Equation Plotter graphs one or more functions of x, like sin(x) or x^2 - 3x + 2, over whatever range you choose, and lets you download the result as an image.
The basic operators (+, -, *, /, ^ for powers), parentheses, factorial (!), the constants pi and e, and sin, cos, tan, asin, acos, atan, log (base 10), ln (natural log), sqrt, abs, and exp. Trig functions are always evaluated in radians.
No, only explicit functions in the form y = f(x) are supported. An equation like a circle isn't a function of x in that sense (a single x can have two y values), and graphing it needs a different approach than plotting a curve point by point.
That's intentional, for functions with real breaks or asymptotes, like tan(x) or 1/x, the plot breaks the line instead of drawing a misleading connector across the gap.
No. Parsing and plotting the function happen entirely in your browser. Nothing you type is sent to a server.