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Mofumi PDF

Draw on PDF

Draw, highlight, add shapes, arrows and text on PDF pages with pen and highlighter tools.

100% Private — files never leave your device
Upload PDFDrop files here or click to chooseAccepted: PDF Files never leave your device

About this tool

Draw on PDF is a digital scratchpad for your documents. Mark up drawings, circle problems, highlight passages, add arrows and short notes — with a mouse, finger or stylus.

Tools: pen, highlighter (translucent, multiplies like a real marker), eraser (removes whole strokes), line, arrow, rectangle, ellipse and text, in any colour and width. Undo and redo with the buttons or Ctrl+Z / Ctrl+Y.

Your marks are saved as vector graphics drawn onto the page, so they stay sharp and print exactly as shown. Everything happens privately in your browser.

Engines: pdfjs · canvas · pdf-lib

How to use

  1. 1

    Open your PDF.

  2. 2

    Pick a tool and draw on the page.

  3. 3

    Click “Save drawing” and download.

Use cases

  • Review drawings and plans

    Circle issues and add arrows on architectural or engineering PDFs.

  • Teaching

    Annotate worksheets and give feedback on assignments.

  • Study notes

    Highlight key points and jot notes in the margins.

Frequently asked questions

Can the marks be removed later?

They become part of the page content. Keep the original file if you may need a clean copy.

Does it work with a stylus?

Yes, pointer and touch input are supported.

Can I type Thai notes?

Yes, text uses the Sarabun font.

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