Skip to content

Auto optimize images in < 100 lines of code

Sometimes you want to reduce the size of all the images in a directory to fit into a fixed limit. For example, if you have a blog post and some linked images:

        first-image.png (2 MB)
        second-image.png (500 KB)

You might want each image to be

  • As good quality as possible
  • No more than 100 KB per image

This is a classic tradeoff - you want low cost (size) but high quality, so if the image is too big, you want to reduce it to around 100 KB.

The two step process

The nicest way to reduce the file size of PNGs is to