Annotate PDF Online Free

Drag and drop your PDF here, or choose a file. Your file stays on your device whenever this tool can run locally in your browser.

By using pdfcat, you agree to process your file locally and securely in your browser.

No files yet.

Private by design

This tool processes files locally in your browser whenever supported.

Add review notes, highlights, labels, and boxes to a PDF with a live browser preview.

pdfcat does not add a watermark to your completed file.

Common questions

How do I annotate PDFs?

Upload the required file, choose the options for Annotate PDF, preview the result, and download the finished file.

Is Annotate PDF free?

Yes. pdfcat requires no account and does not add a watermark to the finished file.

Does pdfcat upload my file?

This tool runs in your browser whenever the required capability is supported. Any hosted processing is clearly identified before upload.