QRix
Hit exactly 500×500 — a light square for thumbnails, listings and upload limits.
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500×500 is the square you use when the file has to be small: forum avatars with strict size caps, product thumbnails in a grid, catalogue tiles, and any form that rejects anything larger. It is a quarter of the pixel count of a 1080px square, so the exported file is dramatically lighter while still looking sharp at the modest sizes it is displayed. As with any square, the crop is the real decision — fill trims the long edge of a rectangular photo to make it 1:1, while fit shrinks the whole thing onto a background colour so nothing is lost. If a system rejects your upload even at 500×500, the problem is file size rather than dimensions, and the quality slider is what fixes that.
For a grid thumbnail it is fine. For a listing where buyers zoom in, use a larger square such as 1080×1080 so detail survives the zoom.
Lower the quality slider. Dimensions stay at 500×500 while the file gets substantially lighter.
No — the aspect ratio is preserved. Fill crops the overflow and fit pads the gap, so the subject never looks stretched.
A JPG with adjustable quality, which is the most widely accepted format for thumbnails and avatars.
No. Resizing runs entirely in your browser with the Canvas API, so the file never leaves your device and nothing is stored or transmitted.
It's free, private and works right in your browser — no signup, no watermark.