Open-source surfboard CAD
Design surfboards,
right in your browser.
OpenShaper is a free, open-source design app for shaping surfboards — outline, rocker, cross-sections and a live 3D model, with volume and weight as you go. No account, no paywall, nothing to install.
FREE FOREVER · GPL-3.0 · RUNS 100% IN YOUR BROWSER
- Length
- 5′08″
- Width
- 19¾″
- Thick
- 2¼″
- Volume
- 28.4 L
What it does
Everything you need to take a board from idea to blank.
Outline, rocker & cross-sections
Draw the planshape, tune the rocker, and sculpt rail-to-rail cross-sections with bézier control points — the three views every shape is built from.
Live volume & weight
Volume in litres and an estimated blank weight update as you shape, so you can dial a board to your weight and ability without guesswork.
Real-time 3D preview
A lofted 3D model rebuilds as you edit. Spin it, check the foil, and catch problems before they reach foam or timber.
Export STL, DXF & PDF
Send an STL to a CNC machine or 3D printer, DXF outlines to a cutter, or print 1:1 PDF templates for hand-shaping.
Runs on your machine
No account, no upload, no server. Your designs never leave the browser — open it on a plane, in the shaping bay, anywhere.
Free & open-source
Released under the GPL-3.0. Every feature is free, the source is on GitHub, and it always will be.
How it works
Three views, one shape.
Sketch the outline
Start from a template or a blank, then pull the curve to your length, width and tail.
Refine rocker & rails
Adjust the rocker profile and cross-sections while volume and weight track every move.
Export & build
Send G-code-ready geometry to a CNC, or print templates and shape it by hand.
Who it's for
Built for people who make things.
Whether you're gluing up a hollow timber frame or roughing out your first PU blank, OpenShaper gives you the numbers and the shape before you commit a cut.
The story behind the project →- Backyard & garage shapers cutting their first blanks
- Hollow-wooden & timber builders planning frames and panels
- Students and tinkerers learning how board design works
- Working shapers who want a free second tool for quick ideas
Learn the craft
New to board design?
Surfboard design explained
Outline, rocker, rails, foil, volume and fin setups — what each one does and how it changes the way a board rides.
Read more →GuideConstruction methods compared
PU/PE, EPS/epoxy, hollow wooden, chambered and more — weight, feel, durability, cost and how to build each.
Read more →Frequently asked questions
Is OpenShaper really free?
Do I need to install anything?
Can I use it to drive a CNC machine?
Where is my design stored?
Design your next board
Open the editor and start shaping — free, in your browser, nothing to install.