# Signature Pad

> A signature field that feels like ink: strokes thin out as you move faster and thicken with pen pressure, curves are smoothed through midpoints, and a ghost signature draws itself as a hint. Undo, clear, pick an ink, or switch to Type for a keyboard-friendly script signature. Exports a transparent PNG.

- Slug: `signature-pad`
- Category: [Inputs](https://www.assembli.design/category/inputs.md)
- Type: component
- Tags: signature, canvas, drawing, pen, form, pointer, accessibility
- npm dependencies: motion, lucide-react
- shadcn/ui dependencies: button
- Added: 2026-10-15
- Live preview: https://www.assembli.design/preview/signature-pad
- Page: https://www.assembli.design/components/signature-pad

## Install

One-time setup (needs a subscription):

1. Add the registry to the project's `components.json`: `{"@assembli":{"url":"https://www.assembli.design/r/{name}.json","headers":{"Authorization":"Bearer ${ASSEMBLI_API_KEY}"}}}` (merge into `"registries"`).
2. Put an API key from https://www.assembli.design/account in `.env.local` as `ASSEMBLI_API_KEY=asm_…`.

Then install with the shadcn CLI (writes `components/signature-pad/signature-pad.tsx` and installs dependencies):

```bash
npx shadcn@latest add @assembli/signature-pad
```

Registry item JSON: https://www.assembli.design/r/signature-pad.json (send `Authorization: Bearer <api key>`)

## Code

> Component source needs an Assembli subscription ($12/month) and an API key sent as `Authorization: Bearer <key>`. To get one without copying anything, POST https://www.assembli.design/api/agent/login (or call the MCP tool connect_account), show the user the link it returns, and poll https://www.assembli.design/api/agent/token for the key. Or subscribe at https://www.assembli.design/pricing and create a key at https://www.assembli.design/account.