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 4.7 (January 28, 2013)
* Added Touch Interface (tap, swipe, pinch) support throughout the application
* Added a new mouse gesture to move between images: Click at the bottom part of the preview window to switch to the next/preview image
* Improved the Copy/Move dialog. Now it shows an image comparison window and allows you to select Replace, Skip and Rename when handling file name conflicts
* Added an option to let you manually select which photos to download in the "Download Photos" tool
* Improved the Print dialog
* Added a new browser mode (under menu "View"->"Layout"), which provides a bigger image viewing area
* Added a "Reduce Noise" tool
* Improved the Straighten/Rotate dialog. Now it is possible to preserve aspect ratio when rotating an image
* Improved the "Set Wallpaper Anywhere on Desktop" tool with "Drop Shadow" and "Cut" effects
* Improved the "Text" tool in "Draw Board". Now you can see a preview of fonts in the font name list
* Improved "Crop Board" by adding "Original Ratio" to the "Paper Ratio" list
* Improved "Image Comparison" by adding an option to Auto-Fit images to the window
* Improved folder navigation in Windows Libraries
* Updated the RAW format library. Added support for SRW, NRW, RWL files. Added an option in the Raw tab of the Settings to enable/disable Raw files
* Added a new skin called OSX
* Many other minor improvements and bug fixes