Flutter Document SDK by Nutrient

Add powerful PDF functionality to your Flutter apps with the Nutrient Flutter SDK. View, annotate, and edit PDFs seamlessly across Android, iOS, and Web platforms.

Requirements

Flutter SDK (latest stable version)
For Android:
- Android Studio (latest stable version)
- Android NDK
- Android Virtual Device or physical device
For iOS:
- Xcode 16 or later
- iOS 16.0 or later
For Web:
- Modern web browser with WebAssembly support

Installation

Add the Nutrient Flutter SDK to your pubspec.yaml:

dependencies:
  pspdfkit_flutter: any

Run the following command:

flutter pub get

Platform Setup

Android Setup

Update your Android configuration in android/app/build.gradle:

android {
    compileSdkVersion 35
    
    defaultConfig {
        minSdkVersion 21
    }
    
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_17
        targetCompatibility JavaVersion.VERSION_17
    }

    kotlinOptions {
        jvmTarget = '17'
    }
}

dependencies {
    implementation 'androidx.appcompat:appcompat:<version>'
}

Update your theme in android/app/src/main/res/values/styles.xml:

- <style name="NormalTheme" parent="Theme.AppCompat.Light.NoActionBar">
+ <style name="NormalTheme" parent="PSPDFKit.Theme.Default">

Update your main activity to use FlutterAppCompatActivity:

import io.flutter.embedding.android.FlutterAppCompatActivity

class MainActivity: FlutterAppCompatActivity() {
}

iOS Setup

Make sure to set the minimum iOS version to 16.0 in your ios/Podfile:

platform :ios, '16.0'

Web Setup

The Nutrient Web SDK files are distributed as an archive that needs to be extracted manually:

Download Nutrient Web SDK. The download will start immediately and save a .tar.gz archive like PSPDFKit-Web-binary-<version>.tar.gz to your computer.
Once downloaded, extract the archive and copy the entire contents of its dist folder to your project's web/assets folder.
Verify your assets folder contains:
- pspdfkit.js file
- pspdfkit-lib directory with library assets
Add the Nutrient library to your web/index.html:

<script src="assets/pspdfkit.js"></script>

Note: Your server must have the Content-Type: application/wasm MIME type configured for WebAssembly files.

Sample Document Setup

Create a PDFs directory in your project root:

mkdir PDFs

Download our sample PDF document and save it as Document.pdf in the PDFs directory.
Add the assets directory to your pubspec.yaml:

flutter:
  assets:
    - PDFs/

Usage

Create a new file lib/main.dart with the following content:

import 'package:flutter/material.dart';
import 'package:pspdfkit_flutter/pspdfkit_flutter.dart';
import 'dart:io';
import 'package:flutter/foundation.dart';

const String documentPath = 'PDFs/Document.pdf';

void main() async {
  WidgetsFlutterBinding.ensureInitialized();

  // Initialize the Nutrient SDK with your license key
  await Pspdfkit.initialize(
    androidLicenseKey: 'YOUR_ANDROID_LICENSE_KEY',
    iosLicenseKey: 'YOUR_IOS_LICENSE_KEY',
    webLicenseKey: 'YOUR_WEB_LICENSE_KEY',
  );

   runApp(const MaterialApp(
    home: MyApp(),
  ));
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  Future<String> extractAsset(BuildContext context, String assetPath) async {

    if (kIsWeb) {
      return assetPath;
    }

    final bytes = await DefaultAssetBundle.of(context).load(assetPath);
    final list = bytes.buffer.asUint8List();
    final tempDir = await Pspdfkit.getTemporaryDirectory();
    final tempDocumentPath = '${tempDir.path}/$assetPath';
    final file = File(tempDocumentPath);

    await file.create(recursive: true);
    file.writeAsBytesSync(list);
    return file.path;
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: FutureBuilder<String>(
          future: extractAsset(context, documentPath),
          builder: (context, snapshot) {
            if (snapshot.hasData) {
              /// PspdfkitWidget is a widget that displays a PDF document.
              return PspdfkitWidget(
                documentPath: snapshot.data!,
              );
            } else if (snapshot.hasError) {
              return Center(
                child: Text('${snapshot.error}'),
              );
            } else {
              return const Center(
                child: CircularProgressIndicator(),
              );
            }
          }),
    );
  }
}

Note: Replace 'YOUR_ANDROID_LICENSE_KEY', 'YOUR_IOS_LICENSE_KEY', and 'YOUR_WEB_LICENSE_KEY' with your actual license keys. Do not pass any license keys if you want to run the SDK in demo mode, the SDK will run in demo mode with a watermark.

Learn More

Support

Visit our Support Center for help with the SDK.

License

This project is licensed under the Nutrient Commercial License. See LICENSE for details.