CLI
Caesium Command Line Tools compresses images with lossy or lossless options.
About CLI
CLI is Caesium Command Line Tools (caesiumclt), a command-line tool for image compression. It offers quality-based lossy compression, lossless compression, and compression aimed at a specific maximum file size.
It can resize images, convert between JPEG, PNG and WebP, and compress directories recursively while preserving folder structure, timestamps and EXIF metadata. It runs on Windows, macOS and Linux, and GIF files support lossy compression only.
Key features
- Lossy compression with quality setting
- Lossless compression for JPEG, PNG, WebP
- Target specific maximum file size
- Convert between JPEG, PNG, WebP
- Resize by width, height, long edge or short edge
- Recursive directory compression with structure preservation
Best for: Users comfortable with the command line who need batch image compression, resizing or format conversion on Windows, macOS or Linux.
Good for
- Runs on Windows, macOS and Linux with install options via Cargo, Homebrew and Winget
- Supports batch work including recursive folders, dry runs and overwrite policies
- Preserves EXIF metadata, file timestamps and folder structure when selected
Watch out for
- GIF files support lossy compression but not lossless compression
CLI at a glance
- Category
- Online Tools › Image Tools
- Type
- Open-source project
- Pricing
- Not confirmed. Check the site
- Platforms
- Linux, macOS, Windows
- Open source
- Not stated
- Language
- English
- Last checked
- Oct 6, 2026 · Online when checked
- Listed
- Oct 5, 2026
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CLI FAQ
Which image formats are supported?
JPEG, PNG and WebP support lossy and lossless compression; GIF supports lossy compression only.
Which operating systems can run the tool?
Windows (x86_64), macOS (x86_64/aarch64) and Linux (x86_64/aarch64).
How is it installed?
Download binaries from the release page, or use cargo install caesiumclt, brew install caesiumclt, or winget install SaeraSoft.CaesiumCLT.
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