Function Grapher
Plot functions like y = sin(x) on an interactive, zoomable graph
- Files never leave your device
- Runs in your browser
- Free, no sign-up, no watermark
Export
Drag to pan · scroll or pinch to zoom · Shift+scroll zooms x only, Alt+scroll y only · arrow keys pan, + / − zoom.
Points of interest
No roots, extrema or intersections in view.
How to use Function Grapher
Plot several functions at once: y = f(x), parametric and polar curves. It marks roots, minima, maxima, intersections and y-intercepts with their coordinates, and exports the graph as PNG or SVG.
- 1
Type a function in the Functions list, such as sin(x) or x^2 - 4, or add one from Examples.
- 2
Click Add function for more curves, and switch a curve's type to Parametric (x(t), y(t) with a Range) or Polar (r in terms of θ).
- 3
Drag to pan and scroll or pinch to zoom; use Reset view or Fit y to curves to reframe.
- 4
Turn on Mark roots, extrema & intersections and read the coordinates under Points of interest.
- 5
Export the graph as PNG or SVG.
Frequently asked questions
Are angles in degrees or radians?
Radians. sin(x) has a period of 2π here, unlike the Scientific Calculator, which defaults to degrees.
Why are no points marked on my parametric or polar curve?
Roots, extrema and intersections are found for y = f(x) curves only, and only within the visible area.
Can I plot x^2 + y^2 = 1?
Implicit equations are not supported. Plot a circle as a parametric curve, x = cos(t), y = sin(t), or as the polar curve r = 1.
How do I zoom one axis only?
Shift+scroll zooms x only and Alt+scroll zooms y only. With the keyboard, arrow keys pan and + / − zoom.
Are my functions saved?
Yes. Your curves are kept in your browser's local storage on this device, so they are still there next time. Nothing is uploaded.