Resize an image to 512x512 for an app icon or avatar

Why 512x512 keeps showing up

512x512 is a 1:1 square and a power of two, which is why it is asked for so often. App icons, Discord and Steam avatars, favicon source files, and many machine learning model inputs all use this exact size.

A power-of-two square scales down cleanly to smaller icon sizes like 256 and 128 without odd artifacts. The resize tool is pre-set to 512 by 512.

Start from a square crop

An icon or avatar source is rarely square out of the camera, so squeezing a non-square image into 512x512 distorts it. Crop the artwork to 1:1 first, then resize so the shape stays true.

For an icon, keep the key mark centered with a little padding, since rounded icon masks clip the corners on many platforms. A centered design survives every mask shape.

Convert to a smaller, sharp file

Icons and avatars often need a small file with crisp edges. After resizing, convert it to WebP for a smaller file that holds detail well at this size.

Resizing runs in your browser on your device. Unreleased app art or a brand asset never gets uploaded to a server.

Keep the alpha channel if your icon has one

App icons and logos often rely on transparent corners so the platform can apply its own rounded mask. Resizing preserves that transparency, but converting to JPG destroys it, because JPG has no alpha channel and fills every transparent pixel with a solid colour.

If you are not sure whether your source still has transparency, run it through the PNG transparency checker before you export. A flattened white square where a transparent one should be is the sort of thing nobody notices until the icon is live.