A clean, lightweight signature canvas for collecting legally usable e-signatures inside your app. Users draw with smooth ink, instantly see a thumbnail preview, and export the result with a single tap—perfect for forms, checkouts, and approvals on mobile and web.

Functionality

• Smooth freehand ink with anti-aliasing and stroke smoothing

• Adjustable pen size and color; optional pressure sensitivity (stylus)

• One-tap Download (PNG/JPEG/SVG) and base64 export

• Live thumbnail/preview of the last saved signature

• Auto-trim & smart crop (remove extra whitespace)

• Transparent or solid background; optional watermark & timestamp

• Undo/redo, clear canvas, and empty-signature validation

• High-DPI rendering that scales with device pixel ratio

• Optional background image (sign over forms/photos)

• Local save or upload to storage/DB via callback hooks

• Theming: rounded corners, shadows, FAB position, colors

• Accessibility: large hit targets, keyboard hints, screen-reader labels

• Works offline; responsive on phones, tablets, and desktop

Use cases

• Contracts, NDAs, and service agreements

• Order confirmations and in-store pickups

• Proof of delivery and field-service reports

• Invoices, receipts, and authorizations

• Patient consent forms and clinic intake

• Rental/lease check-in and check-out flows

• HR onboarding and internal approvals

• Support tickets and warranty claims

Keywords
signature pad, e-signature, digital signature, signature canvas, draw signature, base64 export, PNG export, JPG export, SVG export, download button, thumbnail preview, stroke smoothing, pressure sensitivity, stylus support, undo redo, clear canvas, smart crop, trim whitespace, transparent background, watermark, timestamp, high DPI, responsive UI, offline friendly, upload to storage, form signing, proof of delivery, consent form, contract signing, Flutter widget, FlutterFlow component, callbacks, onSave, onClear, accessible controls, theming, modern UI.