Image
compression
to the
max!
This is the image compressor for professionals, specifically designed for tasks where you have to squeeze out the last byte of your images. But you can use it of course for all your images. It's free to use.
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.
News
A small but nice update at Compress-Or-Die. compress-or-die.com/analyze now shows the estimated quality for all quantization tables contained in a JPEG. To improve the privacy for all of us, I now also use Matomo instead of Google Analytics and have completely removed Addthis.
I still occasionally see people passing around the "save your png with transparency to prevent jpeg conversion" trick, which no longer works since twitter changed its png compression rules earlier this year :/
Does image optimization matter? Of course it does. A study on impact of image optimization on performance. blog.uploadcare.com/image-optimiza…
I've added the new field "Estimated JPEG Quality" to the Examine tool of compress-or-die.com . This way you get an estimate of the value with which the JPEG was saved. The estimate is based on a classification of quality values generated by the standard quantization tables.
Here's a visual aid in how PNG will work on Twitter starting February 11th - PNG will be converted to JPEG 85% quality and tested: Twitter keeps smaller of the PNG and JPEG - PNGs less than 900 pixels in the longest dimension will be kept - PNG8 images will be kept
