Caesium Image Compressor

Try it directly on browser at caesium.app

v2.8.2

Special Thanks

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What is it for

Caesium is an image compression software that helps you store, send and share digital pictures, supporting JPG, PNG and WebP formats. You can quickly reduce the file size (and resolution, if you want) by preserving the overall quality of the image.

Supported Platforms

• Windows: 10 (build 1809 or later) (use old version v1.x for Windows 7 or 8 - link)
• MacOS: 10.15+
• Linux: tested on Ubuntu 22.04 and Manjaro

Note: only 64bit versions are supported

Installation

Head to the releases' page for the available downloads.

• Windows: installer and portable versions are available
• MacOS: DMG package
• Linux: compile the source code yourself, or download binary from third-party build

Note that the main branch can contain unstable code. If you want to build on a stable version, use a tagged version.

Troubleshooting and/or feature request

Please open an issue.

Build from source

Requirements

• Rust: required to compile libcaesium. Make sure you have cargo executable on you $PATH
• Qt6 SDK: binaries are built on 6.8.0 (open source)
• libssh: macOS only
• Sparkle: macOS only. Only version 1.27.1 is supported.

Build

Step 0 (macOS Only)

You need to set up Sparkle in order to compile the project

brew install --cask https://raw.githubusercontent.com/Homebrew/homebrew-cask/c6dfe6baf1639998ba1707f68668cf8fa97bac9d/Casks/sparkle.rb
sudo cp -R /usr/local/Caskroom/sparkle/1.27.1/Sparkle.framework /Library/Frameworks/Sparkle.framework

Step 1

You need to configure CMake first and the command is slightly different for all the platforms: Change the path in variables with the correct directories of the requirements.

Windows

cmake -B build_dir -DCMAKE_PREFIX_PATH=/path/to/Qt/version -G "MinGW Makefiles"

MacOS

cmake -B build_dir -DCMAKE_PREFIX_PATH=/path/to/Qt/version/macos -DLIBSSH_INCLUDE_DIR=/libssh/dir/include -DSPARKLE_INCLUDE_DIR=/usr/local/Caskroom/sparkle/1.27.1/Sparkle.framework/Versions/Current/Headers

Linux

Make sure you have all the requirements installed with you own package manager

cmake -B build_dir -DCMAKE_PREFIX_PATH=/path/to/Qt/version/gcc_64

Step 2

Then you can build with

cmake --build build_dir --config Release --target caesium_image_compressor

Languages and translations

The 1.0 version of Caesium had a lot of community made translations, but this 2.0 release has a whole new set of strings and no old translations can be used anymore. Caesium 2.0 is currently available in:

Language	Progress
ar_EG	77%
de_DE	72%
el_GR	69%
en_US	100%
es_ES	67%
fa_IR	98%
fi_FI	72%
fr_FR	68%
hi_IN	72%
id_ID	69%
it_IT	100%
ja_JP	97%
pl_PL	69%
pt_BR	95%
ru_RU	97%
sk_SK	68%
tr_TR	97%
zh_CN	100%
zh_TW	100%

How to contribute with your translation

You can help translate by opening the resources/i18n/caesium_en_US.ts with QtLinguist or any XML editor. Rename it to your language (e.g. caesium_it_IT.ts) and translate all the sentences. Then you can start a pull request with your translated file. See this pull request as an example. Thanks to all the people who contributed.