PDF Annotator – Annotate PDF Online
PDF Annotator is a free browser-based tool to highlight, comment, sign and draw on any PDF. Nothing ever leaves your device — no upload, no signup, no watermark.
Everything you need to mark up a PDF
A full annotation toolkit that runs entirely in your browser. Open a document and go.
Annotate & comment
Highlight text, drop sticky notes, add typed text anywhere on the page.
Sign documents
Draw, type, or upload your signature. Auto-remove the paper background, crop, recolor — reuse next time.
Fill forms
Type into existing AcroForm fields or add your own text and checkbox fields to any PDF.
Draw & mark up
Freehand pen, straight lines, arrows, rectangles, circles, checkmarks and crosses.
Your PDF stays on your device. Nothing is uploaded to a server.
Open a file and start editing. No account, no email, no wait.
Everything runs after the first load. No servers to reach, no internet required.