Annotate PDF

Highlight and draw on a PDF — mark up any page with a highlighter or freehand pen, then download a copy with the marks baked in. All in your browser.

Load a PDF, choose Highlight or Pen, and mark up the page. The marks are baked into a new PDF — in your browser.

Drop a PDF here, or click to browse .pdf · stays on your device

How to Annotate a PDF

Three steps, all in your browser.

1

Add your PDF

Drag in a PDF or click to browse. The first page appears ready to mark up.

2

Highlight or draw

Choose Highlight or Pen, pick a colour, and drag on the page. Switch pages to annotate more; use Undo or Clear page as needed.

3

Save and download

Click Save Annotated PDF to download a copy with every mark baked in.

Frequently Asked Questions

How do I annotate a PDF?
Load your PDF, choose the Highlight or Pen tool and a colour, then drag on the page — highlight makes a translucent box, pen draws freehand. Move between pages to mark more, then click Save Annotated PDF.
Can I annotate more than one page?
Yes. Use the page selector to move through the document; each page keeps its own marks, and all of them are baked into the final PDF.
Can I undo a mark?
Yes. Undo removes the last mark on the current page, and Clear page wipes that page’s marks. Your original file is never changed — you only download a new copy.
Is my PDF uploaded?
No. Pages are rendered locally and the marks are drawn into the PDF in your browser with pdf-lib. Nothing is uploaded — closing the tab clears everything.