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How to Resize Images for a Website

A practical image resizing checklist for faster pages, sharper thumbnails, better Core Web Vitals, and cleaner responsive layouts.

2026-05-24 - 6 min read

Resize to the real display size

A large camera photo is often far bigger than a web page needs. If a card displays at 600 pixels wide, uploading a 4000 pixel image wastes bandwidth and slows the page.

Prepare separate sizes for hero images, thumbnails, blog cards, and product galleries. This keeps pages fast without making images look soft.

Keep aspect ratios consistent

Consistent aspect ratios prevent layout jumps and make grids feel cleaner. Pick a ratio such as 1:1, 4:3, or 16:9 for repeated content.

After resizing, compress the image and prefer WebP for modern websites. This combination usually helps both page speed and visual quality.

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