FastStone Image Viewer

Features

• Relatively fast HQ image thumbnail viewing, using Lanczos resampling algorithm
• Support for multi-monitor configuration
• Custom order arranging, via drag-and-drop, and automatic renumbering
• Batch operations including rename and convert
• Color space management
• Magnifier lens
• Portable version to be used without installation, typically installed on USB flash drive, including all user settings.
• Preview of quality loss when saving in lossy file formats.
• If in fullscreen mode, pops up an image gallery, detailed image information, editing options, or program options at the border being touched by the mouse.

• Supports all major graphic formats, with a focus on popular digital camera RAW formats such as Canon's CR2 and CR3, and Sony's ARW.
• Displays Exchangeable image file format camera information
• Thumbnail cache and database
• Basic image editing tools: resizing, cropping, color correction, red-eye removal
• Advance image editing tools: clone brush, curve, levels, and unsharp mask.
• Lossless JPEG rotation and cropping
• Side-by-side image comparison tool
• Fully customizable contact sheet Builder*Emailing
• Memory card image retriever
• Slide show, including music and many transition effects
• Emailing

  Versions

Issues

• As of version 4.2, resizing of animations is not supported. Thus they can only be viewed at 100% scale, this includes thumbnails.
• When the program starts, a delay may occur as the thumbnail view is managed, moreso the first time when the thumbnail cache database is built.
• The portable version sometimes has problems saving its settings, ignoring them at random. Quitting and restarting the app usually solves this problem.