TryPSLFree Face Symmetry Test
Check facial symmetry from a photo. Compare your eyes, brows and mouth corners, then see what each half of your face looks like mirrored.
Upload a photo to check facial symmetry
One adult. Front-facing. No beauty filter.
See an example resultIllustrated example · sample numbers
How to read your face symmetry results
In this example, the centers of the irises are 100 pixels apart. One brow point is 2 pixels higher than the other, so the brow-height result is 2% of iris distance.
The percentage describes that height gap. It does not mean the face is 98% symmetrical. We use the distance between the irises as the reference for all three measurements.
Try it with your photo2 ÷ 100 × 100 = 2%. Both distances are measured after leveling the eye line.
Illustration only. These numbers do not come from a real photo.
How to use the facial symmetry test
- 01
Choose a clear photo
Face the camera straight on, keep it at eye level and relax your expression. Use even light and keep hair or glasses away from your eyes, brows and mouth.
- 02
Check the points
Select eyes, brows or mouth. Check that the colored points line up with those features, then read the measurement below.
- 03
Compare the mirrored faces
See your original photo beside a face made from each half. You can save all three views together or download just your measurements.
How the facial symmetry checker works
The checker finds reference points on your face, allows for head tilt and measures differences between the two sides. Everything runs in your browser. Here is how we calculate the three results.
What is facial symmetry?
Facial symmetry is how closely the left and right sides of your face match across a central line. This test looks at eye size, brow height and mouth corner height in a photo. It does not measure facial depth or the full outline of your nose and jaw.
Find the points
MediaPipe Face Landmarker detects 478 reference points, called landmarks. We use selected points around the eyes, irises, brows and mouth for these measurements.
Allow for head tilt
We rotate the point coordinates until the iris centers are level. This accounts for a head tilted toward one shoulder, but cannot correct a head turned to one side.
Measure the differences
For eyes, we add the absolute differences in width and height. For brows and mouth corners, we measure the vertical gap between the points on each side.
Calculate the percentage
We divide each difference by the distance between the iris centers, then multiply by 100. This expresses the gap relative to a reference distance in your photo.
We use Google’s MediaPipe Face Landmarker to find the points. TryPSL calculates the measurements from them; these measurements have not been clinically validated.
What the test measures
Each result answers a different question about your photo. A smaller number means a closer match for that measurement. Compare eyes with eyes or brows with brows across similar photos; comparing the three numbers with each other will not tell you which feature is most asymmetric.
Eye size difference
We compare how wide and how open each eye looks, then add the two differences. Squinting or partly closing one eye can change the result. Because we level the eye line first, this does not measure whether one eye sits higher than the other.
Brow height difference
We compare the height of the middle point on each eyebrow after allowing for head tilt. Raising one brow changes the result. Differences in eyebrow shape or thickness are not included.
Mouth corner difference
This measures the height difference between your lip corners after allowing for head tilt. Keep your mouth relaxed, since smiling or opening it can move the corners. It does not measure lip fullness.
Face symmetry mirror: compare both halves
See a face made from two left halves and another made from two right halves. Compare them with the original to spot differences in the photo.
We find a center line through the detected face points and align all three views to it. This keeps an off-center photo from being split in the wrong place. Left and right always mean the sides of the photo as displayed.
Flipping the whole photo simply swaps its sides. Mirroring one half repeats the features on that side, so the two versions can look quite different. You can switch between views on your phone or save all three as one image.
Why your results change between photos
Small changes in how you take a photo can change the numbers. Keep these four things consistent when comparing results.
Head turn
Look straight at the lens. Turning to one side makes some features appear narrower, even when the photo looks nearly front-facing.
Expression
Keep your eyes comfortably open, brows relaxed and lips gently closed. Smiling or squinting moves the points we measure.
Light and focus
Face a soft light and use a sharp original photo. Shadows and blur can make it harder to place the points correctly.
Camera distance
Avoid a very close selfie. Keep the camera at eye level and use the same distance each time, with your whole face clearly visible.
If the tool detects too much head turn, blur, closed eyes or several photo problems together, it asks you to retake the photo before showing results. Even without a warning, check that the points are in the right places.
Face symmetry test FAQs
How symmetrical is my face?
A clear, front-facing photo can help you compare the two sides. This test shows differences in eye size, brow height and mouth corner height, with points you can check on the photo. It does not measure every feature or give a single score for your whole face.
What does 2% of iris distance mean?
For brows, it means the height difference is 2% of the distance between the centers of your irises. A 2-pixel gap with a 100-pixel reference distance gives 2%. It does not mean your face is 98% symmetrical.
What is a good face symmetry score?
TryPSL shows three measurements, not an overall score. A smaller number means a closer match for that feature in your photo. We have not established a normal range for these measurements, so there is no good or bad cutoff to aim for.
How accurate is this face symmetry test?
We have not tested the results against clinical measurements, so we cannot give an accuracy percentage. Camera angle, expression and incorrectly placed points can all affect the numbers. Check the points yourself and use similar photo conditions when comparing results.
Why do my results change between photos?
A small head turn, smile or squint can change the measurements. Lighting and camera distance also affect the photo and how well the tool finds your features. Use the same setup and a relaxed expression when retaking a photo.
Why does my face look different in a mirror and a photo?
You see the two sides the other way around in a mirror compared with an unflipped photo. Camera distance, lighting and expression can add to the difference. Use Flip photo to compare both orientations of the same image.
What is the face symmetry mirror test?
It makes one face from two copies of the left half of your photo and another from two copies of the right. You can compare both with the original to see how the sides differ. The mirrored images do not tell you how attractive you are or how you would look after a treatment.
Why am I being asked to retake my photo?
The tool may have detected head turn, blur, closed eyes or several photo problems together. We ask for a retake before showing measurements or mirrored faces. Follow the tips beside your photo, and check the points again after choosing a new image.
Can this test tell me why my face is asymmetric?
No. A photo can show a difference without explaining its cause. This tool cannot diagnose a condition or recommend treatment.
Is the face symmetry test free and private?
Yes. You can use the test and download your results without an account or payment. Your photo and facial measurements stay in your browser and are cleared when you refresh or select Clear & choose another. Anything you download stays on your device; the mirror comparison includes your photo.