Image Resizer

Resize by exact pixels, percentage, or preset widths — with high-quality downscaling. Everything runs in your browser; nothing is uploaded.

Resizing uses createImageBitmap's high-quality scaler when your browser supports it, and falls back to stepped canvas halving for large downscales. Nothing leaves your device.

Downscaling in one giant step causes jagged artifacts, so this tool halves the image repeatedly before the final pass. See also the Image Compressor and Image to Base64.