No image data is uploaded. Resizing uses your browser Canvas API. Page assets and fonts still load over the network.
Choose PNG or WebP and a transparent background. JPEG uses a solid background, white by default.
Upscaling adds pixels by interpolation; it cannot recover detail missing from the original. The tool warns when enlarging.
25 MB per input, 16384 pixels per side and 32 megapixels per output. Images slightly above 24 MP are supported. Larger requested outputs show recommended dimensions rather than silently changing your chosen size.
Animated inputs become a still image. Original metadata is not retained. JPEG and WebP quality controls use lossy encoding; PNG quality is not adjustable.