No sign-up · nothing uploaded · free
The diagram tool that keeps your work in your browser
Draw cloud architecture, flowcharts, sequence diagrams and ERDs — 20 auto-layout diagram types and a free-form canvas, with 37 templates to start from. Everything renders locally and exports to PNG and SVG. No account, no upload, no watermark.
Opens straight into an editable AWS architecture diagram.
What makes it different
Most browser diagram tools ask you to make an account and then hold your work on their servers. This one does neither.
Two editors, one tool
Place everything yourself on a free-form canvas when the arrangement matters. Let the layout engine do it when the content is the point. Both live in the same sidebar.
Learn more →Edit on the picture
There is no source pane and no syntax to learn. Double-click a shape to rename it, drag a dot to connect it, tap an item on an auto-layout diagram to open its fields.
Learn more →Real provider icons
AWS, Azure, Google Cloud, Kubernetes, Docker, Terraform, Postgres, Kafka and hundreds more — bundled into the app, so they render offline.
Learn more →Export without limits
PNG at up to 4× for slides, or SVG that stays sharp and opens as editable shapes in Figma, Illustrator and Inkscape. No watermark, no export cap.
Learn more →Nothing is uploaded
Diagrams are drawn, rendered and stored in your browser. Even share links keep the diagram inside the URL fragment, which browsers never send to a server.
Learn more →Works on a phone
Pinch to zoom, drag to pan, tap to edit. Panels slide over the drawing instead of squeezing it, so the canvas keeps the whole screen.
Learn more →Everything you can draw
One tool for the whole set, so a system diagram and the sequence diagram that explains it do not live in two different apps.
- AWS and cloud architecture diagrams
- Flowcharts and process diagrams
- Sequence diagrams
- Entity relationship diagrams (ERD)
- UML class diagrams
- C4 model container diagrams
- Kubernetes and network topology
- State machines and user journeys
- Gantt charts and delivery plans
- Kanban boards and mindmaps
- Org charts and sitemaps
- Sankey, radar, treemap and XY charts
How it works
- 1
Pick a starting point
Press ⌘/Ctrl + K and choose from 37 real diagrams — or start from a blank canvas.
- 2
Edit on the diagram
Double-click to rename, drag a dot to connect, tap an item to open its fields. No source pane, no syntax.
- 3
Export and keep it
PNG or SVG for the document, and a .diagram.json file you own for the next time you need to change it.
Your diagrams never leave your machine
There is no diagram storage on any server here, because there is nothing to store to. Diagrams are drawn, rendered, exported and saved in your browser. Share links carry the diagram inside the URL fragment — the one part of a link browsers never transmit. Nothing expires, nothing leaks, and there is no copy of your architecture sitting in somebody else’s database.
How privacy works here →Common questions
- Is it free?
- Yes — free and unlimited, with no account, no trial and no paid tier. Ads on the site pay for hosting.
- Do I need to sign up?
- No. There is no login. Open the studio and start drawing.
- Are my diagrams uploaded anywhere?
- No. Diagrams are created, rendered and stored entirely in your browser. There is no server-side diagram storage, so nothing is transmitted — including when you export or share.
- Do I have to learn Mermaid or PlantUML?
- No. Every diagram is edited directly on the picture. Diagram source is an internal detail you never see or write.
- Can I export high-resolution images?
- Yes. PNG at 1×, 2×, 3× or 4×, with a transparent, white or matching background, and SVG for anything that needs to stay sharp or stay editable.
- How do I keep a diagram permanently?
- Save it to your disk with Ctrl/⌘ + S. You get a .diagram.json file that belongs to you and reopens fully editable with Ctrl/⌘ + O.
What should we build next?
There is no roadmap committee here — features get built because someone asked for them. If the tool is missing something you need, or something about it is annoying you, say so.
No account needed. We ask for your email so we can actually reply — it is used for nothing else.
Documentation
Getting started
From an empty tab to an exported diagram, in about a minute.
The free-form canvas
Shapes, connectors, snapping and selection on the canvas you control.
Styling and provider icons
Colours, provider logos, line styles and the sketch look.
Auto-layout diagrams
Diagrams that place themselves, edited by tapping the picture.
Every diagram type
The complete list of what you can draw here, and which editor each uses.
Templates
37 real diagrams to fork, not empty stubs.
Saving your work
Where diagrams are kept, and how to keep a copy that is yours.
Exporting PNG and SVG
PNG at up to 4×, SVG, transparent backgrounds, and copy to clipboard.
Sharing a diagram
How a share link works, and why it still keeps the diagram private.
Keyboard shortcuts and gestures
The full list of keys, mouse actions and touch gestures.
Privacy and your data
What never leaves your machine, and what the site's cookies do.
Start your first diagram
Nothing to install, nothing to sign up for. The studio opens straight into a diagram you can edit.
Open the studio