Use the most advanced image compressors for free

Trusted by professionals around the globe to compress their images to a minimum. Compare these tools with any other app.

JPEGCompressor

Converts your lossless PNGs or high quality JPEGs into lossy JPEGs with the smallest filesize possible.

Compress your image

JPEG XLCompressor

Converts your image files into the next-generation image format JPEG XL with the smallest filesize possible.

Compress your image

PNGCompressor

Converts your lossless PNGs or high quality JPEGs into lossy PNGs with the smallest filesize possible.

Compress your image

GIFCompressor

Converts your GIFs into lossy GIFs with the smallest filesize possible.

Compress your image

WEBPCompressor

Converts your lossless PNGs or high quality JPEGs into lossy WebPs with the smallest filesize possible.

Compress your image

SVGCompressor

Converts your SVG vector files into SVGs with the smallest filesize possible.

Compress your image

Analyzeyour image

Gives you a lot of information found in the given image (JPEG, PNG, WebP, GIF and SVG).

Analyze your image

Repairyour image

Repairs and fixes your corrupted and broken PNG images.

Repair your image

Made in Germany
EU GDPR compliant

What professionals are saying …

I've been building conservation-oriented websites for over ten years. The difference between this site and all the others I had used is incredible! The bars allow me to fine-tune compression levels and work to find the perfect compression level before hitting that download button. And the quality is incredible!
Jon Hakim, Web Developer at wildcolumbia.org

Whenever you need to crush your file down, especially PNGs I am using compress-or-die. It is very useful when you have to fulfill strict file-size requirements.
Elmar Kirschner, Team Lead Digital Campaigns at .NFQ | Digital Creatives

As a luxury brand, high-quality images are a must in our communications. Nevertheless, low loading time is one of the biggest factors for good UX. That's why we've been using compress or die since the beginning of the year to guarantee both.
Tilman Werthschulte, Online Marketing Manager at DEDON GmbH, Luxury Outdoor Furniture

Absolutely amazing compression. Never before have I had so much control over the compression and had such great compression results. Cannot but recommend.
Kevin, irritable bowel syndrome coach at AnatomyFix

Christoph's image compression tool is just brilliant. I have been using it for many years to reduce the filesize of my web graphics and photos. His knowledge about image compression is absolutely stunning. If you thought your image size is already small give compress-or-die a try. You will be impressed.
Timo "Ostrich" Strauß, Creative Online Marketer at dreieck.com

COD helps compress hero banner images on our website and blog posts. The size reduction function helps us keep quality image resolution and reduce page loading times, thereby improving UX on our website.
Esther, Director at Exodus Beauty

We build HTML5 banner paid media campaigns for video game and movie releases. We use Compress-Or-Die for all of our Jpg compression because the output is the best. Period. Lower file size without lower image quality helps us create better ads.
David, owner of digital production company Department 5

CoD is one of my favorite production tools! The granular controls found in »expert mode« are critical for getting that perfect balance of quality and file size. Thank you SO much, Christoph!
Tom Miller, owner of digital production company Creative Ocean, Inc.

VideoJPEG quality in a nutshell

Ben from Compress-Or-Die explains the two quality sliders in the JPEG compressor, their meaning, and how the human eye perceives brightness and color information differently.

He also discusses the quantization table, which determines how much an image is compressed, and how the formula used to calculate the table can differ between programs or online services.

6 min view

View video

ArticleThe nasty red JPG compression artifacts

During an exchange with an illustrator about another article, he asked me why the JPEG format is so bad at handling the color red. As an explanation, I have already run across several variants. So I simply answered the questions with the variant that seemed most plausible to me.

But was that really the right answer? And if we knew the right answer.... then can't we do something about it?

15 min read

Read article

ArticleBetter image quality in your Twitter tweets

Every now and then I come across tweets where users are upset about the lousy quality of their posted images after Twitter compresses them and doesn't speak well of Twitter.

But is the quality really that bad? Does Twitter really not care about image quality? Is Twitter trying to save storage space on its servers at all costs? Or are the users themselves to blame and have already uploaded their images in poor quality?

I took a closer look at what Twitter actually does with your images in the tweets.

18 min read

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ArticleThe 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.

18 min read

Read article

ArticleFinally 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.

22 min read

Read article

ArticleFinally 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.

15 min read

Read article

That's me

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.

Thank you very much!

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News

Check out our Reddit channel if you want to comment on the news.

Wow! Google researchers have now proposed a new method that combines a standard autoencoder with a diffusion process to recover and add fine details discarded by the autoencoder. Interesting to see the possibilities AI opens up when compressing images.

MarkTechPost

How Should We Store AI Images? Google Researchers Propose an Image Compression Method Using Score-based Generative Models - MarkTechPost

A year ago, generating realistic images with AI was a dream. We were impressed by seeing generated faces that resemble real ones, despite the majority of outputs having three eyes, two noses, etc. However, things changed quite rapidly with the release of diffusion models. Nowadays, it is difficult to distinguish an AI-generated image from a […]

For about a week, there have been stability issues that have caused COD to be temporarily unavailable. I will continue to monitor and analyze the problem.

Perhaps you have noticed. The site was down for a day. What passed me by was that Twitter ended free access to the API, and without mail announcement stopped all apps that didn't subscribe to the Basic account for $100 USD. 😡 So I had to rebuild the news system without Twitter at short notice.

Now everything should be up and running again and I can get back to cool new features.

Not quite sure if the settings options in Compress-Or-Die are really well understood. 🤔 That's why I created a video explaining the two quality sliders in the JPEG Compressor as a test. I am curious about your feedback.

YouTube

JPEG Quality in a nutshell - YouTube

Ben from Compress-Or-Die explains why there are two quality sliders in the JPEG compressor and what they mean. He discusses how the human eye perceives brigh...

Just a little update. Firstly, I have started a Reddit channel and would like to try out with you whether we can get a lively exchange there. I would be happy.

On the other hand, a lot has happened under the hood of Compress-Or-Die, which should provide minimally better results here and there. For example, it is now possible to convert a JPEG lossless into a JPEG XL (thanks to Ted for the idea). Also all used binaries like mozjpeg, cjxl, svgo and others have been updated.

Happy compressing.

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