Annotate PDF Online
Highlight text, add comments, sticky notes, and markup tools to any PDF. Free, private, and browser-based — no uploads ever.
Select a PDF to annotate
Drag & drop your PDF file here, or click to browse. Start annotating immediately.
How to annotate a PDF online
Open your PDF
Upload the PDF you want to annotate from your device or drag it into the editor.
Add annotations
Use the toolbar to highlight text, add sticky notes, draw shapes, underline, or strike through content.
Save annotated PDF
Click Download to save your annotated PDF with all comments and markups embedded.
100% Private
Your PDF never leaves your browser. All annotation happens locally on your device.
Full Annotation Toolkit
Highlight, underline, strikethrough, sticky notes, arrows, shapes, and freehand drawing.
Free Forever
No subscription or account required. Full annotation tools available for free.
Reader-Compatible Output
Annotations are embedded as standard PDF annotations — visible in Acrobat, Preview, and all major readers.