Image compression
to the max!

Do you still use Photoshop to export your images? Are you kidding? You may have noticed that this is not the best idea. Neither are the results. Fortunately, you found Compress-Or-Die - lucky you! This ultimate tool compresses your lossless PNGs or high quality JPGs to the smallest filesize possible.

Compress-Or-Die is designed for supporting your creation of banners or ads where you have to squeeze out the last byte. But you can use it of course for all your images. It’s as simple as that, try it now! And best of all, it’s free to use.


The auto-rotation of JPG input files is now lossless.
Added the article "Finally understanding PNG". Learn about PNG compression in simple words and find out how to outwit the PNG compression algorithm to gain more quality at lower file sizes.
Fixed a bug with the HTML code of a transparent JPG that sometimes broke the image if it came from cache. Thanks, Nina.
Added automatic rotation of JPGs based on EXIF meta data.
The JPG selective quality feature now shows the compressed image in its preview area so you will better know where to adjust the brightness quality.
Added the current scaling value to the preview area (next to the headlines "Result" and "Original"). Only visible if you have an image larger than 100% of the viewport.
Added the preprocessing option "Size in %" for JPG and PNG compression.
Fixed the Photoshop JSX script which did not work after a server update.
Added the article "Finally understanding JPG". If you always wanted to know how the JPG compression works under the hood I want to recommend you this article that is reasonable for every level of understanding.
Added the legendary "Selective quality" for JPGs as brought into prominence by Adobe/Macromedia Fireworks.
New GUI with new upload possibilities. New JPG quantization tables.

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JPG compression algorithm?

If you always wanted to know how the JPG 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 JPGs by exploiting the technical functionality of the JPG compression algorithm.

Read the article "Finally understanding JPG"

PNG compression algorithm?

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 JPG" 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.

Read the article "Finally understanding JPG"

That's me

Christoph Erdmann
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Hi! I’m Christoph, working as a programmer/developer for the MINISTRY Group in Hamburg/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.

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