It would be great to see the comment for all annotations in a column, just like Acrobat, without having to click on each annotation to see it's comment. The way it is now, it is impossible to look for something which was commented in a book with many annotations (and comments), bacause you would need to click on every annotation to see what's the comment.

Also, free-hand highlighting for documents without OCR.

i just use highlights, so could be amazing if we could change the color of highlights, more... handly and more colors, the rest is amazing: tabs, resources, size.. everything (to me).

I came here to propose what Alex already proposed. A window showing all the annotations in the document (with the respective comments). One of the main reasons of annotating is to be able to quickly find these highlights later when needed.

Please add some simple/quick keyboard shortcuts for different colors for highlights. It would be quite a big quality-of-life over just pressing for one color (yellow). Or a hover menu for annotation colors if possible like other PDF readers.

Why not integrate the Annotations window similar to how Bookmarks are integrated? Having Annotations open in a separate window is inconvenient. I usually place it right next to the PDF body anyway.

Additionally, I have a more specific proposal that could significantly enhance the user experience. Allowing users to save their color settings would be a game-changer. It's currently inconvenient to keep switching between color settings for annotations. By enabling the storage of user settings—such as ten favorite colors—you could greatly improve usability. Essentially, there are two parameters to store: color name and opacity setting. Please see the attached screenshot for a visual proposal. (P.S.: Sumatra is fantastic, and the developers are doing an excellent job! My utmost respect and support go out to their work.)

Inserting image annotions would be great, when you are required to "sign" the document

Yes, It would be handy for me to quickly add green check marks, red cross marks and yellow attention !-sign marks with just some right clicks.

As a further addition, semaphore-colored square boxes to highlight an area, instead of text, would be used with the same goal.

This application is currently a lightweight PDF reader that consumes minimal memory and responds quickly. However, I would like to enhance its functionality to include quick annotation capabilities with features. By incorporating these additions, SumatraPDF will transform into an ideal PDF reader for individuals who frequently work with PDFs. Though I have discovered it in the command palette, it is not functioning yet. I eagerly anticipate the implementation of this functionality.

Better Free-text. Boxes need to be resizable and a more intuitive editing would really help. Foxit free-text resizing is now broken, and current Sumatra feels even more awkward.

Also, area highlight (like Foxit, but movable); it's much more versatile and looks better than line highlights.

As mentioned elsewhere, signature stamps (not cryptographic signatures) is a major time saver and recently got nerfed in Foxit as well.