Image Resizer

Yes, reducing pixel dimensions significantly reduces file size. A 4000x3000 image resized to 1200x900 typically drops to 10-25% of the original size, depending on compression settings.

Resizing changes the display dimensions (can be done via CSS without changing the file). Resampling actually changes pixel dimensions by interpolating new pixel values. This tool does resampling — creating a new file with different pixel counts.

Downscaling (making smaller) always looks good because pixels are averaged. Upscaling (making larger) interpolates new pixels and may look blurry. For upscaling, use bicubic or Lanczos resampling for best results. Never upscale more than 2x.

Instagram: 1080x1080 (square), 1080x1350 (portrait). Twitter/X: 1200x675. Facebook: 1200x630. LinkedIn: 1200x627. YouTube thumbnail: 1280x720.

Browser-based resizing via Canvas API strips most EXIF metadata including camera info and GPS coordinates. This can be a privacy benefit if you're sharing photos online.