How it works
We draw your image onto a canvas at the new dimensions using the browser's high-quality smoothing, then encode the canvas to your chosen format. There is no upload.
FAQ
Will this make my image blurry? Downscaling (making smaller) generally looks great — we use the browser's high-quality bilinear filter. Upscaling (making larger) cannot recover detail that is not there; expect softness if you scale beyond the source dimensions.
Why does locking the aspect ratio matter? It prevents stretching. With the lock on, changing width also updates height (and vice versa) so your subject keeps its natural proportions. Turn it off if you specifically need to squish or stretch the image.
PNG vs JPEG vs WebP — which should I pick? WebP for general web use (smallest file, near-universal browser support). JPEG for maximum compatibility (email, legacy systems). PNG only when you need lossless or transparency. AVIF when you want the absolute smallest file and your audience has Chrome 85+ or Safari 16+.