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FastStone Image Viewer vs UPX

Professional comparison and analysis to help you choose the right software solution for your needs.

FastStone Image Viewer icon
FastStone Image Viewer
UPX icon
UPX

FastStone Image Viewer vs UPX: The Verdict

Last updated: May 2026 · Comparison by Sugggest Editorial Team

Feature FastStone Image Viewer UPX
Sugggest Score
Category Photos & Graphics Os & Utilities
Pricing Free

Product Overview

FastStone Image Viewer
FastStone Image Viewer

Description: FastStone Image Viewer is a free, lightweight image viewing and organizing program. It has an intuitive interface and supports a wide range of image formats like JPEG, GIF, PNG, BMP as well as raw formats from major DSLRs. Useful features include batch editing tools, screen capture, color schemes, and the ability to view images in full screen slideshows.

Type: software

UPX
UPX

Description: UPX is an open source executable packer that can compress and optimize executable files for Windows, Linux, macOS, and other platforms. It works by analyzing executables, removing unused code and data, and compressing what remains. UPX aims to reduce file size while allowing compressed binaries to launch and run normally.

Type: software

Pricing: Free

Key Features Comparison

FastStone Image Viewer
FastStone Image Viewer Features
  • Supports all major image formats (JPEG, TIFF, PNG, GIF, BMP, PCX, TGA, WMF, ICO, etc)
  • Powerful image viewing features (zooming, panning, rotating, scrolling, drag-and-drop, etc)
  • Many image processing tools (resize, crop, color adjustments, add text/watermark, etc)
  • Batch conversion tools for converting images between formats, resizing, renaming, etc
  • Screen capture tool
  • Slideshow function
  • Basic image editing (brightness, contrast, saturation, etc)
  • Support for RAW files
  • Thumbnail preview pane
  • EXIF and IPTC metadata viewer
UPX
UPX Features
  • Compresses executable files
  • Supports Windows, Linux, macOS and other platforms
  • Open source and free to use
  • Removes unused code and data
  • Compressed binaries can still run normally

Pros & Cons Analysis

FastStone Image Viewer
FastStone Image Viewer
Pros
  • Free and open source
  • Intuitive and easy to use interface
  • Fast and lightweight
  • Supports many image formats
  • Lots of useful viewing, editing and organizing features
Cons
  • Lacks some advanced editing features of paid software
  • No cloud sync or storage features
  • No mobile app version
  • Limited batch editing capabilities compared to Lightroom
UPX
UPX
Pros
  • Reduces file size significantly
  • Faster download and loading times
  • No runtime memory overhead
  • Compressed binaries are self-extracting
  • Retains original file permissions and attributes
Cons
  • Compression results vary
  • Incompatible with some anti-virus software
  • Not designed for already compressed files
  • Requires decompression before debugging/modifying
  • Limited to compressing executables

Pricing Comparison

FastStone Image Viewer
FastStone Image Viewer
  • Not listed
UPX
UPX
  • Free

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