Canthal tilt

This free eye-angle tool measures canthal tilt from a front-facing photo. It draws a line from each inner eye corner to the outer corner, reports the two angles in degrees and shows their average. A positive value means the outer corners sit higher in the leveled face frame. Everything runs in your browser, so the photo is not sent to our server for this measurement.

Inner and outer eye corners

Canthal tilt is the direction of the line from an inner eye corner to its outer partner. It belongs to each eye separately, so opposite directions can coexist on one face. Eyelid folds, brow position and eye depth can alter the overall look of the area without changing the four corner points used by this measurement. A left-right difference may also appear when the photo is turned or one corner is detected poorly.

Calculating left and right angles

The angle is computed separately for each eye after the face frame is leveled from the forehead-to-chin axis. Outer corners above inner corners produce positive degrees; lower outer corners produce negative degrees. The average summarizes both sides but can hide a meaningful left-right difference. The displayed lines identify the actual corner points, which matter more than a rounded angle alone.

Reading degrees and their signs

The label follows the average: at least +4° is upturned, −1° or below is downturned, and values between those limits are neutral. Thus a slightly negative average such as −0.5° is still neutral. These are software display cutoffs, not clinical or beauty categories. Because canthal tilt can differ between eyes, the separate left and right angles are more useful than a label near a cutoff.

As a hypothetical reading, imagine the left eye at +5° and the right at −2°. Their average is +1.5°, yet the individual lines point in opposite directions. The average would receive a neutral label despite one line slanting upward and the other downward. In this canthal tilt example, the per-eye results reveal information that the average conceals. If a lash or shadow obscures one corner, verify that endpoint before explaining the difference as anatomy.

When checking the left and right canthal tilt lines, remember that “left” and “right” refer to the person in the picture rather than the viewer. In a selfie preview that is mirrored, the two sides may appear swapped even though the underlying angle calculation is unchanged. Compare the line from inner to outer corner on each displayed eye. If the four endpoints look correct but the two canthal tilt readings differ, report that asymmetry as an observation of this image instead of forcing both into the average label.

Eye-corner visibility in photos

Corner detection can move when the eyelid edge is hidden by lashes, hair, makeup or heavy shadow. A slight head turn changes the projected eye shape even when the roll correction keeps the face upright. Look straight into the camera with both corner areas unobstructed. At small image sizes, a one-pixel corner shift can noticeably alter the reported degrees. For eye-corner visibility beyond this note, read how to take a photo for a PSL rating.

Why degrees cannot diagnose eyelid position

This is a two-dimensional photo angle, so it cannot reveal orbital bone position or diagnose an eye condition. The page does not recommend procedures to change eye shape. A negative angle is one ordinary variation, not a verdict about your face. If you want a broader picture of the eye area, compare eye spacing and lid shape alongside this angle. Canthal tilt alone cannot describe the whole eye area.

Zero degrees means a level inner-to-outer line in the leveled image; positive and negative values simply indicate direction. The software uses cutoffs to label an eye upturned, neutral or downturned, but it does not apply a separate normal canthal tilt range by sex. If makeup or glasses hide a corner, removing that obstruction improves the reading. Styling can change the visual emphasis around canthal tilt without changing the measured corner positions.

When an eye-shape label adds information

The eye type page combines this corner angle with eye opening and spacing. If you have been asking “what are hunter eyes?”, that test also uses brow distance and eye spacing in an informal composite label. Neither page changes the canthal tilt calculation; they only put its result in a different context.

Canthal tilt FAQ

What is negative canthal tilt?

It means the outer corner appears lower than the inner corner after leveling the face. A small value is sensitive to the photo.

What is positive canthal tilt?

It means the outer corner appears higher. The angle is measured separately for both eyes.

Is a neutral tilt bad?

No. The label is descriptive and does not decide how attractive someone looks.

Can smiling change the measurement?

Yes. A smile and squint may shift the visible corners, so use a relaxed expression.

Are left and right angles normally identical?

No. Natural asymmetry and landmark noise can make the readings differ.

Is this eye angle medical advice?

No. It is an informational photo measurement, not a diagnosis.

Why does my canthal tilt look different in selfies and AI answers?

Lens distortion, head pitch and landmark error all move the corner line. A phone held low or close stretches the face, a slight nod up or down shifts the outer corner against the inner one, and an eyelid fold or glasses frame can hide the true corner. People and chat assistants judging canthal tilt by eye can disagree even on the direction for the same photo. This tool marks the corner points it used, so you can check each endpoint and retake the photo at eye level without glasses.