Further Support for Japanese Fonts in PDFs
In Japan, the most famous and commonly used novel posting site "小説家になろう(Shousetsuka ni Narou)" officially allows the download of vertical writing PDF files of their works. When attempting to view these files with your software, we encountered an issue where Japanese punctuation and symbols were garbled, appearing as □. However, these files can be viewed correctly with other software such as Acrobat Reader. Unfortunately, I cannot attach a PDF file here, but I can provide instructions on how to obtain such a file for testing: Go to the work page (e.g., https://ncode.syosetu.com/n2163n/ ). Click on "縦書きPDF(Vertical Writing PDF)" at the top of the page. Click the blue "縦書きPDFダウンロード(Download Vertical Writing PDF)" button at the bottom center of the page. We kindly request the addition of features or support to ensure these files can be correctly viewed with your software.
It would be useful to be able to edit the text of a .pdf as within a text box. As well as being able to add text boxes at will. A bit like in the software from the company with the uppercase A.
Modern UI for SumatraPDF
The current UI seems very outdated. I would love to see an updated UI that embraces more of the Windows 11 design style.
Changing color schemes/color scheme profiles (themes)
I changed my default colors to a monochrome green, but it makes some pdfs very unreadable. I'd like to be able to set up different color profiles (like notepad++ and emacs) and switch between them easily.
Windows Help Files (.hlp, WinHelp) support
Windows Help Files (.hlp extension) are unsupported in Windows 10/11. There is a workaround to install the old version of the help viewer from Windows 8, but it does not support high DPI and you need to bypass Windows file protection in order to install it. The .hlp files were used in old software, Win32 documentation, and e-zines, some of which are still interesting today. It's a pity that you cannot open them in the new Windows versions, so the knowledge contained in these files is lost. It would be great if SumatraPDF could open them and show the basic content (without full-text search / macros) just like it does for CHM files. There are open-source libraries like WinhelpCGI that can read the format. Thank you so much.
Implement smooth scroll with mouse wheel, touch pad and keyboard arrows, as in browsers. Also, if possible smooth zoom (when changing for example from 100% to 120%)
Allow customizing toolbar via advanced settings (add more actions and remove / change order of existing actions)