QRix
Hit exactly 1024×1024 — the large square used for app icons and AI image workflows.
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1024×1024 has become the default large square: it is the master size Apple asks for when submitting an app icon, the native output of many image-generation models, and a comfortable source for any tile that has to stay sharp on a high-DPI screen. Being a power of two also makes it well behaved as a texture in graphics pipelines. As a source file it is genuinely useful — you can scale it down to 512, 256 or 128 cleanly, whereas going the other way never works as well. Fill crops a rectangular photo to a centred square; fit preserves an entire logo or icon artwork against a background colour you choose, which is usually the right call for anything with fine edges.
It is the master size app stores request, from which every smaller icon size is generated. Supplying it at full resolution keeps all the derived sizes crisp.
It is the native output of many image models, so working at that size avoids an extra resampling step that can soften detail.
Yes, and cleanly — it divides evenly into 512, 256, 128 and 64, which is part of why the size is so widely used.
Fit. It keeps the entire logo visible and pads the remaining space, so no part of the mark is ever clipped.
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.