Annotate a PDF — highlight, draw, comment
Highlight, draw, and comment on PDFs in your browser. No upload, no signup.
Files are processed entirely in your browser. Nothing is uploaded to any server.
About this tool
Annotating a PDF means adding your own marks to the document without changing the original content. Reviewers highlight key passages before a meeting, editors leave comments on draft contracts, students underline important paragraphs, and collaborators draw attention to specific diagram regions. Annotate PDF gives you the standard annotation toolkit — highlight, underline, strikethrough, freehand drawing, and sticky notes — in a browser tab.
Annotations are stored as standard PDF annotation objects, which means when the recipient opens the file in Adobe Acrobat, Apple Preview, or any other compliant reader, they see the same marks. Reviewers can reply to sticky notes in their own reader if they have a full PDF editor. You can also delete any annotation before exporting — select it in Edit mode and press Delete.
Multi-page documents are fully supported. Navigate between pages, annotate whichever pages need markup, and export once. The finished PDF contains all annotations baked into the file as first-class objects. Because annotations are added locally in your browser, the document content is never sent to a server.
How it works
- 1
Open the PDF
Drop or pick the file you want to annotate.
- 2
Mark it up
Highlight, underline, draw, or add sticky notes.
- 3
Download
Export with your annotations baked in.
Frequently asked questions
Will my annotations be visible in Adobe Reader?
Can I delete annotations later?
Is the file uploaded?
Multi-page support?
Touch / pen support?
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Embed this tool
Let your visitors use Annotate PDF without leaving your site. Paste the snippet below into any HTML page. Files stay private — everything runs in the visitor's browser.
<iframe
src="https://pdfwox.com/embed/annotate-pdf"
width="100%"
height="600"
style="border:none;border-radius:8px"
title="annotate-pdf tool"
allow="downloads"
loading="lazy"
></iframe>
<script>
window.addEventListener('message',function(e){
if(e.data&&e.data.type==='privpdf-resize'){
var f=document.querySelector('iframe[src="https://pdfwox.com/embed/annotate-pdf"]');
if(f)f.style.height=e.data.height+'px';
}
});
</script>The embed runs entirely in the visitor's browser — no files are uploaded. The iframe resizes automatically to fit its content via postMessage.
Deeper guide