Unraveling The JPEG
A deep, deep, deep dive into the JPEG format. Best of all, it’s got interactive explanations you can tinker with, a la Nicky Case or Bret Victor.
Tags: compression
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Squoosh
A handy in-browser image compression tool. Drag, drop, tweak, and export.
Href Tools - Free online web tools
Handy web-based tools—compress HTML, CSS, and JavaScript, and convert files from one format to another.
Essential Image Optimization
Following on from Amber’s introduction, here’s a really in-depth look at image formats, compression and optimisation techniques from Addy.
This is a really nicely put together little web book released under a Creative Commons licence.
google/guetzli: Perceptual JPEG encoder
Google have released this encoder for JPEGs which promises 20-30% smaller file sizes without any perceptible loss of quality.
The Long, Remarkable History of the GIF
The history of the GIF—a tale of licensing, compression, and standards.
Sensible jumps in responsive image file sizes
Some good thinking from Jason here. In a roundabout way, he’s saying that when it comes to responsive images—as with just about every other aspect of web development—the answer is …it depends.
Retina revolution
You’ve probably seen this already, but it’s really worth bearing in mind: when you’re scaling up JPGs for retina display you can safely reduce the image quality by quite a lot—to the point of getting the exact same file size as a higher quality image that’s half the size.
JPEGmini - Your Photos on a Diet!
This looks like a really handy tool for reducing the file size of JPEGs without any perceptible loss of quality (in much the same way that ImageOptim works for PNGs)—available as a Mac app or an installable web service.
HTTP Compression use by Alexa Top 1000 | Zoompf
An in-depth analysis (graphs! data!) of how popular sites are using—or not using—compression.