Does this tool actually add real highlights to the PDF or just overlay colors?

This tool adds proper PDF highlight annotations using the PDF-lib library. These are real highlight annotations that can be viewed, edited, and removed in standard PDF readers like Adobe Acrobat, Preview (Mac), and most modern PDF viewers.

Can I remove or edit the highlights after they're added?

Yes, the highlights are added as proper PDF annotations that can be edited or removed using standard PDF editing software. Most PDF readers allow you to select and delete highlight annotations.

What's the difference between this and just coloring over text with a pen?

PDF highlights are digital annotations that preserve the original text and make it selectable. Unlike physical highlighting, digital highlights don't damage the document, can be easily removed, and work perfectly with screen readers and accessibility tools.

Does the tool work with scanned PDFs or only text-based PDFs?

This tool works best with text-based PDFs that have selectable text. For scanned PDFs (images of text), you would need OCR (Optical Character Recognition) first to make the text selectable before highlighting.

Is my PDF data safe when using this tool?

Absolutely! All processing happens locally in your web browser. Your PDF files never leave your device or get uploaded to any server, ensuring complete privacy and security of your documents.

Can I highlight multiple pages at once?

Yes, the tool automatically searches for your specified text across all pages in the PDF and adds highlights wherever the text is found. This means you can highlight content that appears on multiple pages with a single search.

PDF Text Highlighter

Add text highlights to PDF documents with multiple colors and adjustable opacity for better readability and note-taking. Perfect for study materials, document review, and important information identification.

highlight

text

annotate

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