FastStone Image Viewer is a fast, stable, user-friendly image browser, converter and editor. It has a nice array of features that include image viewing, management, comparison, red-eye removal, emailing, resizing, cropping, retouching and color adjustments. Its innovative but intuitive full-screen mode provides quick access to EXIF information, thumbnail browser and major functionalities via hidden toolbars that pop up when your mouse touches the four edges of the screen. Other features include a high quality magnifier and a musical slideshow with 150+ transitional effects, as well as lossless JPEG transitions, drop shadow effects, image annotation, scanner support, histogram and much more.

FastStone Image Viewer supports all major graphic formats (BMP, JPEG, JPEG 2000, animated GIF, PNG, PCX, PSD, EPS, TIFF, WMF, ICO and TGA) and popular digital camera RAW formats (CRW, CR2, NEF, PEF, RAF, MRW, ORF, SRF, ARW, SR2, RW2 and DNG).

Features
* Image browser and viewer with a familiar Windows Explorer-like user interface
* Support of many popular image formats:
* True Full Screen viewer with image zoom support and unique fly-out menu panels
* Crystal-clear and customizable one-click image magnifier
* Powerful image editing tools: Resize/resample, rotate/flip, crop, sharpen/blur, adjust lighting/colors/curves/levels etc.
* Eleven re-sampling algorithms to choose from when resizing images
* Image color effects: gray scale, sepia, negative, Red/Green/Blue adjustment
* Image special effects: annotation, drop shadow, framing, bump map, sketch, oil painting, lens
* Draw texts, lines, highlights, rectangles, ovals and callout objects on images
* Clone Stamp and Healing Brush
* Superior Red-Eye effect removal/reduction with completely natural looking end result
* Multi-level Undo/Redo capability
* One-touch best fit/actual size image display support
* Image management, including tagging capability, with drag-and-drop and Copy To/Move To Folder support
* Histogram display with color counter feature
* Compare images side-by-side (up to 4 at a time) to easily cull those forgettable shots
* Image EXIF metadata support (plus comment editing for JPEGs)
* Configurable batch processing to convert/rename large or small collections of images
* Slideshow creation with 150+ transition effects and music support (MP3, WMA, WAV...)
* Create efficient image attachment(s) for emailing to family and friends
* Print images with full page-layout control
* Create fully configurable Contact Sheets
* Create memorable artistic image montages from your family photos for personalized desktop wallpapers (Wallpaper Anywhere)
* Acquire images from scanner. Support batch scanning to PDF, TIFF, JPEG and PNG
* Versatile screen capture capability
* Powerful Save As interface to compare image quality and control generated file size
* Run favorite programs with one keystroke from within Image Viewer
* Offer portable version of the program which can be run from a removable storage device
* Configurable mouse wheel support
* Support multiple program skins
* Support dual-monitor configurations
* And much more...

Version 4.6 (June 29, 2011)
- Improved the "Acquire Images from Scanner" tool
- Other minor improvements and bug fixes