What Is Image Compression? A Plain-English Guide for Everyone

Published June 4, 2026 · 5 min read read

Understand what image compression actually does, how quality and file size relate, the difference between lossy and lossless, and when to use each — with real before/after examples.

Welcome to this detailed guide on What Is Image Compression? A Plain-English Guide for Everyone provided by Run It Free. In this article, we explain the key concepts, formulas, practical applications, and step-by-step methods to get the best results.

Key Takeaways

  • Understand the underlying calculations and practical benefits.
  • Learn how to optimize your results using free browser-based tools.
  • Follow simple, step-by-step instructions for maximum privacy and security.