Resize JPG, PNG, and WebP images without uploading them.
Image Resizer creates a new copy at your chosen width and height. Smaller dimensions are useful for websites, email, and storage; larger dimensions add pixels but cannot restore detail missing from the original.
Pixel dimensions are best for a precise requirement such as 1200 × 800. Percentage scaling is faster when you simply need half size, double size, or another proportional change.
The aspect ratio lock is on by default. It keeps width and height in sync to prevent stretching. Unlock it only when a specific non-proportional size is intentional.
Compact output for photos. Transparent areas become white.
Lossless output that preserves supported transparency.
Efficient quality-controlled output with transparency support.
No. Resizing happens locally in your browser, so the selected image never leaves your device.
Use pixels when you need an exact width and height. Use percentage when you want a quick proportional scale, such as half size at 50%.
It keeps the original width-to-height relationship. Changing one dimension automatically updates the other so the image does not look stretched.
PNG and WebP output can preserve transparent areas. JPG does not support transparency, so transparent areas are placed on a white background.
Extremely large canvases can exhaust browser memory or fail differently across devices. ToolNest limits output to 16,384 pixels per side and 64 megapixels.