Compress your images/pictures up to 90% without visible quality loss

Caesium Image Compressor
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Caesium Image Compressor

  -  21.2 MB  -  Open Source
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  • Latest Version

    Caesium Image Compressor 2.8.5 LATEST

  • Review by

    Sophia Jones

  • Operating System

    Windows 7 / Windows 8 / Windows 10 / Windows 11

  • User Rating

    Click to vote

  • Author / Product

    SaeraSoft & Matteo Paonessa / External Link

  • Filename

    caesium-image-compressor-2.8.5-win-setup.exe

Caesium Image Compressor is a free, open-source, advanced compression tool for photos and images (JPG, PNG, GIF), supporting batch, preview, and many more.

Caesium saves space and makes uploads faster. Caesium Image Compressor is a multiple award-winning software developed for simplicity and effectiveness.

With more than one million worldwide downloads, Caesium Image Compressor is one of the most popular image optimization software available, helping photographers, bloggers, webmasters, businesses, and casual users in storing, sending, and sharing digital pictures.

Providing a simple yet effective interface with a real-time preview and multiple image processing at the same time, everyone will be able to reach the best result. Advanced users will find extra features, like metadata storing options or folder structure support.

Features and Highlights
  • Reserve the original file format without losing any visual quality
  • No additional software required to open compressed files
  • Process files in batch mode
  • Choose the compression level with a simple slider
  • Choose the different compression levels of each image
  • Support for custom suffix
  • Side-by-side (comparison) preview, with original and compressed pictures
  • View details using the zoom function
  • You can customize visualization options
  • Support for common file formats
  • Support for date/time and metatag
What’s New
  • Improved font rendering to fix display issues in the interface and image previews.
  • Updated installer scripts and refreshed multiple language files for better setup reliability and localization support.
  • Enhanced compression workflow by automatically refreshing the entire image tree table after processing is completed.
  • Added German language translation support.
  • Prepared groundwork for the upcoming v3.0 release focused on major feature improvements and community-requested enhancements.
How to Use
  • Install the software by following the setup instructions
  • Launch the Caesium Image Compressor on your PC
  • Click "Add" to import images for compression
  • Set compression level using the quality slider
  • Choose the output folder for compressed images
  • Click "Compress" to start the process
  • Review compressed files in the output folder
FAQs

What is Caesium Image Compressor, and what does it do?
Caesium Image Compressor is a free image optimization tool designed to reduce image file sizes while preserving visual quality. It supports formats like JPG, PNG, and WebP, and allows users to compress multiple images in batches, making it useful for websites, storage saving, and faster image uploads.

Is Caesium Image Compressor still actively developed in 2026?
Yes, Caesium is still actively maintained in 2026. The GitHub releases page shows ongoing updates, bug fixes, and development activity, including newer versions that improve compatibility and stability. The project has transitioned into a more modern open-source workflow compared to its earlier standalone-only development.

Why do many users prefer Caesium over online image compressors?
Many users prefer Caesium because it works locally on the PC instead of uploading images to cloud services, which improves privacy and speeds up bulk compression workflows. It’s also lightweight, easy to use, and offers users more control over compression levels and output quality than many web-based compressors.

System Requirements
  • Operating System: Windows 11, 10, 8, or 7
  • Processor: Intel/AMD 1 GHz or faster
  • RAM: 2 GB minimum
  • Storage: 100 MB of free disk space
  • Display: 1024x768 resolution or higher
PROS
  • Simple and user-friendly interface
  • Supports batch image compression
  • Preserves original image format
  • Fast processing speed
  • Reduces file size without much quality loss
CONS
  • Limited editing features
  • No support for RAW formats
  • No cloud storage integration
  • Interface lacks modern design
  • Occasional bugs or crashes


Download Caesium Image Compressor Latest Version
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  • Caesium Image Compressor 2.8.5 Screenshots

    The images below have been resized. Click on them to view the screenshots in full size.

    Caesium Image Compressor 2.8.5 Screenshot 1
  • Caesium Image Compressor 2.8.5 Screenshot 2

What's new in this version:

Fixed:
- Fix to font not showing correctly

Changed:
- Update installer script and language files
- Update Cmakelist.txt
- Update entire CImageTreeModel table on compression finish
- Add german translation

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