Diagram Maker
A free online diagram maker for flow, network and architecture diagrams. Use shapes, connectors and labels to show how the parts of a system fit together, then export to PNG or SVG. Everything runs in your browser, with no account, no upload and no watermark.
Build a diagram online free with a browser diagram maker for flow, network and architecture diagrams. Use shapes, connectors and labels to show how the parts of a system, a network or a concept fit together, then export a crisp image. It is a freeform diagram tool with no template lock-in and no account, a lightweight alternative to draw.io or Lucidchart for a quick sketch. Save to PNG or SVG for your docs or slides.
- No sign-up, ever
- 100% free
- Nothing uploaded
- Export to PNG & SVG
- Works offline after first load
How to use it
- 1
Lay out the parts
Place a shape for each component or node and label it so the diagram reads on its own.
- 2
Connect them up
Draw connectors to show how the parts relate, and add text along the lines where it helps.
- 3
Export the diagram
Save to PNG or SVG, or copy a selection to drop into documentation or a slide.
When it comes in handy
System architecture
Sketch how services, databases and clients connect at a glance.
Network diagrams
Map devices and links so a setup is easy to explain and review.
Concept diagrams
Show how ideas or entities relate without committing to a rigid format.
Instant & 100% private — nothing is uploaded
Everything you draw is handled right here in your browser. Your canvas is never sent to a server, so there is no sign-up, no email wall, and no project cap from us. Load the page once and it keeps working even if you go offline.
Frequently asked questions
- What kinds of diagrams can I make?
- Anything built from shapes, lines and text: flow diagrams, network maps, simple architecture sketches, entity relationships and concept diagrams. The canvas is freeform, so you are not boxed into one template.
- Can I add images to a diagram?
- Yes. Drop an image onto the canvas to use as an icon or a reference, and it is kept on your device along with the rest of the drawing.
- How do I export the diagram for documentation?
- Export to SVG when you want the diagram to stay sharp inside a doc or a wiki at any zoom, or PNG for a simple flat image. You can also copy a selection to paste straight into your documentation or a slide.
- Can I use this instead of draw.io or Lucidchart?
- For a quick flow, network or architecture sketch, yes: it covers shapes, connectors and labels with nothing to install and no account. Dedicated tools like draw.io or Lucidchart add template libraries and live collaboration, so this is the faster pick for a one-off diagram that stays private on your device.
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