Basic Annotation

experimental

Mark up a page with a pen or highlighter on a canvas overlay, then flatten your annotations back into the PDF.

Runs in browserIn: PDF → Out: PDF

Drop your file here or click to browse

Select a single file

Files are read locally — never uploaded

Add a file to enable processing.

This tool runs entirely in your browser. Your file is read into this tab, processed on your device, and never uploaded to PDFDig or any third party. Closing the tab clears it from memory.

Frequently asked

Are annotations editable later?+

No — marks are flattened into the page image for the annotated page, which keeps the result portable but not re-editable.