Image Resizer
Resize images to exact pixel dimensions in your browser, with optional aspect-ratio lock.
Knowledge Base & Educational Companion: Resizing images the right way
Resizing changes an image's pixel dimensions. Serving images at the size they're displayed avoids wasted bytes and keeps layouts crisp on every screen.
1. Downscaling vs upscaling
Reducing dimensions (downscaling) is safe and keeps images sharp. Enlarging (upscaling) stretches existing pixels and softens detail — start from the largest original you have.
2. Keep the aspect ratio
Locking width to height prevents stretching and distortion. Unlock it only when you deliberately need a specific non-proportional size.
3. Right-size for the web
Match image dimensions to their display size instead of shipping huge originals — the single biggest win for page-load speed.
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