Resize an image to 300x300 for a small square thumbnail

Where a 300x300 square fits

300x300 is a 1:1 square and a common pick for small profile avatars, catalog thumbnails, and some online exam or application photos. It is small enough to load fast in a list yet still readable.

Because it is compact, it is a frequent default when a site caps avatar or thumbnail dimensions. The resize tool is pre-filled at 300 by 300, so you drop a photo in and export.

Crop to a square before you shrink

Most source photos are taller or wider than they are square, so forcing a 4:3 or portrait shot into 1:1 stretches it. Crop the photo to a square first, then resize to 300x300 for a clean fit.

Keep the face or the product in the center of that square crop. At 300 pixels there is little room to spare, so a centered subject reads far better than one pushed to an edge.

Keep the file tiny

A 300x300 image is already light, but exam portals and listing sites often set a strict size cap. You can compress the result to slip under the limit without changing the dimensions.

Everything runs on your own machine. The photo is processed in the browser and never uploaded, so a personal ID shot stays private.