Highlight & Annotate PDF Online Free

Add yellow highlight rectangles to PDF pages locally. Free, private, works in your browser.

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How to use the PDF Highlighter

  1. Upload your PDF

    Choose the document you want to highlight.

  2. Set the highlight area

    Enter the page number and the rectangle position and size in PDF points.

  3. Download

    Save the PDF with a semi-transparent yellow highlight drawn on the page.

PDF Highlighter FAQ

What kind of annotations can I add?

This tool draws semi-transparent yellow highlight blocks. For text notes use the PDF Editor; for images or logos use Insert Image into PDF.

Will the highlight cover the text underneath?

No. The highlight is transparent, so the text stays readable.

Is my PDF uploaded?

No. The file is processed by JavaScript inside your browser tab and never sent to our servers. Closing the tab clears it from memory.

Can I highlight several areas?

Add one highlight, download, then load that file again to add the next one.

Is it free?

Yes — no account required.

Quick answers

Do EasyPDFHub tools upload my files to a server?

No. EasyPDFHub runs conversions and edits inside your web browser using JavaScript libraries such as pdf-lib and the Canvas API. When you pick a file, it stays on your device in memory until you download the result. We do not operate a file-upload API for PDF or image processing, so there is no account, queue, or cloud storage step. That makes the tools suitable for contracts, payslips, ID scans, and other sensitive documents you would not email to a random website. You need a modern browser (Chrome, Edge, Firefox, or Safari) and a stable device — very large files may be slower because processing uses your CPU, not remote servers. Always keep a backup of originals before editing.