Highlight Text Online — Free & Instant

Highlight text in PDF files online for free. Mark up, underline and annotate any PDF. No signup needed.

🖊️Highlight PDF — Free, No Signup

How to highlight text in 4 steps

Upload your PDF file
Select the highlight tool and choose a colour
Click and drag over the text you want to highlight
Download the PDF with highlights saved

Why highlight text your PDF?

Highlight key passages in research papers, legal documents, or study materials for review, annotation, or sharing. Highlights are preserved when the PDF is opened in any reader.

Tips for best results

Use different highlight colours to categorise information (e.g. yellow = important, green = action items)
Combine highlights with sticky note comments for detailed annotations
Highlighted PDFs work in all PDF readers including Adobe, Preview, and browser viewers

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Frequently asked questions

Is Highlight Text free to use?+

Yes. Highlight Text is free for files up to 25MB with up to 3 tasks per day. Upgrade to Pro for unlimited use.

Do I need to create an account?+

No account is needed for free tasks. Sign up to unlock more daily tasks and larger file sizes.

Is my file secure?+

All files are encrypted during transfer and automatically deleted 1 hour after processing. PDFKit never accesses your document content.

Does this work on mobile?+

Yes. PDFKit is fully optimised for iOS and Android browsers. No app download required.

🔒 HTTPS encrypted🕐 Files deleted in 60 minutes🚫 Never read by humans✅ Free, no signup required