Skip to content

FastStone Image Viewer vs PngOptimizer

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

FastStone Image Viewer icon
FastStone Image Viewer
PngOptimizer icon
PngOptimizer

FastStone Image Viewer vs PngOptimizer: The Verdict

⚡ Summary:

FastStone Image Viewer: 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.

PngOptimizer: PngOptimizer is a free software that optimizes PNG images by losslessly compressing them to reduce file size. It works on Windows, Mac and Linux.

Both tools serve their respective audiences. Compare the features, pricing, and user ratings above to determine which best fits your needs.

Last updated: May 2026 · Comparison by Sugggest Editorial Team

Feature FastStone Image Viewer PngOptimizer
Sugggest Score
Category Photos & Graphics Photos & Graphics
Pricing Open Source

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

PngOptimizer
PngOptimizer

Description: PngOptimizer is a free software that optimizes PNG images by losslessly compressing them to reduce file size. It works on Windows, Mac and Linux.

Type: software

Pricing: Open Source

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
PngOptimizer
PngOptimizer Features
  • Losslessly compresses PNG files to reduce file size
  • Supports PNG, APNG and MNG file formats
  • Works on Windows, Mac and Linux
  • Has command line interface and GUI
  • Preserves transparency and metadata
  • Batch optimization of multiple images
  • Drag and drop support
  • Custom compression levels

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
PngOptimizer
PngOptimizer

Pros

  • Free and open source
  • Simple and easy to use
  • Effective compression to reduce file sizes
  • Cross-platform compatibility
  • Preserves image quality
  • Fast batch processing
  • Actively developed and maintained

Cons

  • Limited to PNG file format only
  • No advanced editing features
  • Compression results can vary
  • GUI is basic and minimal
  • Requires technical knowledge to use CLI

Pricing Comparison

FastStone Image Viewer
FastStone Image Viewer
  • Not listed
PngOptimizer
PngOptimizer
  • Open Source

Ready to Make Your Decision?

Explore more software comparisons and find the perfect solution for your needs