Syncfusion Flutter PDF

https://pub.dev/packages/syncfusion_flutter_pdf
Admin
Syncfusion Flutter PDF is a feature-rich, non-UI library written natively in Dart for creating,...
Tokens:17,406
Snippets:131
Trust Score:9.9
Update:9 hours ago
Show doc for...
Tokens:
Raw
### Create PDF Document with Invoice Layout (main.dart)

Source: https://pub.dev/packages/syncfusion_flutter_pdf/example

This is the main.dart file from the syncfusion_flutter_pdf example. It creates a Flutter app with a button that generates a PDF invoice. The code imports necessary packages, defines a stateful widget, and implements the generateInvoice method that creates a PdfDocument, adds a page, draws a rectangle, generates a grid, draws header, grid, and footer, saves the document, and launches the file. It uses conditional imports for save_file_mobile.dart and save_file_web.dart.

```Dart
import 'package:flutter/material.dart';
// ignore: depend_on_referenced_packages
import 'package:intl/intl.dart';
import 'package:syncfusion_flutter_pdf/pdf.dart';

//Local imports
import 'save_file_mobile.dart' if (dart.library.html) 'save_file_web.dart';

void main() {
  runApp(const CreatePdfWidget());
}

/// Represents the PDF widget class.
class CreatePdfWidget extends StatelessWidget {
  const CreatePdfWidget({super.key});

  @override
  Widget build(BuildContext context) {
    return const MaterialApp(home: CreatePdfStatefulWidget());
  }
}

/// Represents the PDF stateful widget class.
class CreatePdfStatefulWidget extends StatefulWidget {
  /// Initalize the instance of the [CreatePdfStatefulWidget] class.
  const CreatePdfStatefulWidget({Key? key}) : super(key: key);

  @override
  _CreatePdfState createState() => _CreatePdfState();
}

class _CreatePdfState extends State<CreatePdfStatefulWidget> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('Create PDF document')),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            TextButton(
              style: TextButton.styleFrom(
                foregroundColor: Colors.white,
                backgroundColor: Colors.lightBlue,
                disabledForegroundColor: Colors.grey,
              ),
              onPressed: generateInvoice,
              child: const Text('Generate PDF'),
            ),
          ],
        ),
      ),
    );
  }

  Future<void> generateInvoice() async {
    //Create a PDF document.
    final PdfDocument document = PdfDocument();
    //Add page to the PDF
    final PdfPage page = document.pages.add();
    //Get page client size
    final Size pageSize = page.getClientSize();
    //Draw rectangle
    page.graphics.drawRectangle(
      bounds: Rect.fromLTWH(0, 0, pageSize.width, pageSize.height),
      pen: PdfPen(PdfColor(142, 170, 219)),
    );
    //Generate PDF grid.
    final PdfGrid grid = getGrid();
    //Draw the header section by creating text element
    final PdfLayoutResult result = drawHeader(page, pageSize, grid);
    //Draw grid
    drawGrid(page, grid, result);
    //Add invoice footer
    drawFooter(page, pageSize);
    //Save the PDF document
    final List<int> bytes = document.saveSync();
    //Dispose the document.
    document.dispose();
    //Save and launch the file.
    await saveAndLaunchFile(bytes, 'Invoice.pdf');
  }

  //Draws the invoice header
  PdfLayoutResult drawHeader(PdfPage page, Size pageSize, PdfGrid grid) {
    //Draw rectangle
    page.graphics.drawRectangle(
      brush: PdfSolidBrush(PdfColor(91, 126, 215)),
      bounds: Rect.fromLTWH(0, 0, pageSize.width - 115, 90),
    );
    //Draw string
    page.graphics.drawString(
      'INVOICE',
      PdfStandardFont(PdfFontFamily.helvetica, 30),
      brush: PdfBrushes.white,
      bounds: Rect.fromLTWH(25, 0, pageSize.width - 115, 90),
      format: PdfStringFormat(lineAlignment: PdfVerticalAlignment.middle),
    );

    page.graphics.drawRectangle(
      bounds: Rect.fromLTWH(400, 0, pageSize.width - 400, 90),
      brush: PdfSolidBrush(PdfColor(65, 104, 205)),
    );

