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How Image Resizing Differs from Image Compression (and Why Both Matter)

Fundamentals
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Resizing adjusts an image’s pixel dimensions—making large images fit the intended on-screen size. Compression, on the other hand, shrinks the file size through algorithmic optimization without necessarily changing dimensions. Both are essential: resizing prevents oversized files from loading unnecessarily, and compression squeezes out additional bytes by removing redundant or imperceptible data. For best results, resize your images first, then apply compression. This two-step process ensures efficient, speedy, and visually appealing site images.