Highlight PDF
Highlight text and add sticky-note comments directly on a page.
Select a PDF to mark up
Click to choose, or drop a file here
How to Highlight PDF
- 1
Open the tool
Open the Highlight PDF tool and drop your file onto the page, or click to browse for it. Everything runs in your browser — the file is never uploaded.
- 2
Highlight and comment
Drag over text to highlight it, or drop a sticky-note comment anywhere on the page.
- 3
Apply and download
Click Apply and download the annotated PDF.
Related PDF tools
Highlight PDF — frequently asked questions
Is this the same as Redact PDF?+
No — Redact permanently destroys what's underneath by flattening the page to an image. Highlighting draws a translucent color over the text, which stays fully intact, selectable, and searchable underneath.
Are the highlights and comments real, editable PDF annotations?+
No — they're drawn directly onto the page as part of its permanent content, the same way the other stamping tools here work. They won't show up in another app's "comments" panel, and can't be toggled off later.
Can I mix multiple colors on one page?+
Yes — pick a color before drawing each highlight or dropping each comment; every mark keeps the color it was given.
Do you upload my files to a server?+
No — every tool here processes your files entirely on your device, and nothing is uploaded to a server. The AI tools that used to send extracted text to a server are currently disabled.
Is there a file size limit?+
There's no artificial limit we impose, but since processing happens in your browser, very large files (500+ MB or 1,000+ pages) are limited by your device's memory rather than by us.
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