Lucidchart limits free documents and requires an account. These diagram tools are free with no sign-up.
Full-featured flowcharts, UML and network diagrams.
Draw.io, also called diagrams.net, is a free diagramming app for flowcharts, org charts, network diagrams, UML, ER diagrams and wireframes. It has a large shape library and hundreds of templates.
Quick sketchy diagrams and wireframes.
Excalidraw is a virtual whiteboard with a hand-drawn look. You sketch boxes, arrows, text and freehand lines that look like they were drawn on paper, which makes diagrams feel informal and easy to change.
Fast infinite canvas with clean shapes.
tldraw is a fast infinite canvas for drawing, diagramming and brainstorming. It has smooth freehand drawing, clean shapes, arrows that stay attached to objects, sticky notes, frames and images.
Draw.io is our top pick. Full-featured flowcharts, UML and network diagrams.
Yes. Every tool on this list has a free version you can use without paying. Some offer paid upgrades, but the core features listed here are free.
No. We only list tools that work without signing up.