About Free Body Diagram Drawer

Free Body Diagram Drawer is an online tool built for physics students, engineers, and educators who need to draw structural mechanics and statics diagrams quickly. It skips the learning curve of heavy CAD programs and general-purpose vector software, so you can spend your time on the engineering problem instead of the drawing software.

Why we built this

General drawing software has no idea what a pin support is. Every standard engineering symbol — roller supports, fixed walls, point loads, distributed loads — has to be assembled by hand from rectangles and arrows, every single time. You shouldn't have to fight your tools to draw a beam with a moment force.

Here, those symbols are already tools. Everything runs in your browser, with nothing to download or install, so you can go from a blank canvas to a finished diagram without leaving the page.

It is not limited to free body diagrams either. Ortho mode, grid and object snapping, dimensions, text and SVG export cover the quick 2D sketch you would otherwise open a CAD package for — a layout, a section, a detail to hand to someone. It is a sketching tool rather than a drafting one: you work against the grid and the snaps rather than typing coordinates.

There is a second tool on the same site: Structural analysis, in beta, which solves the structure rather than draws it. Put a beam, a truss or a plane frame together, load it, and read the reactions, the axial, shear and bending moment diagrams, the deflected shape and a report you can print — by the direct stiffness method. It is free for anyone signed in while the testing lasts; only keeping models in your account — to open again from another machine — is part of a Membership.

The core drawing tools are free to use with no account. A Membership adds the rest of the tool set, PNG and SVG export, and cloud-saved projects so you can reopen and keep editing them. Whether it's a physics homework problem, a lecture you're preparing, or a structural project presentation, the diagram is a few clicks away rather than an afternoon of drafting.