Free Canthal Tilt Test
Measure the visible angle between the inner and outer corners of each eye, with a clear explanation of what it means.
A little curiosity starts here.
Drop a photo here, or choose one from your device.
JPG, PNG or WebP · up to 10 MB · one face
Your photo stays in your browser. No account. No upload. No payment.
How we handle privacy · How we calculate results
Positive, level or negative?
The outer corner appearing higher than the inner corner produces a positive angle; lower produces a negative angle. We compensate for face roll using a forehead-to-chin axis. Results refer to image left and image right, so they remain understandable even if your photo is mirrored.
A photo estimate, not an anatomical exam
Eyelid position, expression, glasses and head rotation influence the landmarks. This tool estimates angles from a flat photo. It cannot diagnose eye conditions or establish whether you need a treatment.