PDF Highlighter Online
Upload a PDF, mark important passages, add annotation text, draw callout boxes, and download the highlighted PDF without installing desktop software.
or click to browse • PDF files up to 50 MB
Annotation tools built for review work
Use focused browser tools for the common PDF markup tasks people expect from a highlighter.
Transparent highlights
Draw readable yellow highlights over paragraphs, clauses, table cells, or scanned areas.
Text notes
Place short comments, labels, or review notes directly on the PDF page.
Callout rectangles
Outline figures, signatures, form fields, and problem areas with precise boxes.
Saved versions
Save edits as versions while you review, then download the final highlighted PDF.
How to highlight a PDF online
The highlighter opens directly in annotation mode so you can mark up the document, save versions, and export the finished file.
Upload your PDF
Choose the document you want to mark up. Standard PDF files are supported up to your account limit.
Highlight and annotate
Drag across the PDF to highlight important areas, then add text notes or rectangles where needed.
Save or download
Save a version for later editing or download a PDF with the highlights embedded in the file.
PDF Highlighter FAQ
Can I highlight text in any PDF?
Yes. The tool lets you draw visual highlight areas on standard PDF pages, including text documents, reports, forms, and many scanned PDFs.
Are the highlights saved into the PDF?
Yes. When you download or save, the highlights and annotations are embedded into a new PDF file.
Can I add notes as well as highlights?
Yes. Use the text tool for short notes and the rectangle tool for callouts alongside regular highlights.
Do I need Adobe Acrobat or a desktop app?
No. PDFCheck runs in your browser, so you can highlight PDFs online without installing PDF editing software.