```

--------------------------------

### Create a PDF document from simple text

Source: https://pub.dev/packages/syncfusion_flutter_pdf/versions/35.1.40+1

Creates a PDF with 'Hello World!' text using a standard font. Saves to 'HelloWorld.pdf' and disposes the document.

```dart
// Create a new PDF document.
final PdfDocument document = PdfDocument();
// Add a PDF page and draw text.
document.pages.add().graphics.drawString(
    'Hello World!', PdfStandardFont(PdfFontFamily.helvetica, 12),
    brush: PdfSolidBrush(PdfColor(0, 0, 0)),
    bounds: const Rect.fromLTWH(0, 0, 150, 20));
// Save the document.
File('HelloWorld.pdf').writeAsBytes(await document.save());
// Dispose the document.
document.dispose();
```

--------------------------------

### Create a PDF/A-1B conformance document

Source: https://pub.dev/packages/syncfusion_flutter_pdf/versions/35.1.40+1

Creates a new PDF document with conformance level PdfConformanceLevel.a1b, draws 'Hello World' text using a TrueType font, and saves it as 'conformance.pdf'. Dispose the document after saving.

```Dart
//Create a PDF conformance document.
final PdfDocument document = PdfDocument(conformanceLevel: PdfConformanceLevel.a1b)
  ..pages.add().graphics.drawString('Hello World',
      PdfTrueTypeFont(File('Roboto-Regular.ttf').readAsBytesSync(), 12),
      bounds: Rect.fromLTWH(20, 20, 200, 50), brush: PdfBrushes.black);
//Save and dispose the document.
File('conformance.pdf').writeAsBytesSync(await document.save());
document.dispose();
```

--------------------------------

### Import the syncfusion_flutter_pdf package

Source: https://pub.dev/packages/syncfusion_flutter_pdf/versions/35.1.40+1

Import the package to access PDF creation APIs.

```dart
import 'package:syncfusion_flutter_pdf/pdf.dart';
```

--------------------------------

### Add bookmarks to a PDF document

Source: https://pub.dev/packages/syncfusion_flutter_pdf/versions/35.1.40+1

Loads an existing PDF, creates a bookmark named 'Page 1', sets its destination to page 2 at offset (20,20), sets its color to red, saves, and disposes. Uses PdfBookmark and PdfDestination.

```dart
//Load the existing PDF document.
final PdfDocument document =
    PdfDocument(inputBytes: File('input.pdf').readAsBytesSync());
//Create a document bookmark.
final PdfBookmark bookmark = document.bookmarks.add('Page 1');
//Set the destination page and location.
bookmark.destination = PdfDestination(document.pages[1], Offset(20, 20));
//Set the bookmark color.
bookmark.color = PdfColor(255, 0, 0);
//Save the document.
File('bookmark.pdf').writeAsBytes(await document.save());
//Dispose the document.
document.dispose();
```

--------------------------------

### Encrypt an existing PDF document with AES-256

Source: https://pub.dev/packages/syncfusion_flutter_pdf/versions/35.1.40+1

Loads an existing PDF, sets user and owner passwords, and applies AES-256 encryption (PdfEncryptionAlgorithm.aesx256Bit). Saves the secured document to 'secured.pdf' and disposes the document.

```Dart
//Load the existing PDF document.
final PdfDocument document =
    PdfDocument(inputBytes: File('input.pdf').readAsBytesSync());

//Add security to the document.
final PdfSecurity security = document.security;

//Set password.
security.userPassword = 'userpassword@123';
security.ownerPassword = 'ownerpassword@123';

//Set the encryption algorithm.
security.algorithm = PdfEncryptionAlgorithm.aesx256Bit;

//Save the document.
File('secured.pdf').writeAsBytes(await document.save());

//Dispose the document.
document.dispose();
```

