Network Diagram Maker

A network diagram shows devices and their connections so teams can explain a LAN, review uplinks, and document a physical or logical topology. Open a finished example below, or describe your own network diagram. Free, no signup; hourly fair-use limits apply.

Decide whether you are documenting physical cabling or logical connectivity before listing devices. A physical view may show switches, access points, uplink speeds, and ports. A logical view may emphasize VLANs, gateways, and links between network zones. Mixing both without labels makes a network diagram harder to use when someone is troubleshooting an outage or planning an expansion.

Give each device a stable name and describe every connection explicitly. For a branch office, begin with the gateway and access switch, then add PCs, printers, and wireless access points. Include link speeds and VLAN labels where they matter, and distinguish a trunk from an access connection. For a data center, a spine-leaf layout can show how leaf switches reach the spines and which hosts attach to each leaf. The layout is an explanation of topology, not an automatic discovery scan.

The examples illustrate a branch LAN, several link types in one fabric, and a spine-leaf network. Open one to inspect the finished diagram, then adapt the prompt to your equipment. Before sharing it, check device names, redundant paths, and every uplink against your actual inventory. Do not paste passwords, private keys, or sensitive configuration into a diagram request. The output cannot verify live reachability, firewall rules, or available bandwidth. Use it as an infrastructure document, and validate configuration and connectivity separately with the tools your network team already uses.