Downscaling (making images smaller) is sharp and clean — we use high-quality smoothing for crisp results. Upscaling beyond an image’s original size will look softer, since there’s no extra detail to add; resized images that are upscaled are clearly flagged so you always know.

A PNG stays a PNG, a JPG stays a JPG, and the same goes for WebP, GIF, and AVIF — the resizer never silently changes your format. For GIFs, the first frame is resized (animation is flattened to a single still frame).

These apply when the aspect ratio is unlocked and you’ve set both width and height. **Stretch** fills the exact dimensions and may distort the image. **Contain** fits the whole image inside the box and pads the edges. **Cover** fills the box completely and crops any overflow. With aspect ratio locked, proportions are always preserved and no distortion or cropping occurs.

No. Everything runs locally in your browser using the Canvas API — your images never leave your device, there are no uploads, and nothing is stored. That makes the tool fast, private, and safe for sensitive or confidential images.