--------------------------------

### PDF document with flow layout

Source: https://pub.dev/packages/syncfusion_flutter_pdf/versions/35.1.40+1

Creates a PDF with flow layout text using PdfTextElement and pagination. Draws a line after the text and saves to 'TextFlow.pdf'.

```dart
const String paragraphText =
    'Adobe Systems Incorporated\'s Portable Document Format (PDF) is the de facto'
    'standard for the accurate, reliable, and platform-independent representation of a paged'
    'document. It\'s the only universally accepted file format that allows pixel-perfect layouts.'
    'In addition, PDF supports user interaction and collaborative workflows that are not'
    'possible with printed documents.';

// Create a new PDF document.
final PdfDocument document = PdfDocument();
// Add a new page to the document.
final PdfPage page = document.pages.add();
// Create a new PDF text element class and draw the flow layout text.
final PdfLayoutResult layoutResult = PdfTextElement(
        text: paragraphText,
        font: PdfStandardFont(PdfFontFamily.helvetica, 12),
        brush: PdfSolidBrush(PdfColor(0, 0, 0)))
    .draw(
        page: page,
        bounds: Rect.fromLTWH(
            0, 0, page.getClientSize().width, page.getClientSize().height),
        format: PdfLayoutFormat(layoutType: PdfLayoutType.paginate))!;
// Draw the next paragraph/content.
page.graphics.drawLine(
    PdfPen(PdfColor(255, 0, 0)),
    Offset(0, layoutResult.bounds.bottom + 10),
    Offset(page.getClientSize().width, layoutResult.bounds.bottom + 10));
// Save the document.
File('TextFlow.pdf').writeAsBytes(await document.save());
// Dispose the document.
document.dispose();
```

--------------------------------

### Sign existing PDF document with digital signature

Source: https://pub.dev/packages/syncfusion_flutter_pdf/versions/35.1.40+1

Loads an existing PDF document, retrieves the signature field, sets its signature with a certificate, and saves the signed document as 'output.pdf'.

```dart
//Load the existing PDF document.
final PdfDocument document =
    PdfDocument(inputBytes: File('input.pdf').readAsBytesSync());

//Get the signature field.
PdfSignatureField signatureField =
    document.form.fields[0] as PdfSignatureField;

//Get signature field and sign.
signatureField.signature = PdfSignature(
  certificate:
      PdfCertificate(File('certificate.pfx').readAsBytesSync(), 'password@123'),
);

//Save and dispose the document.
File('output.pdf').writeAsBytesSync(await document.save());
document.dispose();
```

--------------------------------

### Fill existing PDF form

Source: https://pub.dev/packages/syncfusion_flutter_pdf/versions/35.1.40+1

Loads an existing PDF document, retrieves the form, sets the text of a text box field, selects a radio button, and saves the modified document as 'output.pdf'.

```dart
//Load the existing PDF document.
final PdfDocument document =
    PdfDocument(inputBytes: File('input.pdf').readAsBytesSync());

//Get the form.
PdfForm form = document.form;

//Get text box and fill value.
PdfTextBoxField name = document.form.fields[0] as PdfTextBoxField;
name.text = 'John';

//Get the radio button and select.
PdfRadioButtonListField gender = form.fields[1] as PdfRadioButtonListField;
gender.selectedIndex = 1;

//Save and dispose the document.
File('output.pdf').writeAsBytesSync(await document.save());
document.dispose();
```

--------------------------------

### Create PDF form with text and check box fields

Source: https://pub.dev/packages/syncfusion_flutter_pdf/versions/35.1.40+1

Creates a new PDF document, adds a page, and adds a text box field and a check box field to the form. Saves the document as 'form.pdf'.

```dart
//Create a new PDF document.
PdfDocument document = PdfDocument();

//Create a new page to add form fields.
PdfPage page = document.pages.add();

//Create text box field and add to the forms collection.
document.form.fields.add(PdfTextBoxField(
    page, 'firstname', Rect.fromLTWH(0, 0, 100, 20),
    text: 'John'));

//Create check box field and add to the form.
document.form.fields.add(PdfCheckBoxField(
    page, 'checkbox', Rect.fromLTWH(150, 0, 30, 30),
    isChecked: true));

//Save and dispose the document.
File('form.pdf').writeAsBytesSync(await document.save());
document.dispose();
```

