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Image Compression vs. Resizing: What's the Difference and When to Use Each?

Fundamentals
image compression explainedimage resizing explainedimage dimensions vs file size
Compression reduces a file’s storage cost by removing unnecessary or imperceptible image data, often through mathematical algorithms. Resizing changes pixel dimensions, adjusting how large an image appears on screen. Both are needed: resizing for layout and device fit, compression for speedy delivery. Best practice: always resize to display dimensions first, then apply appropriate level of compression for optimal speed and clarity.