Annotate a PDF

Highlight what matters, leave comments, and draw or stamp right on the page. Your markup is added in your browser, so the PDF never leaves your device.

On your deviceFree

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Annotate PDF at a glance

Annotate PDF is a free tool for marking up a PDF without rewriting it. You can highlight, underline and strike through text, add comments, draw freehand, and add shapes and stamps, then save the marked-up copy. It runs in your browser, so your file never leaves your device and no account is needed.

Limits · Files up to 1 GB each · One file at a time · Free and unlimited, no account needed

Last updated October 19, 2026

How to use Annotate PDF

Open the PDF
Choose your file or drop it here. It opens in your browser.
Mark it up
Highlight, underline, strike through, comment, draw or stamp anywhere on the page.
Save and share
Download the annotated PDF and send it on, or keep it with your notes.

What Annotate PDF does

Annotating a PDF means marking it up without rewriting it: highlighting lines, adding comments, crossing words out, drawing or stamping. Wispdf gives you highlight, underline and strikethrough, comments, freehand drawing, shapes and stamps, all in your browser. It suits reviewing drafts, studying and giving feedback, and your file never leaves your device.

People use it to

Highlight key passages in a course reader before your seminar
Comment on a designer's brochure proof instead of writing a long email
Strike through and question clauses in a lease before you reply

What's included

Highlight and underline

Mark the lines that matter, and strike through anything that should go.

Comments on the page

Pin a note exactly where it applies, so your feedback is easy to follow.

Draw and add shapes

Circle a figure, draw an arrow or sketch freehand with a mouse or your finger.

Stamp your pages

Add stamps so anyone can see at a glance where a page stands in a review.

Where your file goes

Annotate PDF runs entirely on your device. The file and every comment you add stay in your browser and are never uploaded to our servers.

On your deviceFree and unlimited, no account needed.

How privacy works at Wispdf

Questions about Annotate PDF

Is Annotate PDF free?

Yes. Annotate PDF on Wispdf is free and unlimited, with no account needed. Every tool, from highlights to stamps, is included. Because it runs on your device, there are no daily limits. The practical limit is your device's memory, comfortably around 1 GB of PDFs on a computer and less on a phone.

Do my comments or my file get uploaded?

No. Annotate PDF runs on your device, inside your browser. Your PDF and every highlight, comment and drawing you add stay with you. Nothing is sent to our servers, so there is nothing for us to store or delete. That makes it a comfortable choice for marking up contracts, exam papers or anything private.

How do I highlight text in a PDF?

Open Annotate PDF, choose your file and pick the highlight tool. Select the text you want to mark and it is highlighted. Underline and strikethrough work the same way. Add a comment beside a highlight if you want to explain why it matters, then save the annotated PDF to your device.

Can I make my markup permanent?

Yes. After you save from Annotate PDF, run the file through Flatten PDF. Flattening turns annotations into ordinary page content, so nobody can change them and they print the same everywhere. Keep an unflattened copy as well if you think you might want to edit or remove your comments later.

Can I annotate a PDF on an iPad or phone?

Yes. Annotate PDF works in any modern browser on iPad, iPhone, Android, Chromebook, Windows, Mac and Linux, and there is no app to install. Freehand drawing feels natural with a finger on a touch screen, while a keyboard makes long comments quicker to type.

Can I sign a PDF while I annotate it?

For a signature, use Sign PDF, which is built for it. You can draw, type or upload your signature, add initials and the date, and place them anywhere on the page. Saved signatures stay on your device. Like Annotate PDF, it is free and runs in your browser, so nothing is uploaded.