Harness-size canvas
Work on a large blank drawing surface sized for real automotive systems, not tiny example schematics.
wirediagram.io
Automotive wiring diagrams for real harness builds.
Plan batteries, fuses, relays, modules, connector pins, and wire colors in one focused editor before the harness reaches the bench.
Free editorCloud projectsConnector libraries
Editor
A tool surface for the parts already on your bench.
Place automotive components, define custom modules, route pin-to-pin wires, choose common wire colors, and keep the diagram readable as the project grows.
Custom modules
Lay out ECUs, fuse panels, and user-defined modules with labeled connectors and high pin counts.
Connector libraries
Start with generic connectors, then unlock brand-specific libraries for faster harness documentation.
Build-ready exports
Export SVG, PNG, and JSON files for shop notes, forum threads, parts lists, and future project records.
Workflow
Trace the system before you crimp.
- Block out power, grounds, loads, modules, and connector groups.
- Draw wires with common solid or striped automotive colors.
- Label pins and connectors before cutting or crimping the harness.
- Save the project online or export the diagram for the bench.
Plans
Free while you draw. Pro when libraries save hours.
The editor should stay useful without a subscription. Paid features focus on connector data and project workflow.
Free$0
For hobby diagrams, early planning, and basic exports.
- Generic components
- Generic connectors
- Wire colors and labels
- Limited cloud projects
- PNG/SVG/JSON export
ProSubscription
For builders who need specific connector libraries and more project management.
- Brand-specific connector libraries
- More cloud projects
- Project folders
- Version history
- Higher quality exports
Accounts
Use the app subdomain when you want the tool.
The marketing site can explain the product, while app.wirediagram.io opens directly into the editor for repeat users.