How to Resize Images (Keep Aspect Ratio)

Quick answer: Scale images to exact pixel dimensions or a percentage while keeping the aspect ratio locked. Open 图片尺寸调整 — everything runs locally in your browser, and files never leave your device.

Steps

1. Upload images to the Image Resize tool.
2. Enter a target width or height — the other dimension follows automatically.
3. Download the resized images.

Important notes

• Shrink, do not enlarge: upscaling interpolates pixels and always softens detail.
• For web use, match your content column width (usually 1200px or less); export a 2x version for retina screens if needed.
• Resize from the original each time — repeated re-saving compounds quality loss.

Common questions

Can I resize in bulk? Yes, upload multiple images and apply the same dimensions.

How do I change the aspect ratio? Unlock the ratio lock, but expect distortion — cropping is usually the better answer.