Caesium Image Compressor
Free open-source desktop app for batch-compressing JPEG, PNG, WebP and TIFF images with a live preview.
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About Caesium Image Compressor
Caesium is a desktop image compressor aimed at photographers, bloggers and anyone with folders of pictures to shrink. You add images or whole folders, choose lossy or lossless compression and optional resizing, and a real-time preview shows how the result will look before you commit. It handles JPG, PNG, WebP and TIFF, can keep or strip metadata, and can preserve the original folder structure in the output, which makes it handy for large batches. The developer claims size reductions of up to 90% without visible quality loss. Caesium is free and open source under the GPL v3, with installers and a portable build for Windows 10 and later and a DMG for macOS 12 and later. The same compression engine is also available as a command-line tool and through a free online compressor. Its interface is plainer than paid Mac apps, but for free batch work it is a strong option.
Best for: People who need to batch-compress folders of photos for free on Windows or Mac.
Pros and cons
What works
- Free and open source with no file limits
- Batch processing of whole folders with structure preserved
- Real-time preview before compressing
Why people leave
- No official Linux build on the download page
- Interface is functional rather than polished
Top Caesium Image Compressor alternatives
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ImageOptim66.5A free Mac app that runs several optimisers per file and strips metadata automatically.
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Caesium Image Compressor: common questions
Is Caesium Image Compressor free?
Yes. Caesium Image Compressor is free, open-source software.
Is Caesium Image Compressor open source?
Yes. The source code is on GitHub at Lymphatus/caesium-image-compressor.
What platforms does Caesium Image Compressor run on?
Caesium Image Compressor is available for Windows, macOS and Web.
What are the best alternatives to Caesium Image Compressor?
The highest-ranked Caesium Image Compressor alternatives right now are ImageOptim. See the full ranked list for pricing, platforms and verified facts.