SumatraPDF new features: April 10, 2026

New in the SumatraPDF pre-release builds: Change Background Color Change Background Color (CmdChangeBackgroundColor, command palette) opens a color picker to change the background color for the current file or for all files of the same type. It has swatches for saved custom colors (CustomColors). New settings EBookUI.BackgroundColor, ComicBookUI.BackgroundColor and ImageUI.BackgroundColor set the background for ebooks, comic books and images. All background color settings accept checkered for a transparency checkerboard. External viewers as toolbar buttons The ToolbarText option for ExternalViewers adds a toolbar button that opens the document in that external viewer (#5313). WOFF fonts and more print copies Documents that embed WOFF fonts display correctly (#944). -print-settings allows up to 9999 copies (#5509). The Scrollbars setting moved from FixedPageUI to the top level. More: changes from April 10, 2026 and the full changelog.