Area Instantly with WPS PDF
Skip the complex workarounds. WPS Office includes a dedicated 'Area Highlight' tool in its PDF editor, allowing you to easily highlight any specific region, scanned image, or chart without needing selectable text.
- 1. Open your PDF in WPS Office: Launch WPS Office and open your target PDF file.
- 2. Navigate to the Comment tab: Click on the 'Comment' tab located in the top ribbon menu to access annotation tools.
- 3. Select Area Highlight: Click the 'Area Highlight' button on the toolbar.
- 4. Highlight your precise area: Click and drag over any part of your document to instantly highlight the selected area, regardless of whether it contains text or images.
Frequently Asked Questions
Why doesn't the Acrobat highlight tool work on my PDF?
The standard Highlight tool in Adobe Acrobat requires underlying selectable text. If your PDF is a flat image, a scan, or has complex graphics, the tool cannot snap to the text, requiring a workaround like the Rectangle tool.
Can I use the Pencil tool to highlight areas in Acrobat?
You can use the Pencil tool to draw freehand lines, but it does not natively behave like a transparent highlighter. You would need to manually adjust the line thickness and reduce the opacity in the Pencil tool properties, which can be tedious for marking precise areas.
Will these custom rectangle highlights appear when I print the PDF?
Yes, as long as the annotation is set to print. In the Adobe Acrobat print dialog, ensure that 'Comments and Forms' is set to 'Document and Markups' so your custom highlight rectangles are included on the printed page.
