FastStone Image Viewer

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FastStone Image Viewer
Developer(s)FastStone Soft
Initial release2004
Stable release
7.6 / 31 March 2022; 2 months ago (2022-03-31)
Written inDelphi
Operating systemWindows XP/Vista/7/8/10
Available inEnglish, multilingual available
TypeImage viewer
LicenseProprietary, free for non-commercial use

FastStone Image Viewer is an image viewer and organizer for Microsoft Windows, provided free of charge for personal and educational use, as of version 7.0. The program also includes basic image editing tools.



  • 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 (partial, it ignores the monitor profile)
  • 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 (such as JPEG).
  • 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.

Other features include:


The FastStone Image Viewer was first released in 2004 by FastStone Soft. Since then, new stable versions have been released regularly.

Since version 3.1, a multilingual version has been available, supporting Simplified and Traditional Chinese, Danish, Dutch, French, German, Hungarian, Italian, Norwegian, Polish, Portuguese, Russian, Spanish, and Swedish.

This Windows program is provided in three forms: as a normal-install executable, a zip file of the same, or as a fully portable no-install zip file.

According to FastStone, version 2.7 and all previous releases have been found to be using improperly licensed images and icons, and as a result, FastStone requested that version 2.7 and older copies of FastStone Image Viewer cease to be used, with all licenses updated to version 2.8 for both free and commercial versions. This announcement was made on their web site the same date that version 2.8 was posted.


  • As of version 4.2, resizing of animations (i.e. animated GIFs) 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, more so the first time when the thumbnail cache database is built.
  • The portable version (from PortableApps) sometimes has problems saving its settings, ignoring them at random. Quitting and restarting the app (not PortableApps or the underlying OS) usually solves this problem.

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