← ToolsConverters
Diagram board.
Draw an architecture diagram by hand — boxes, arrows, labels — or describe one in a sentence and let your own model sketch it out. Exports SVG and PNG; the board lives in your browser.
Bring your own key.
No account here, no trial key, no request routed through us and billed to us. Paste a key from a provider you already pay for, pick a model, describe the diagram — the key goes from this tab straight to that provider and dies with the tab.
OpenRouter
openrouter.ai/keysGoogle Gemini
aistudio.google.com/app/apikeyCustom (OpenAI-compatible)
any OpenAI-compatible endpoint · key is yours
Ten requests a minute per address — after that the route asks you to wait.
Provider
Sent with that one request — never stored, never logged, never in the URL.
The model returns topology and labels only — never coordinates. The client packs the graph onto a layered grid, so the result is tidy whatever the model does.
How to use.
- Start from a template or draw on the blank canvas — boxes, arrows and labels, arranged with the pointer.
- The board autosaves to this browser as you draw, so you can close the tab and come back to it.
- Export as SVG for docs, PNG at 1–3× for slides, or .excalidraw to reopen the board later.
Related tools.
Mermaid diagrams
Paste Mermaid code — flowcharts, sequence diagrams and more render live. Export SVG, PNG or JPG, transparent or themed.
Markdown to PDF
Markdown to a print-ready PDF with selectable text — styled preview, then your browser's Save as PDF. Mermaid blocks render as diagrams.
QR generator
Text, URL, phone or Wi-Fi credentials to a scannable QR. Download as PNG or SVG.
FAQ.
Where is the board stored?
In this browser's localStorage, keyed to this site only. No account, no upload, and clearing site data deletes it — download anything you want to keep.
Which export should I use?
SVG keeps selectable text and is a fraction of the size — paste it into docs. PNG at 2× or 3× is for slides and issue threads. JPG has no alpha, so it always needs a background. The .excalidraw file is the board itself, and reopens here or on excalidraw.com.
Can I use it with a screen reader?
Not for drawing — the canvas is pointer-first, and a freeform surface has no meaningful structure to announce. The six templates are the pointer-free route to a complete diagram; the AI generator will add a third.
Is the drawing library a heavy download?
Excalidraw is about 1MB, and it loads lazily only on this page. Every other route on the site is unaffected.
Does it use my data?
No. Nothing is uploaded and the board never leaves this tab — the same client-only promise as the rest of the tools.