EDIT
☞ runs entirely in your browser — nothing is uploadedDrop your image here
or click to browse — PNG, JPG, WebP or GIF
Preview
OneImageTool
Free Image Tools
EDIT
A real circle with a transparent outside — ready for an avatar, a logo or a slide.
or click to browse — PNG, JPG, WebP or GIF
Preview
square first, then round
Rounding the corners of a rectangle by half its short side gives a capsule, not a circle — the straight section in the middle never goes away. So this tool squares the image first, taking the largest centred square it can, and only then cuts the circle. That is the step most people miss when they try to do it by hand in an editor.
The area outside the circle has to be genuinely empty, not white. A white square behind a circular logo looks fine on a white slide and terrible everywhere else, and it is the single most common way a circular avatar ends up with a visible box around it. Here the export is PNG with real transparency; JPEG stays available but asks you which colour to fill with, since the format simply cannot hold an empty pixel.
three steps
PNG, JPG, WebP or GIF. It is decoded in the page and never uploaded.
The largest centred square is taken automatically and cut to a circle. Add a border in the panel to get a ring around it if you want one.
PNG keeps everything outside the circle transparent, so it drops onto any background cleanly.
quick answers
The largest square that fits, taken from the centre. A wide photo loses equal strips from the left and right; a tall one loses the top and bottom. If the subject is off-centre, crop it square first with the crop tool, then bring it here.
In PNG and WebP, yes. In JPEG it cannot be — the format has no alpha channel — so you choose a background colour and the corners are filled with it instead.
Yes. Raise the border percentage and the border follows the circle, giving you a ring in the colour you pick. It is drawn outside the image, so nothing is covered up.
That is the main use. Most platforms mask avatars into a circle anyway, so cropping it yourself lets you see exactly what will be cut instead of finding out after uploading.
Usually a little: the corners become transparent and compress well in PNG. But a PNG of a photo is still larger than the equivalent JPEG, so if size matters more than transparency, JPEG with a matching background colour is the better pick.
No. The squaring, the circular cut and the export all happen in your browser. The file never leaves your device.