FaceSymAI

How symmetrical is your face?

Upload one photo. The model places 68 landmarks, measures seven feature pairs against your midline, and gives you a number.

  • Free
  • No account
  • Photo is never stored
Face symmetry test 68 landmarks · 7 pairs
Drop a photo here, or choose one JPG or PNG. One face, looking straight at the camera.
Click to choose a different photo

Your photo is measured and discarded. It is never written to a database.

Nobody is perfectly symmetrical

Here is one face three times. On the left, the left half mirrored onto itself. In the middle, the actual face. On the right, the right half mirrored. Both mirrors are plausible faces, and neither one is the person.

A portrait rebuilt from the left half of the face, mirrored onto itself
Left half, mirrored Narrower through the jaw, softer brow.
The unaltered portrait with the landmark mesh and the midline drawn over it
The actual face What the seven pairs are measured on.
A portrait rebuilt from the right half of the face, mirrored onto itself
Right half, mirrored Wider jaw, heavier brow line.

Seven pairs, one midline

Each pair is scored on its own, so you can see which part of your face carries the difference instead of only getting a single verdict.

Eyes L / R

Corner positions and how level the two eyes sit relative to the midline.

Eyebrows L / R

Height and arch. The most expressive pair, and often the least matched.

Ears L / R

How far each ear sits from the centre line. Hair covering one side will skew this.

Nose L / R

Whether the bridge and the nostrils track the midline or lean to one side.

Mouth L / R

Corner heights and the width of each half of the lips.

Upper cheek L / R

The width of the face at cheekbone height, measured on each side of the line.

Lower cheek L / R

The same measurement lower down, near the jaw, where asymmetry shows up most.

How the measurement works

Four steps, no black box. It is landmark detection followed by arithmetic.

  1. Find the face

    A detector locates the face in your photo and crops around it with a margin. If it finds zero faces or more than one, we stop and ask for a different photo.

  2. Place 68 landmarks

    A landmark model marks the jaw line, both eyebrows, both eyes, the nose and the mouth. These points are the only thing the rest of the process looks at.

  3. Draw the midline

    A vertical line is fitted through the centre of the face. Everything after this is measured as a distance from that line.

  4. Compare each pair

    For every feature pair, the distance of the left point from the midline is compared to the distance of its right counterpart. A small difference scores high. The average of the seven pairs is your overall number.

Getting a clean read

The measurement is only as good as the photo. These four things move the score more than anything else.

  • Flat, even light

    Face a window or a lamp. Light from one side deepens the shadow on that half and pulls the landmarks with it.

  • Square to the camera

    Head level, eyes on the lens. A small turn makes one half of the face read narrower than it is.

  • A plain background

    A busy background behind your head makes the face harder to isolate, especially around the jaw and ears.

  • Nothing across your face

    Push hair back, take off glasses and hats. Anything covering one side is measured as part of that side.

What your number actually means

The score is the average of the seven pair scores. It describes one photograph, not your face, and it is not a ranking against anyone else.

95 to 100

The differences are smaller than the noise in an ordinary photo. At this level, your lighting and head angle move the number about as much as your face does.

88 to 95

Small, evenly spread differences across most pairs. Nothing that reads as lopsided at conversational distance.

80 to 88

One or two pairs sit clearly off the midline. This is usually the feature you already notice in photos of yourself.

Below 80

Either a genuinely asymmetric feature or a difficult photo. Shoot again with flat light and a level head before reading anything into it.

Symmetrical and asymmetrical faces

Two descriptions of the same thing, seen from either side of the line.

A symmetrical face

The left and right sides land in nearly the same place when you fold the face down the middle.

  • Eyes level with each other and similarly shaped
  • Nose bridge and nostrils tracking the centre
  • Mouth corners at the same height
  • Cheekbones equally prominent on both sides

Symmetry turns up often in research on facial attractiveness, usually as one signal among many rather than the whole story.

An asymmetrical face

One or more features sit measurably further from the midline on one side than the other.

  • One eye slightly higher or a different shape
  • A smile that lifts more on one side
  • A nose that leans away from centre
  • A jaw with a different contour left and right

This is the normal case. Perfectly symmetrical faces are essentially nonexistent, and the small differences are most of what makes a face recognisable.

Questions

How does the facial symmetry analysis work?
A face detector finds your face in the photo and crops it. A landmark model then places 68 points along your jaw, eyebrows, eyes, nose and mouth. We draw a vertical midline through the face and, for each of seven feature pairs, compare how far the left point sits from that line against how far its right counterpart sits. The smaller the difference, the higher the score for that pair. Your overall number is the average of the seven.
What is extracted from the uploaded photo?
Only geometry. We read the positions of 68 landmark points and the distances between them. Nothing about skin, hair, age or identity is measured, and no face recognition is performed. The cropped face is shown back to you on the results page and is not kept afterwards.
Are the photos stored or used in any other way?
No. The photo is processed in memory to produce your score, handed to the results page, and then it is gone. It is not written to a database, not saved to disk, and not used to train anything.
Is the facial symmetry check free?
Yes, completely free, with no account and no limit on how many photos you run. Advertising on the site covers the cost of running it.
How accurate is the facial symmetry analysis?
The measurement itself is exact: given a set of landmarks, the arithmetic is the same every time. The uncertainty lives in the photo. A small head tilt, a smile that is wider on one side, or light coming from one direction will all move the landmarks and therefore the score. Run the same face twice with different photos and you should expect a few points of drift. Treat the number as a reading of that photo rather than a fixed property of your face.
Can it analyse group photos?
Yes, but it measures one face: the largest one in the frame. That is the person closest to the camera, which is almost always the subject. For a reading you can trust, use a photo with just you in it, since a face further back is smaller, softer and measures less reliably.
How can I improve the accuracy?
Face the camera straight on, keep your head level, use flat even light with no strong shadow on one side, and clear your face of hair, glasses and hats. A neutral expression helps more than people expect, because a natural smile is rarely symmetric.
How often can I use it?
As often as you like. Running two or three photos of yourself is a good idea, because it shows you how much of the score comes from your face and how much comes from the shot.

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