NoSignup Diagrams
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Your canvas is empty Drag a shape from the Shapes panel, or double-click anywhere to add a step. Hover a shape and drag one of its blue dots to another shape to connect them.

Free online diagram maker — no sign-up required

NoSignup Diagrams lets you draw flowcharts, UML diagrams, network maps, org charts, Gantt charts and more directly in your browser. There is no account to create and nothing to install: open an editor, start drawing and save your work as a file on your own computer.

Choose a diagram type

Flowchart Classic flowcharts with process, decision and input/output shapes for algorithms and workflows. Swimlane diagram Swimlane diagrams that show which team or role is responsible for each step of a process. Network diagram Network diagrams with servers, routers, firewalls and devices to document IT infrastructure. Architecture diagram Software architecture diagrams with services, queues, databases, caches and API gateways. Use case diagram UML use case diagrams with actors, use cases and system boundaries. Org chart Organisation charts with automatic tree layout — add a subordinate with a single key. Mind map Mind maps that branch out to both sides with automatic colours and layout. ER diagram Entity–relationship diagrams with crow's foot notation that export to SQL CREATE TABLE scripts. Class diagram UML class diagrams with attributes, methods, inheritance, composition and aggregation. State diagram State machine diagrams with transitions, choices, self-transitions and composite states. BPMN process BPMN process models with events, tasks, gateways, data objects and pools. Wireframe Wireframes for web and mobile screens with buttons, inputs, tabs, lists and image placeholders. Gantt chart Gantt charts with milestones, progress and dependencies — drag bars to reschedule. Kanban board Kanban boards with drag-and-drop cards, labels, due dates and WIP limits. Sequence diagram UML sequence diagrams with participants, messages, notes and loop/alt blocks.

Why NoSignup Diagrams?

No sign-up, no limits

Every editor is free and works immediately. There is no account, trial or watermark.

Your files stay with you

Diagrams are never uploaded to a server. Projects are saved as .zip files on your computer and opened again from there.

Export to PNG and PDF

Download a high-resolution image or a print-ready A4 PDF of any diagram with one click.

Available in 11 languages

The interface follows your browser language automatically, and you can switch at any time.

How it works

  1. Pick an editor from the list above or from the diagram type menu at the top of the page.
  2. Draw by dragging shapes onto the canvas and connecting them with the blue dots.
  3. Save or export: keep a .zip project to continue later, or download a PNG or PDF to share.