Free Network Diagram Software
Draw your sites, links and devices once, and keep the addressing, configuration and circuit details behind every shape.
Free forever on the Personal plan
Network diagrams: an example
Sites, links and devices
Campus, colocation and cloud edges on one canvas, with every link labelled by speed and purpose.
Configuration behind the shape
Management addresses, VLANs, firmware and circuit references open from the device itself.
One version, everywhere
Publish a change once and every page that embeds the diagram shows the latest version.
The basics
What is a network diagram?
A network diagram is a map of how devices, sites and services connect: routers, switches, firewalls, access points, servers and the links between them. A physical diagram shows ports and cables as installed; a logical one shows VLANs, subnets, routing and security zones.
Teams use network diagrams to troubleshoot outages, plan changes, onboard engineers and answer auditors. The picture says where things are, and the next questions (which VLAN, which firmware, which circuit reference) need the record behind each device.
In Blueprintr every device on the diagram can open its own record, so the network map and its documentation are one document instead of a drawing and a spreadsheet that drift apart.
Why Blueprintr
Network diagrams your engineers will keep using
Draw the topology quickly, then keep the operational detail in the same place.
Network icons and containers
Routers, switches, firewalls, access points, load balancers and servers from the generic network pack, or your own SVGs, grouped in containers for sites, racks and zones.
VellumDetail behind every device
Give any device a stratum with its management address, VLANs, firmware, serial number and support contract, in tables, notes and config snippets.
StratumNetwork discovery on Enterprise
Continuum Local sweeps the ranges you allow over SNMP from an agent inside your network and draws what it finds, with LLDP and CDP links, interfaces and routing.
ContinuumPhysical and logical views
Keep the cabling view and the VLAN or routing view as separate tabs in one blueprint, each with its own detail behind the shapes.
Published, linked, embedded
Publish the diagram once and share the link, or embed it in your wiki. Readers can open device details without an account.
BlueprintsExports that reopen
Export PNG, SVG, PDF, JPG or WebP. PNG and SVG exports open again in Vellum, so the copy attached to a ticket stays editable.
How to
How to make a network diagram in Blueprintr
Create a blueprint
Sign up free, create a blueprint and open the Vellum editor.
Lay out the sites
Add a container for each site or zone and name it with its address range.
Add devices and links
Drop routers, switches and firewalls from the network icon pack, connect them and label each link with its speed or purpose.
Attach the detail
Right-click a device and add a stratum with its addressing, VLANs, firmware and owner.
Publish and share
Publish the blueprint and share the link, or embed it where your team already works.
Start from a template
Enterprise campus network
A vendor-neutral campus with edge, core, distribution and access layers, and strata for the VLAN plan, port profiles, firewall zones and runbooks.
FAQ
Questions about network diagrams
Is this network diagram software free?
Yes. The Vellum editor, the network icon pack and strata are on the free Personal plan, in the browser and in the desktop app. Automatic network discovery with Continuum Local is part of Enterprise.
Can Blueprintr draw my network automatically?
On Enterprise, Continuum Local runs an agent inside your network, sweeps the address ranges you allow over SNMP and draws a blueprint from the results. On the other plans you draw the diagram yourself with icons and containers.
Which network icons are included?
Vellum includes a generic network pack with routers, switches, firewalls, load balancers, access points, servers and storage, plus AWS, Azure and Microsoft icons. You can also add your own SVG icons.
What is the difference between a physical and a logical network diagram?
A physical diagram shows devices, ports and cables as they are installed. A logical diagram shows how traffic flows: VLANs, subnets, routing and security zones. Many teams keep both as two tabs in one blueprint.
Can I import an existing network diagram?
Yes, from draw.io. The import wizard accepts .drawio and .xml files on every plan and can keep them in draw.io or convert them to Vellum. Visio files are not supported.
Can I share a network diagram outside my team?
Yes. Publish it as public or unlisted and share the link; readers can open it without an account. A private blueprint is visible only to the people you share it with.