Caesium has a new App for mobile devices! Get the Closed BETA access NOW!

Simple, fast and effective.

If you are a heavy photographer you can save up to 90% of space on your device or quickly share your photos to your friends or clients online.
If you are a webmaster or a blogger, make sure your images are optimized to avoid annoying loading times for your visitors.

Image compression made easy

Caesium is award winning software developed for simplicity and effectiveness.

With more than one million worldwide downloads, Caesium is one of the most popular image optimization software available, helping photographers, bloggers, webmasters, businesses or casual users at 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 subfolder structure support.

All for free with multilanguage interface.


Discover what Caesium can do for you

Batch Processing

Compress hundreds photos at the same time. You can set different compression levels for each one, according to your needs. You can also keep the original directory structure, useful for webmasters.

Instant preview

Before compressing, you can check the result in a easy two-panel view for each picture and judge Caesium's work by yourself. If the result is fine, you'll just have to click on the compress button.

Completely free

Caesium is free. Completely. You can download it, use it - even in your business - and browse the source code available online. You won't pay anything for it and you'll always have full features access.

Want to help?

You can actively contribute to the project.


Type Version Description
Installer 1.7.0 Windows installer. Default option. Download Mirror
Portable 1.7.0 Windows portable version for USB drives. Download Mirror
Source Code 1.7.0 Source code for developers. Download
CaesiumCLT BETA Caesium Command Line Tools code preview for Linux/OSX.* GitHub Repo
CaesiumPH BETA Caesium for photographers featuring lossless JPEG compression. GitHub Repo
* This is also the code that will be used in Caesium 2.0, featuring a huge quality/speed improvement.
Full file list/versions on sourceforge


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