Image Compression Guides
Everything you need to know about image formats, compression techniques, and web performance.
These guides are written for people who actually have to make images smaller and aren't sure where to start. Some are technical — how JPEG and WebP encoders decide what to throw away, why MozJPEG squeezes out extra savings — and some are practical: what size your product photos should be on Shopify, how to stop hitting email attachment limits, which format to reach for when.
Every guide is hand-written, not generated, and the file-size numbers in the worked examples come from running real images through the same MozJPEG and WebP encoders that power the compressor on this site. If you're a developer chasing better Core Web Vitals, a blogger who wants posts that load fast on mobile, or someone preparing photos for a store or a newsletter, start with whichever title matches your problem. They cross-link, so you can follow the thread from "which format" to "why" to "what settings" without backtracking.
JPEG vs PNG vs WebP: Which Format Should You Use?
Understanding the strengths and trade-offs of the three most common image formats on the web.
5 min read
How Image Compression Works (Without Losing Quality)
A plain-language explanation of what happens when you compress an image, and why smaller doesn't always mean worse.
6 min read
Best Image Sizes for Web Performance in 2026
Practical guidelines for image dimensions, file sizes, and responsive delivery that keep your site fast.
5 min read
How to Reduce Image File Size for Email
Email clients are picky about images. Learn the best sizes, formats, and compression settings for email that actually work.
4 min read
MozJPEG vs Standard JPEG: What's the Difference?
MozJPEG produces smaller JPEG files with no quality loss. Here's how it works and why you should be using it.
5 min read
Image Compression for E-Commerce: Faster Stores Sell More
How product image weight affects conversions, the right sizes for Shopify, WooCommerce, and Etsy, and how to compress without making your products look worse.
7 min read
How to Prepare Images for Social Media (Sizes & Formats by Platform)
The right dimensions, file-size limits, and formats for Instagram, X, Facebook, and LinkedIn — so your images stay sharp instead of getting crushed by the platform.
6 min read
Image Compression FAQ: 15 Common Questions, Answered
Short, direct answers to the questions people actually ask about compressing images — quality loss, formats, transparency, EXIF data, and more.
6 min read
How to Optimize Images for WordPress (Speed, Plugins & Core Web Vitals)
A practical workflow for compressing images on WordPress — what to do before upload, when a plugin helps, and how images affect your Core Web Vitals.
7 min read
AVIF vs WebP: Which Next-Gen Format Should You Use?
AVIF compresses smaller than WebP, but it isn't always the right choice. Here's how the two modern formats compare on size, quality, support, and speed.
7 min read