Upload a straight-on photo of a face. The tool levels the eyes, splits the face down the middle and builds two mirrored composites (left + left and right + right), an asymmetry heat map and a symmetry score from facial landmarks. Your photo never leaves your device.
Last updated:
Demo face loaded. Upload your own photo, or drag the points to see how the score reacts.
Photo & landmarks
Drop the photo here
Drag the dots onto: both pupils, both brows (middle), nose tip, both mouth corners and the chin.
--/ 100
Symmetry score
Average deviation--
Mirror pixel similarity--
Head tilt corrected--
Feature
Deviation
Original (levelled)Left + leftRight + rightAsymmetry map
Left and right refer to the halves as they appear in the photo. Just for fun: symmetry is not a measure of beauty or health.
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How to use the Face Symmetry Test
Upload a photo (or drop it on the board): face the camera, neutral expression, even lighting, hair off the face.
Wait for detection, or drag the eight points onto the eye centres, brows, nose tip, mouth corners and chin yourself.
Check the midline: the dashed line passes through the midpoint between the pupils after levelling the eyes.
Compare the composites and read the symmetry score and breakdown.
Download any composite as a PNG.
How the face symmetry test works
Level the eyes. The angle of the line between the two eye centres is measured and the image is rotated by that angle, so a slightly tilted head does not count as asymmetry.
Find the midline. The vertical line through the midpoint between the eyes becomes the axis of symmetry.
Mirror and measure. For each pair of features one point is reflected across the midline and its distance from its partner is measured. Single midline features (nose tip, chin, lip centre) are measured by their sideways distance from the line.
Normalise. Every distance is divided by the inter-eye distance, so the result does not depend on photo size.
Score. Score = 100 − 4 × (average deviation in % of eye distance). An average deviation of 2.5% gives 90, 5% gives 80.
The mirror pixel similarity is the correlation between the brightness of the left half of the levelled face and the mirrored right half. It reacts to lighting and hair as well as shape, so treat it as a second opinion.
Reading the score
Score
Average deviation
What it usually means
92-100
under 2%
Very symmetrical photo; differences are hard to see
84-91
2-4%
Typical well-posed portrait
75-83
4-6%
Mild asymmetry, often from expression or a slight head turn
60-74
6-10%
Noticeable asymmetry; check head pose, smile and point placement
below 60
over 10%
Usually a turned head or misplaced points
Tips for an accurate result
Look straight into the lens with the camera at eye level, at least an arm's length away (close wide-angle selfies distort the face).
Use a neutral expression with lips relaxed; smiles are rarely symmetrical.
Choose soft, even light from the front, and keep hair away from the face.
Zoom in on the browser if needed and place the points precisely on the pupil centres, mouth corners and the lowest point of the chin.
Frequently asked questions
How is the symmetry score calculated?
The photo is rotated so both eye centres are level, and the vertical line through the midpoint of the eyes is used as the facial midline. Each paired feature (brows, mouth corners and, with automatic detection, eye corners, nose wings, cheeks and jaw) is mirrored across that line and its distance from its partner is measured. Single features such as the nose tip and chin are measured by their distance from the midline. Distances are divided by the distance between the eyes, averaged, and the score is 100 minus 4 times that average percentage.
What are left-left and right-right composites?
A left-left composite joins the left half of the photo with its own mirror image, and a right-right composite does the same with the right half. Because no face is perfectly symmetrical, the two composites usually look like slightly different people, which makes asymmetries easy to see.
Is my left side the left side of the photo?
Not necessarily. In a normal photo taken by someone else, the left half of the image shows the person's right side. Many phone front cameras mirror selfies, which flips this. The tool labels halves as they appear in the photo.
Is a higher score more attractive?
This is a fun measurement, not a beauty rating. Research has found only weak links between symmetry and perceived attractiveness, and small asymmetries are completely normal. Head pose, expression, lighting and lens distortion change the result more than real differences do.
Why does my score change between photos?
Turning or tilting the head slightly, smiling unevenly, uneven light or a wide-angle lens held close to the face all shift the landmarks. For the most consistent results use a photo taken from at least an arm's length away, straight on, with a neutral expression.
Is my photo uploaded?
No. The image is decoded and analysed entirely in your browser. When automatic detection is used, only the face-landmark model files are downloaded from a public CDN; your photo is never sent anywhere.
What if automatic detection doesn't work?
If the model cannot load (for example offline or on a very old browser) or no face is found, the points are placed in typical positions and you can drag them onto the right features. The score and composites update as you move them.
Are all the tools on FreeToolCabin tested for quality and accuracy?
Yes! Every tool on our site undergoes automated Q/A testing in real browser environments to ensure high precision, correct output, and zero errors. If you happen to spot a bug or have a suggestion, please contact us at [email protected] and our team will review it right away.