Highlight PDF
Mark key text in yellow or any color, underline or strike it through, or shade areas of scans, with no upload.
Processed on your device, not uploaded.
How to Highlight Text in PDF
- 1
Select Your PDF
Lecture notes, a draft, or any reading material.
- 2
Choose a Highlight Mode
Text for regular words, Manual Area for scans.
- 3
Mark the Key Parts
Drag from the first word to the last, or drag a box.
- 4
Apply and Download
Press Apply Highlights, then Download PDF.
Highlight PDF Features
See-Through Yellow
Highlights follow the text lines, so definitions and formulas stay readable.
Any Color per Topic
For example, green for definitions and pink for questions to ask later.
Highlight Scanned Pages
Manual Area mode adds permanent color to pages without selectable text.
Underline and Strike Through
Underline quotes or strike through sentences you plan to revise.
Common Questions
Keep Text mode, choose Highlight Text, and drag from the first word to the last. Press Apply Highlights when done.
Yes, tap the color swatch below the toolbar to replace the default yellow, so each topic gets its own color.
Yes for Text mode, since it's saved as a PDF comment. Manual Area highlights become permanent color on the page.
No, the words underneath stay visible. Use Redact PDF to remove sensitive data permanently.
Yes, it runs in your phone's browser, and the file is highlighted on your device without uploading to a server.
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