Draw Free Body Diagrams Online
Place pin supports, distributed loads, moments and dimensions as ready-made symbols, instead of building each one out of rectangles and arrows. For students, engineers, and educators.
The core tools are free with a Google sign-in. Built for desktop and laptop.
PlusStructural analysis for beams, trusses and framesEvery line color, fill and support style is yours to set.
Classic, dark modeExamples
11 worked diagrams — beams, trusses, frames, blocks on inclines, pulleys, and springs.
Black on white, one line weight. What an assignment or a printed report wants.
What you can draw
Supports
Pin, roller, fixed, and hinge supports drawn to textbook convention, placed in one click.
Loads
Point loads, distributed loads, moments, torsion, springs, and pulleys.
Annotations
Dimension lines, angle arcs, and text with superscript, subscript, and a math font.
Export
Download any area as PNG or SVG, at the resolution you choose.
Not only free body diagrams: with ortho, snapping, dimensions and SVG export, the same tools handle a quick 2D sketch — a layout, a section, a detail you want to hand someone — without opening a CAD package.
Plus, in the same Membership
Structural analysis
Drawn the free body diagram? Solve the structure too.
Draw a plane structure — a continuous beam, a truss, a portal frame — put loads, load cases and combinations on it, and read the reactions, the axial, shear and bending moment diagrams, the deflected shape, and a report with the calculation worked step by step. Solved by the direct stiffness method: two dimensions, linear elastic, small displacements.
Structural analysis results are for education and preliminary checking only, and must be verified independently. Every result is checked for equilibrium, and the program is compared against textbook solutions on its verification page.
Free and Membership
One Membership covers the FBD Drawer and structural analysis.
Free, with a Google sign-in
$0 forever
FBD Drawer
- 14 of the 26 tools: lines, shapes, curves, the four supports and point loads
- Grid and object snapping, ortho, undo, grouping and rotation
- As many diagrams as you like
Plus Structural analysis
- Beams, trusses and frames of up to 15 members
- Reactions, axial, shear, moment and deflection diagrams, one load case at a time
- A one-page summary report to print, watermarked
Both tools need a free Google sign-in. Editor drawings are not saved: closing or reloading the tab loses them.
Membership
From ~$3.33/month, billed annually
FBD Drawer
- All 26 tools, including distributed loads, dimensions, callouts and springs
- Export to PNG or SVG, at the resolution you choose
- 20 cloud projects, 11 ready-made templates and 100 of your own
- Custom colors on every element
Plus Structural analysis
- Models of any size
- Load combinations and envelopes
- The full report with the calculation worked step by step, as PDF or Word
- Up to 100 models kept in your account
New to any of this?
Two courses of step-by-step guides: free body diagrams from the first sketch to the equilibrium equations, and the direct stiffness method a frame is actually solved by.
Go to Guides & Tutorials