--------------------------------

### Add headers and footers to a PDF document

Source: https://pub.dev/packages/syncfusion_flutter_pdf/versions/35.1.40+1

Creates a PDF with header and footer text using PdfPageTemplateElement. The header is set to the top template and the footer to the bottom template. Two pages are added, and the document is saved as 'HeaderandFooter.pdf'.

```dart
//Create a new PDF document.
final PdfDocument document = PdfDocument();
//Create a PDF page template and add header content.
final PdfPageTemplateElement headerTemplate =
    PdfPageTemplateElement(const Rect.fromLTWH(0, 0, 515, 50));
//Draw text in the header.
headerTemplate.graphics.drawString(
    'This is page header', PdfStandardFont(PdfFontFamily.helvetica, 12),
    bounds: const Rect.fromLTWH(0, 15, 200, 20));
//Add the header element to the document.
document.template.top = headerTemplate;
//Create a PDF page template and add footer content.
final PdfPageTemplateElement footerTemplate =
    PdfPageTemplateElement(const Rect.fromLTWH(0, 0, 515, 50));
//Draw text in the footer.
footerTemplate.graphics.drawString(
    'This is page footer', PdfStandardFont(PdfFontFamily.helvetica, 12),
    bounds: const Rect.fromLTWH(0, 15, 200, 20));
//Set footer in the document.
document.template.bottom = footerTemplate;
//Now create pages.
document.pages.add();
document.pages.add();
// Save the document.
File('HeaderandFooter.pdf').writeAsBytes(await document.save());
// Dispose the document.
document.dispose();
```

--------------------------------

### Load and modify an existing PDF document

Source: https://pub.dev/packages/syncfusion_flutter_pdf/versions/35.1.40+1

Loads an existing PDF, draws text on the first page, saves the document, and disposes it. Uses PdfDocument, PdfPage, and PdfStandardFont.

```dart
//Load the existing PDF document.
final PdfDocument document =
    PdfDocument(inputBytes: File('input.pdf').readAsBytesSync());
//Get the existing PDF page.
final PdfPage page = document.pages[0];
//Draw text in the PDF page.
page.graphics.drawString(
    'Hello World!', PdfStandardFont(PdfFontFamily.helvetica, 12),
    brush: PdfSolidBrush(PdfColor(0, 0, 0)),
    bounds: const Rect.fromLTWH(0, 0, 150, 20));
//Save the document.
File('output.pdf').writeAsBytes(await document.save());
//Dispose the document.
document.dispose();
```

--------------------------------

### Create PDF grid with Syncfusion Flutter PDF

Source: https://pub.dev/packages/syncfusion_flutter_pdf/example

Defines a PdfGrid with 5 columns, styled header row, and built-in table style. Adds product rows via addProducts and sets cell padding and alignment.

```Dart
  //Create PDF grid and return
  PdfGrid getGrid() {
    //Create a PDF grid
    final PdfGrid grid = PdfGrid();
    //Secify the columns count to the grid.
    grid.columns.add(count: 5);
    //Create the header row of the grid.
    final PdfGridRow headerRow = grid.headers.add(1)[0];
    //Set style
    headerRow.style.backgroundBrush = PdfSolidBrush(PdfColor(68, 114, 196));
    headerRow.style.textBrush = PdfBrushes.white;
    headerRow.cells[0].value = 'Product Id';
    headerRow.cells[0].stringFormat.alignment = PdfTextAlignment.center;
    headerRow.cells[1].value = 'Product Name';
    headerRow.cells[2].value = 'Price';
    headerRow.cells[3].value = 'Quantity';
    headerRow.cells[4].value = 'Total';
    //Add rows
    addProducts('CA-1098', 'AWC Logo Cap', 8.99, 2, 17.98, grid);
    addProducts('LJ-0192', 'Long-Sleeve Logo Jersey,M', 49.99, 3, 149.97, grid);
    addProducts('So-B909-M', 'Mountain Bike Socks,M', 9.5, 2, 19, grid);
    addProducts('LJ-0192', 'Long-Sleeve Logo Jersey,M', 49.99, 4, 199.96, grid);
    addProducts('FK-5136', 'ML Fork', 175.49, 6, 1052.94, grid);
    addProducts('HL-U509', 'Sports-100 Helmet,Black', 34.99, 1, 34.99, grid);
    //Apply the table built-in style
    grid.applyBuiltInStyle(PdfGridBuiltInStyle.listTable4Accent5);
    //Set gird columns width
    grid.columns[1].width = 200;
    for (int i = 0; i < headerRow.cells.count; i++) {
      headerRow.cells[i].style.cellPadding = PdfPaddings(
        bottom: 5,
        left: 5,
        right: 5,
        top: 5,
      );
    }
    for (int i = 0; i < grid.rows.count; i++) {
      final PdfGridRow row = grid.rows[i];
      for (int j = 0; j < row.cells.count; j++) {
        final PdfGridCell cell = row.cells[j];
        if (j == 0) {
          cell.stringFormat.alignment = PdfTextAlignment.center;
        }
        cell.style.cellPadding = PdfPaddings(
          bottom: 5,
          left: 5,
          right: 5,
          top: 5,
        );
      }
    }
    return grid;
  }
```

