Sumatra PDF is a PDF, ePub, MOBI, CHM, XPS, DjVu, CBZ, CBR reader for Windows

Annotate (highlight / add comments) with SumatraPDF

How to add texts and notes when you read PDF?

Highlight Annotation has generally been available in Pre-release for a long time. Now both text comment and free text have been added (amongst others).

Current Pre-release allows you to annotate PDF (only)


Previous experiments to highlight other file formats in FixedPageUI (only) using .smx are now retired.

To highlight selectable text, simply select by swiping with left button down, then as before press A (or use the context menu to Create Anotation > Highlight)

currently highlights CANNOT BE MOVED you need to replace (and delete the original). Color and other appearances can be changed.
Objects such as Carets, Comments, Stamps etc. can be moved by dragging.
Free text is currently not free-form to alter size so for now simply set the boundary to 0