New in the SumatraPDF [pre-release builds](https://www.sumatrapdfreader.org/prerelease):

## Current search match stands out

When searching, the current match is now highlighted with your `FixedPageUI.SelectionColor` and all other matches use a secondary orange color, so it's easy to see which match you're on ([#5740](https://github.com/sumatrapdfreader/sumatrapdf/issues/5740)).

![Search results with the current match in yellow and the other matches in orange](https://files.sumatrapdfreader.org/assets/sumatrapdf/changelog/img/search-current-match-3e25.png)

## Toolbar buttons for external viewers with text or SVG icons

External viewers configured in the `ExternalViewers` advanced setting can now appear as toolbar buttons, using the new `ToolbarText` (text label) or `ToolbarSvgIcon` (SVG icon) parameters ([#5741](https://github.com/sumatrapdfreader/sumatrapdf/issues/5741)).

![Toolbar with two external viewer buttons at the end: a text button "Notepad" and a folder SVG icon](https://files.sumatrapdfreader.org/assets/sumatrapdf/changelog/img/toolbar-external-viewers-3b93.png)

## Find in CHM help files

`Ctrl + F` in CHM files now opens a find bar to search the current page, and the toolbar's Search button is available for CHM documents too. App keyboard shortcuts also work while the CHM page has focus ([#5735](https://github.com/sumatrapdfreader/sumatrapdf/issues/5735)).

![Find bar searching a CHM help file, with matches highlighted on the page](https://files.sumatrapdfreader.org/assets/sumatrapdf/changelog/img/chm-find-8ebb.png)

## "Errors in document" notification

When a document loads with errors, a notification "Errors in document" appears with a link that opens the Show Errors dialog.

![Notification "Errors in document" in the corner of the window, with an Errors link](https://files.sumatrapdfreader.org/assets/sumatrapdf/changelog/img/pdf-errors-notification-3424.png)

## One-click updates for pre-release builds

Pre-release builds check for updates at every startup. When a newer build is available, a notification in the bottom-left corner offers **Download and update**, which downloads and installs it without further prompts.

## More related file extensions recognized

`.ai` (Adobe Illustrator, opens as PDF), `.ora`, `.djv` (DjVu), `.xod` and `.dwfx` (XPS) files are now recognized and opened with the matching viewer ([#1678](https://github.com/sumatrapdfreader/sumatrapdf/issues/1678)).

## `-dump-chm` command-line flag

New `-dump-chm <file>` command-line option lists the contents of a CHM file and prints its table of contents and index information, without opening a window (for diagnostics).

More: [changes from June 24, 2026](https://www.sumatrapdfreader.org/docs/Changelog-2026-06-24) and the [full changelog](https://www.sumatrapdfreader.org/docs/Changelog).