Caesium
Caesium Image Compressor is software for compressing pictures while aiming to preserve visible quality.
About Caesium
Caesium Image Compressor compresses digital pictures while aiming to preserve visible quality. It supports processing multiple images at the same time with a real-time preview, along with metadata storing options and folder structure support.
It is available as desktop software for Windows 10 (build 1809) or later and macOS 12 and later, with installer, portable zip, and DMG options. It also provides a command-line tool and an online compressor for use without downloading desktop software.
Key features
- Batch compression of multiple images at the same time
- Real-time preview of compression results
- Metadata storing options
- Folder structure support during processing
- Command-line tool for image compression
- Online compressor without downloading desktop software
Best for: Photographers, bloggers, webmasters, businesses, and casual users storing, sending, and sharing digital pictures.
Good for
- Available for Windows, macOS, and online use
- Processes multiple images at the same time with preview
- Offers installer, portable, and command-line options
Watch out for
- Windows version requires Windows 10 (build 1809) or later
- macOS version requires macOS 12 or later
Caesium at a glance
- Website
- saerasoft.com/caesium
- Category
- Online Tools › Image Tools
- Type
- Online tool
- Pricing
- Not confirmed. Check the site
- Platforms
- macOS, Web, Windows
- Open source
- Not stated
- Language
- English
- Last checked
- Oct 5, 2026 · Online when checked
- Listed
- Oct 5, 2026
Guides for Image Tools
Caesium alternatives
Tools and sites you could use instead, ranked by how closely they match.
Caesium Image Compressor compresses JPG, PNG, WebP, and TIFF pictures for storage, sending, and sharing.
Open source
24 alternativesBulk Image Compressor compresses multiple images online in one batch without uploading files or signing up.
Caesium Command Line Tools compresses images with lossy or lossless options.
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Caesium FAQ
Do I need to download software to compress a few images?
No, Caesium offers an online compressor for compressing images without downloading desktop software.
Which Windows versions are supported?
Windows 10 (build 1809) or later, with installer and portable zip options.
Which macOS versions are supported?
macOS 12 and later, available as a DMG download.
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