Online controller calibration test for analog sticks
A good calibration pass starts with a slow, complete circle. Controller Checker records the values that the browser can see and keeps the workflow easy to repeat after cleaning or repair.
How to calibrate a PS5 or PS4 controller online
Move each stick slowly around its full outer edge, then return it to center. The live plot records the range visible to the browser so you can spot clipped corners, uneven axes, or a stick that never reaches its maximum.
Begin with a centered resting sample, use several slow rotations rather than one fast circle, and finish by releasing the stick. Repeat the same motion for both sticks. The graph is most useful for comparing the controller before and after an official calibration, profile change, cleaning, or repair.
What circularity error means for an analog stick
Circularity compares the stick's measured outer boundary with an ideal circle. A higher error can affect diagonal movement in games, but the acceptable range depends on the controller and its software profile.
Do not rank two controllers from one circularity percentage alone. Outer shape, center offset, axis symmetry, smoothness, and the response curve all affect feel. Some controllers intentionally use square or compensated output shapes that look different from an ideal circle.
Can a browser calibration test fix your joystick?
This page visualizes input and cannot write calibration values back to hardware. Use Xbox Accessories, PlayStation settings, Steam Input, or the manufacturer's utility to save a hardware profile.
Fix a controller that will not reach full analog stick range
Confirm that remapping software is not applying an outer dead zone, compare USB and wireless modes, and test in the operating-system controller panel. A consistent clipped direction can come from calibration, a sensor, the stick mechanism, or a software curve. Record the before-and-after range instead of changing several settings at once.