Caesium: free local batch image compression for PC

Jan 1, 2026·ONE PIECE!·Read in Chinese
Caesium Image Compressor is a desktop program made specifically for slimming down images.
It makes large images smaller while keeping them as sharp as possible, which makes it very handy for saving storage space.
  1. It is completely open source and free.
  2. There are no ads at all.
  3. It does not need an internet connection to compress images.
  4. You can shrink hundreds of images in one go.
  5. The program runs entirely on your own computer and never leaks your images.
How to use it
  1. Open the program and drag the images you want to shrink straight into its window.
  2. Set where the new images should be saved at the bottom of the window.
  3. Adjust the quality setting; usually the default of 80 percent is fine.
  4. Click the compress button at the bottom right.
  5. Wait for the progress bar to finish, then find the smaller images in the folder you chose.

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Download page:
https://github.com/Lymphatus/caesium-image-compressor/releases

Out of 10, full marks — it is genuinely useful

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