QRix
Change the dimensions of your image to exact pixel sizes, with optional aspect-ratio lock.
Result will appear here
Resizing is useful for fitting images into specific places: social media posts, thumbnails, avatars or print layouts. Keep 'Lock aspect ratio' on to avoid stretching — changing width updates height automatically. You can also choose the output format. All processing happens in your browser; your image never leaves your device.
It's free, private and works right in your browser — no signup, no watermark.