optipng

Advanced PNG (Portable Network Graphics) optimizer
  http://optipng.sourceforge.net/
  3
  2 reviews



OptiPNG is a PNG optimizer that recompresses the image files to a smaller size. It losslessly reduces the bit depth, the color type and the color palette of the image, runs a suite of compression methods and strategies, and selects the compression parameters that yield the smallest output file. It also recognizes several external file formats like BMP, GIF, TIFF and PNM (PBM, PGM, PPM).
Latest reviews
5
jahid_0903014 5 years ago

Very useful tool. For JPG see jpegoptim

4
tomasfox 8 years ago

Good for compressing png files without losing quality