Calculator
What the Circle Crop Image does
Circle Crop Image: takes the largest centred square, clips it to a circle and exports a PNG with a transparent (or solid) background, which is what profile pictures, avatars and badges need. Everything runs in your browser and the file is never uploaded.
Pick a file and the Circle Crop Image processes it right here in the page. Processing is local, so speed depends on your machine rather than someone else’s server load.
Typical users are writers preparing assets for a post. Getting the dimensions right before upload avoids a lot of downstream cropping.
Because it is all local, the tool is as fast as your device and as private as your own notes.
Field definitions, the method, and a worked example from the default values are all set out further down the page.
What do the Circle Crop Image fields mean?
The Circle Crop Image uses 4 inputs. Nothing is blank on load, so you can see the shape of the answer before supplying your own figures.
| Field | What to enter | Default |
|---|---|---|
| Image file | stays on your device | none |
| Centre the circle on | choose from Centre, Top or Bottom | Centre |
| Output size | measured in px (0 = keep); accepts 0 to 4096 | 0 |
| Background | choose from Transparent (PNG), White or Black | Transparent (PNG) |
How does the Circle Crop Image work?
Each output is derived from the inputs above in a single pass; there is no hidden state carried between runs, so the same inputs always give the same result.
Bad input produces a message, not a silently incorrect figure.
What a typical run looks like
You provide: Image file, Centre the circle on, Output size and Background
What happens: the file is read into memory by your browser, processed locally, and offered back as a download. It is never uploaded.
You get back: the finished file to download, with a line in the panel saying what was done.
Because the work is local, speed depends on your device rather than our servers, and large files are limited only by available memory.
How to use it
- Choose your file under Image file, or drag it onto the drop area.
- Pick a value for Centre the circle on: the options are Centre, Top or Bottom.
- Set Output size in px (0 = keep) (0 to 4096).
- Pick a value for Background: the options are Transparent (PNG), White or Black.
- Press Crop to Circle.
- Look at Status in the output panel.
- Print gives a tidy version without the navigation, which is handy for attaching to a file.
What this tool does not do
- Re-encoding a lossy format such as JPEG always loses some detail, even at maximum quality.
- EXIF metadata may be dropped during processing, which is usually desirable but is worth knowing.
- Treat it as a fast first pass, not as the final word on a decision that matters.
- Garbage in, garbage out: confirm each figure means what you think it does before trusting the result.
- Because everything runs locally, processing speed depends on your device rather than our servers.
Frequently asked questions
Enter Output size in px (0 = keep). Both the inputs and the result are explicitly labelled, so mixed units cannot slip through unnoticed.
Output size accepts 0 to 4096 px (0 = keep). Anything beyond those bounds is flagged rather than approximated.
No. The file is read by your browser and processed inside the page. It is never sent to us, which is also why it keeps working offline once loaded.
No payment and no login. Advertising covers the running costs.
As accurate as the inputs allow. The arithmetic itself introduces no error beyond display rounding.