Your opinion is so important for me! Do you dream of another fancy feature which would spice up your work routine? Even if you have found a bug, don't hesitate to drop me a line. I will do my best to implement your feedback and improve this tool.

But maybe your question has already been answered in the FAQ. Take a look inside.

I am able to read/answer in German/English.

That's me

Christoph Erdmann

Hi! I’m Christoph, working as a programmer/developer in Bielefeld/Germany.

Since I was building an advertising tool, I had to learn a lot about image file formats and compression.

This tool is some kind of a by-product and turned out to be my sweet little baby. So have fun using it! I hope it will help you as much as it does for me.


Hi all, COD users. Just added in the interface you can change the background of transparent images to better estimate how the image looks on different backgrounds. Also, there is now the ability to sharpen color edges of WebP images, which is close to a JPG 1x1 color subsampling.

2021-11-2203Bielefeld, Germany