Free photo measurement
Negative Canthal Tilt — Measure Your Eye Corner Angle
Upload one front-facing photo and see the tilt of each eye's corner line in degrees, corrected for head roll, with the measurement drawn directly on your photo.
In short: Negative canthal tilt means the outer corner of the eye sits lower than the inner corner, so the canthal line slopes downward toward the temple. It is a normal anatomical variation present in a large share of people. Our tool measures the exact angle per eye from a photo — positive, near-level or negative — instead of guessing from a mirror.
By FaceReport Research · Updated October 23, 2026
The measurement
What is negative canthal tilt, exactly?
The term sounds clinical, but the underlying measurement is simple geometry you can see on your own photo.
Draw a line from the inner corner of your eye (next to the nose) to the outer corner (toward the temple). That is the canthal line. When the outer corner sits above the inner one, the tilt is positive; when both corners are level, it is near zero; and when the outer corner drops below the inner one, you have a negative canthal tilt. The measurement is usually expressed in degrees, with most faces falling somewhere between −10° and +10°.
A negative canthal tilt is not a defect, a diagnosis or a sign of anything medical. It is one of the many ordinary ways eye geometry varies between people, and a mild negative canthal tilt is extremely common — and it is also strongly affected by photography: head roll, squinting, fatigue and even a camera held slightly below eye level can exaggerate or soften the measured angle. That is exactly why measuring the actual angle beats eyeballing a selfie: numbers with a stated tolerance, instead of a vibe about your negative canthal tilt.
- ±1°
- display tolerance used to group positive / near-level / negative readings
- 2
- independent measurements — one per eye — plus a roll-corrected average
- 100%
- on-device processing; your photo never leaves the browser
How it works
How the negative canthal tilt test measures your photo
Three honest steps stand between your photo and the angle on your screen.
- 1
Locating the canthal points
An on-device face landmark model finds 478 points on your photo, including the inner and outer corners of both eyes. The analysis canvas shows exactly which points were used — no black box.
- 2
Correcting for head roll
Before computing the angle, the tool estimates how much your head is tilted in the photo and rotates the measurement frame back to level. Without this step, leaning your head a few degrees would fake a negative canthal tilt that isn't there.
- 3
Computing the negative canthal tilt angle
Each eye's corrected corner line becomes a signed angle in degrees. The overlay draws both measurement lines, a dashed horizontal reference, and the angle labels — the same numbers shown in the result cards.
The test refuses to output precision it doesn't have. If the photo shows closed eyes, heavy occlusion, an extreme head turn or multiple faces, you get a clear retake message instead of a confident-looking wrong number. A negative canthal tilt reading is only as good as the photo behind it.
Reading results
Reading your negative canthal tilt results
What the three numbers mean, and what to do with them.
Your per-eye negative canthal tilt angles
Left and right eyes are measured independently because small asymmetries are normal. One eye at −2° and the other at +1° is an ordinary human result, not an error.
The average angle and its negative canthal tilt category
The mean of both eyes decides the label: below −1° counts as a negative canthal tilt, above +1° as positive, and anything between as near-level. The ±1° boundary is a display convention, not a medical threshold.
The annotated, downloadable negative canthal tilt photo
Your overlay — corner lines, reference horizontals, angle wedges — can be downloaded as a PNG. It makes the negative canthal tilt measurement verifiable: anyone can re-trace the lines.
Photo quality
Getting an accurate negative canthal tilt reading
Negative canthal tilt measurements are only as accurate as the photograph. Five habits produce readings you can trust.
- Shoot straight-on: the camera at eye level, face centered, chin neutral.
- Use soft, even light — harsh shadows at the eye corner shift landmark placement.
- Keep eyes open and relaxed; a squint can fake several degrees of tilt and turn a neutral eye into an apparent negative canthal tilt.
- Avoid glasses for this measurement: frames often cover the outer canthal point.
- Leave makeup as-is or none; heavy eyeliner visually extends the corner line but does not move the landmark.
If you test the same face with different photos, expect small variation — a degree here or there — and occasionally a category change near the −1° boundary that separates negative canthal tilt from neutral. That honesty is built in: the tool would rather show you a tolerance than pretend a single selfie is ground truth about your negative canthal tilt.
Context
Why people check negative canthal tilt
The measurement became popular through appearance communities — here is the sober version of that story.
Look-rating and looksmaxxing forums gave negative canthal tilt its fame — the phrase is practically their signature term — often pairing it with harsh labels we deliberately avoid. The geometric fact underneath is neutral: downward-sloping corner lines create one visual impression, upward lines another, and both appear across completely ordinary faces. Makeup tutorials use the same geometry in reverse — a subtle flick of eyeliner visually raises the outer corner without moving a single landmark.
If your test confirms a negative canthal tilt, the useful takeaways are photographic and stylistic, not existential: camera height and eyeliner change the measured appearance of negative canthal tilt, and the related hunter eyes page shows how tilt combines with aperture and brow position in the trait lists those communities use. For measuring the raw angle of a negative canthal tilt, this page is the whole toolkit.
Frequently asked questions about negative canthal tilt
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