FastStone Image Viewer is described as 'Fast, stable Windows-compatible image viewer and editor with extensive browsing, conversion, and editing features, including slideshows and EXIF info' and is a very popular Image Viewer in the photos & graphics category. There are more than 100 alternatives to FastStone Image Viewer for a variety of platforms, including Windows, Mac, Linux, Flathub and iPad apps. The best FastStone Image Viewer alternative is XnView MP. It's not free, so if you're looking for a free alternative, you could try XnView MP or IrfanView. Other great apps like FastStone Image Viewer are ImageGlass, XnView Classic, Photoscape and qView.
Comprehensive photo management software for viewing, batch converting, editing and resizing images and creating thumbnail sheets.
Most users think XnView MP is a great FastStone Image Viewer alternative.
Compact and efficient image application offering viewing, editing, and conversion with batch processing, multi-language support, plugin extensibility, and ad-free operation suitable for Windows and portable use.
IrfanView has no organizing options. It's a pure viewer. FastStone is an organizer which includes a viewer.
Most users think IrfanView is a great FastStone Image Viewer alternative.
nomacs is a free, open source image viewer, which supports multiple platforms. You can use it for viewing all common image formats including RAW and psd images.
Editing option are not great
Most users think nomacs is a great FastStone Image Viewer alternative.
A feature-rich, simple-to-use app seamlessly integrated with a clean, minimal and modern user interface.
XnView Classic is an efficient image viewer, browser and converter for Windows with built-in support for over 500 image formats.
PhotoScape is a fun and easy photo editing software that enables you to fix and enhance photos.
Fast and lightweight Qt-based image viewer with support for Windows, macOS, and Linux. Features include multiple format support, customizable interface, GIF playback, high-resolution display compatibility, and efficient navigation through keyboard shortcuts.
Offers quick browsing and display of various image formats, basic editing tools like crop, rotate, lossless JPEG manipulation, folder browsing as thumbnails or slideshows, supports XCF, drag-and-drop, metadata viewing, KDE integration, and plugin extensions.
PicView is a fast, free and fully customizable picture viewer for macOS and Windows 10/11. It supports virtually all image file types, including (animated) WEBP, (animated) GIF, SVG, AVIF, HEIC, PSD and many others.
Lightweight Simple Image Viewer with Slide show feature, Resize and Lossless-cut, Color correction, Rename, Multi-language and more...
Offers organization, viewing, and editing tools for digital images, supports over 700 RAW formats, enables metadata embedding and syncing, dynamic category and keyword filters, workflow optimizations, non-destructive edits, detailed image preview, and sharing options.
Qt5 image viewer with optional video support. Ability to quickly copy / move images to different folders. Can open some extra formats (JPEG-XL, AVIF, APNG, HEIF/HEIC, RAW) via third-party image plugins.
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Because, XnView have many functions and it's a multi platform application.