Compress-Or-Die
The most advanced free online compressor used by professionals to reduce the file size of their images to a minimum. Compare it now with any other app.
Articles
The big image compression tool comparison
There are a lot of articles about online image compression tools in the net, most of them are very superficial. Usually they end with a simple: "It generates smaller pictures, so it's got to be better."
Learn why such statements are most of the time meaningless, understand the technical background, and find out which tool you should use as of today.
Finally understanding JPEG
If you always wanted to know how the JPEG compression works under the hood I want to recommend this article to you. It was important to me to write an article that is reasonable for every level of understanding.
Furthermore it contains 7 valuable tricks to reduce the file size of your JPEGs by exploiting the technical functionality of the JPEG compression algorithm.
Finally understanding PNG
Ever wondered why some of your PNGs are of large file size while similar PNGs are so small?
Since this question comes up so often, I have written a follow-up to my article "Understanding JPEG" to explain the bare necessities of the PNG compression algorithm in layman's terms.
At the end you will also get 7 tips on how to get your PNGs to a REALLY small file size.
That's me
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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.
Many thanks to the MINISTRY Group for hosting COD.
Image Compression News
Now I am a little bit proud. ☺️ @nucliweb translated my article "Finally understanding JPG" into Spanish. Thanks a lot, Joan 🤗. Now available in three languages. Someone else interested in additional translations? twitter.com/nucliweb/statu…
A small update, because I just needed it myself. :) compress-or-die.com now supports setting brightness and contrast for JPEG, PNG and WebP formats. Convenient if you just want to prepare scans quickly.
JPEG-XL! Is here!! gitlab.com/wg1/jpeg-xl @jonsneyers gave a good preview of the format and an explanation of the motivations behind it earlier this year at ImageCon — video: youtube.com/watch?v=RYJf7k…; slides: slideshare.net/cloudinarymark…
Starting today, Twitter will preserve JPEGs as they are encoded for upload on Twitter for Web. (Caveat, cannot have EXIF orientation) For example: the attached photo is actually a guetzli encoded JPEG at 97% quality with no chroma subsampling. en.wikipedia.org/wiki/Guetzli
From now on compress-or-die.com/jpg always embeds the unit inch for the resolution, because the unit cm seems to be problematic for some programs (e.g. Outlook and Apple Mail).
