Personally I’ve never needed to compress a large number of images before, but if I did I’d definitely be using Caesium. The interface is easy to understand, and the dual-pane previews along the right side make it easy to see the before/after comparison so that you can get the right compression ratio.
As you can see in the screenshot above the compression ratio turned out to be pretty good for the sample images I was working with. However, I had the compression quality set to 80% which may be lower that some of you may want to go. Even at 100% quality I did see the file size drop 25% lower than it started, which is still good.
Here’s a rundown on some of the features:
- Portable version requires no installation
- Resize your pictures up to 90% preserving the file format
- Batch processing
- Quick zoomable preview of the output
- Picture-by-picture compression level
- Compression level can be set with an easy slider
- Metatag information support
- Drag and drop pictures directly into the list
- Rename all files with a custom suffix
Caesium Homepage (Windows only; Freeware; Portable)