1. Optimizilla is an online image optimizer uses a smart combination of best optimization and lossy compression algorithms in order to shrink JPEG and PNG pictures to the minimum possible size while keeping the required level of quality.

  2. Kraken is a robust, ultra-fast image optimizer. Thanks to its vast array of optimization algorithms Kraken is a world ahead of other tools. Want to save bandwidth and improve your website's load times? Look no further and welcome to Kraken!

  3. Make your website faster and save bandwidth. TinyPNG optimizes your PNG images by 50-80% while preserving full transparency!

  4. Optimize and compress your images online. Compressor is a lossy and lossless photo compression tool.

  5. JPEGmini - The Photo Optimization Tool Trusted by Tens of Thousands Image Perfectionists

  6. -Combines PNGOUT, OptiPNG, and DeflOpt to create the smallest PNGs