PreviewQt

PreviewQt is a very simple application for previewing a wide range of files. Its main aim is on speed, striving to provide a preview as instantaneously as possible. It achieves this by being very lightweight and by its ability to sit in the system tray, ready to show whatever is thrown at it.

Supported file formats include:

Images: more than 140 formats, including photo spheres, panoramas, and motion photos

Video/Audio: all common formats

Documents: PDF and office documents, including page navigation

Archives: All common compressed archives (zip, etc.) by loading any supported file contained within

Comic Books, including page navigation

E-Books (epub), including page navigation and remembering where you left off

Text files, including syntax highlighting and prettifying output for certain formats

Windows DLL/EXE: Information about these files, including any embedded version information

PhotoQt: Information about PhotoQt's backup and extension files

MuseScore: Rendering score sheets including page navigation

ICC color profiles: display information about color profiles including gammut plots

Packages: Display information about DEB and RPM packages including AppImage files

SQLite database files: Show structure and meta information about sqlite database files

URL: Support for loading Websites (both local and remote), including pre-processing with yt-dlp for directly streaming contained media

Any file you encounter that is not yet supported by PreviewQt, please don't hesitate to get in touch. PreviewQt strives to one day support as many file types as possible.

If you are using KDE's Dolphin file manager, PreviewQt can be invoked by shortcut to load whichever file is currently highlighted to allow for previewing any file easily without having to set PreviewQt as default application. You can also pass files to PreviewQt by simply dropping them onto the application window, or by means of a remote application (small square) wth any file dropped on it passed on to PreviewQt. If you are running KDE Plasma 6, there is also a plasmoid that integrates nicely with your desktop.

If you like the overall concept of PreviewQt but would like to have more features, check out the fully featured image viewer PhotoQt, a sibling application to PreviewQt.