ResizeBox

What is ResizeBox?

ResizeBox is a free online tool that lets you resize, convert, and optimize images right in your browser. Just drag and drop your photos, pick the size in pixels, inches, or centimeters, tweak quality and format, and see a live preview before you download. It supports JPG, PNG, GIF, WebP, BMP, and TIFF, and keeps your images private by processing everything locally—no uploads, no accounts, no watermarks. Perfect for web, print, or social media, you can compress files, lock aspect ratios, set custom DPI, and switch formats with ease.

Key features

• Resize images in pixels, inches, centimeters, or millimeters easily.
• Compress and optimize photos for faster loading without quality loss.
• Convert between JPG, PNG, WebP, GIF, BMP, and TIFF formats.
• Preview resized images in real time before downloading your files.
• Maintain aspect ratio and set custom DPI for precise dimensions.
• Process all images locally in your browser to ensure privacy.