Annotate a PDF online: highlight, comment, draw
Highlight, underline or strike through a passage, draw freehand, frame an area, add a text box, a pinned comment or an image stamp such as your logo. Annotations are saved in the standard PDF format, and everything happens in your browser: the file never leaves your device, with no account and no limits.
Drop your PDF here
or choose a file on your computer, tablet or phone
100% local reading: the document is never sent over the internet.
How to annotate a PDF online in three steps
- 1
Open the PDF
Drag the file into the reader or pick it from your device, then open the Annotate tool.
- 2
Pick a tool and a colour
Select text to highlight, underline or strike it through, or draw directly on the page: freehand, frame, text box, comment or stamp, in five colours.
- 3
Apply and save
Apply your annotations, review the document, then save the annotated PDF or send it for signature.
Everything happens in your browser: the file never leaves your device. Open in the reader
Related tools and guides
- ↑ Free tools
- → Read a PDF online with nothing to install
- → Edit the text of a PDF
- → Redact sensitive information in a PDF
- → Make a scanned PDF searchable with OCR
- → Compare two versions of a PDF
- → Reorder, rotate and delete pages
- → Merge several PDFs into one
- → Split a PDF into several files
- → Compress a PDF to send it by email
- → Password-protect a PDF
- → Convert JPG or PNG images to PDF
- → Sign a PDF online, step by step
- → Handle your PDFs from Chrome with the Certyneo extension
Annotating PDFs: frequently asked questions
Are the annotations visible in Adobe Acrobat?
Yes. Highlights, comments, drawings and stamps are written as real, standard PDF annotations: Adobe Acrobat and other PDF readers display them and let you edit or delete them.
What kinds of annotations can I add?
Highlight, underline and strikethrough on a selection, freehand drawing, frame, text box, pinned comment and image stamp, all in five colours.
Can I put my logo or a stamp on a PDF?
Yes, with the image stamp: choose a PNG or JPG file, such as a logo, a company stamp or a scanned signature, then place it on the page. A scanned signature is only an image: to bind a signer, use an electronic signature.
Is my document sent over the internet?
No. Annotations are added in your browser. Certyneo never receives your PDF and nothing is kept once the tab is closed.
Can I annotate a PDF on a tablet or phone?
Yes, in a recent browser on Android, iPhone and iPad, with no app to install. The annotations you get are the same as on a computer.
Does this PDF need to be signed?
Send it for electronic signature in minutes: your signers sign from their phone, without creating an account.
Get started with Certyneo for free