JPEGmini – JPG on a diet

JPEGmini is a patent-pending photo recompression technology, which significantly reduces the size of photographs without affecting their perceptual quality. It can reduce the size of photos up to five times while maintaining its quality and resolution.

JPEGmini – JPG on a diet

The JPEGmini algorithm imitates the perceptual qualities of the human visual system, ensuring that each photo is compressed to the maximum extent possible by removing redundancies, without creating any visual artifacts in the process. This enables fully automatic, maximal compression of photos with no human intervention required. JPEGmini developers promise, in some cases, reduce weight photography up to 80% without loss of quality and metadata.

JPEGmini technology has two main components:

  • Image quality detector – which imitates the perceptual qualities of the human visual system, to determine the maximum amount of compression which can be applied to each individual photo without causing visible artifacts.
  • JPEG encoder – which adapts the JPEG encoding process to the original photos, creating the most compact representation of the photos that is possible under the JPEG standard.

JPEGmini is currently available as an online service here ( Using this type of compression can give better results than using the expensive Photoshop CS.

p.s. It could be response for Google WebP which is a new image format (first announced in 2010) that provides lossy compression for photographic images. WebP images were ~39.8% smaller than jpeg images of similar quality.

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This article was first published September 8th, 2011