Signdoc

A powerful Flutter package for adding digital signatures to PDF documents. Integrate signature functionality into your Flutter applications with a beautiful, customizable UI.

Features

• 📄 PDF Viewer: Built-in PDF viewer with smooth navigation
• ✍️ Signature Creation: Draw or create digital signatures with ease
• 🎨 Customizable UI: Fully customizable button texts and messages
• 📱 Responsive Design: Works on both mobile and desktop
• 🔧 Easy Integration: Simple API for quick implementation
• 💾 Export & Save: Save signed PDFs with embedded signatures
• 🖱️ Gesture Support: Drag, resize, and pinch-to-zoom signatures
• 📊 Multi-page Support: Navigate through multipage documents

Installation

Add signdoc to your pubspec.yaml:

dependencies:
  signdoc: ^latest_version

Then run:

flutter pub get

Usage

Basic Usage

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: SignatureDemo(),
    );
  }
}

class SignatureDemo extends StatelessWidget {
  final File pdfFile = File('path/to/your/document.pdf');

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text('Sign Document')),
      body: SignDocumentPage(file: File()!,
        onError: (message) {
// TODO: Show an error message to the user (e.g., Snackbar or dialog)
        },
        onSignedDocument: (file) async {
// TODO: Handle the signed document (save, upload, or preview it)
        },
        onCancelled: (reason) {
// TODO: Handle user cancellation (e.g., show notice or reset state)
        },
        uploadButtonMessage: "Save PDF",
        signatureColor: Colors.black,

        onSign: (signature) {
// TODO: Process the raw signature image (save locally, upload, or preview)
        },
        onPageChanged: (currentPage) {
// TODO: Update UI to show the current page number
        },
        onPlacementsChanged: (placements) {
// TODO: Track and update signature placements in the document
        },
        onSignatureModeChanged: (isSignatureMode) {
// TODO: Update UI when signature mode is toggled (enabled/disabled)
        },
      ));
  }
}

API Reference

Callbacks

• onSignedDocument(File signedFile): Called when the document is successfully signed and saved
• onError(Exception error): Called when an error occurs during the signing process
• onCancelled(String message): Called when the user cancels the signing process

Example

SignDocumentPage(file: File()!,
onError: (message) {
// TODO: Show an error message to the user (e.g., Snackbar or dialog)
},
onSignedDocument: (file) async {
// TODO: Handle the signed document (save, upload, or preview it)
},
onCancelled: (reason) {
// TODO: Handle user cancellation (e.g., show notice or reset state)
},
uploadButtonMessage: "Save PDF",
signatureColor: Colors.black,

onSign: (signature) {
// TODO: Process the raw signature image (save locally, upload, or preview)
},
onPageChanged: (currentPage) {
// TODO: Update UI to show the current page number
},
onPlacementsChanged: (placements) {
// TODO: Track and update signature placements in the document
},
onSignatureModeChanged: (isSignatureMode) {
// TODO: Update UI when signature mode is toggled (enabled/disabled)
},
)

Dependencies

This package uses the following dependencies:

• flutter_pdfview: For PDF rendering
• syncfusion_flutter_pdf: For PDF manipulation and signature embedding
• flutter: Flutter framework

Platform Support

Platform	Support
Android	✅ Yes
iOS	✅ Yes

Getting Help

If you encounter any issues or have questions:

• Check the example above
• Look at the API reference
• Open an issue on our GitHub repository

Contributing

We welcome contributions! Please feel free to:

• Fork the repository
• Create a feature branch
• Make your changes
• Submit a pull request

Support

For support and questions, please contact us at support@signdoc.com or create an issue in our GitHub repository.