--------------------------------

### Add bullets and lists to a PDF document

Source: https://pub.dev/packages/syncfusion_flutter_pdf/versions/35.1.40+1

Creates a PDF with an ordered list and an unordered sublist. The ordered list uses numeric markers with a helvetica font, line spacing, and text indent. The unordered sublist is attached to the first item of the ordered list and uses disk markers. The list is drawn on the page and saved as 'BulletandList.pdf'.

```dart
// Create a new PDF document.
final PdfDocument document = PdfDocument();
// Add a new page to the document.
final PdfPage page = document.pages.add();
// Create a PDF ordered list.
final PdfOrderedList orderedList = PdfOrderedList(
    items: PdfListItemCollection(<String>[
      'Mammals',
      'Reptiles',
      'Birds',
      'Insects',
      'Aquatic Animals'
    ]),
    marker: PdfOrderedMarker(
        style: PdfNumberStyle.numeric,
        font: PdfStandardFont(PdfFontFamily.helvetica, 12)),
    markerHierarchy: true,
    format: PdfStringFormat(lineSpacing: 10),
    textIndent: 10);
// Create a un ordered list and add it as a sublist.
orderedList.items[0].subList = PdfUnorderedList(
    marker: PdfUnorderedMarker(
        font: PdfStandardFont(PdfFontFamily.helvetica, 10),
        style: PdfUnorderedMarkerStyle.disk),
    items: PdfListItemCollection(<String>[
      'body covered by hair or fur',
      'warm-blooded',
      'have a backbone',
      'produce milk',
      'Examples'
    ]),
    textIndent: 10,
    indent: 20);
// Draw the list to the PDF page.
orderedList.draw(
    page: page,
    bounds: Rect.fromLTWH(
        0, 0, page.getClientSize().width, page.getClientSize().height));
// Save the document.
File('BulletandList.pdf').writeAsBytes(await document.save());
// Dispose the document.
document.dispose();
```

--------------------------------

### Add tables to a PDF document

Source: https://pub.dev/packages/syncfusion_flutter_pdf/versions/35.1.40+1

Creates a PDF with a table using PdfGrid. The grid has three columns and a header row with bold font. Three data rows are added with customer information. Cell padding is set and the grid is drawn on the page, then saved as 'PDFTable.pdf'.

```dart
// Create a new PDF document.
final PdfDocument document = PdfDocument();
// Add a new page to the document.
final PdfPage page = document.pages.add();
// Create a PDF grid class to add tables.
final PdfGrid grid = PdfGrid();
// Specify the grid column count.
grid.columns.add(count: 3);
// Add a grid header row.
final PdfGridRow headerRow = grid.headers.add(1)[0];
headerRow.cells[0].value = 'Customer ID';
headerRow.cells[1].value = 'Contact Name';
headerRow.cells[2].value = 'Country';
// Set header font.
headerRow.style.font =
    PdfStandardFont(PdfFontFamily.helvetica, 10, style: PdfFontStyle.bold);
// Add rows to the grid.
PdfGridRow row = grid.rows.add();
row.cells[0].value = 'ALFKI';
row.cells[1].value = 'Maria Anders';
row.cells[2].value = 'Germany';
// Add next row.
row = grid.rows.add();
row.cells[0].value = 'ANATR';
row.cells[1].value = 'Ana Trujillo';
row.cells[2].value = 'Mexico';
// Add next row.
row = grid.rows.add();
row.cells[0].value = 'ANTON';
row.cells[1].value = 'Antonio Mereno';
row.cells[2].value = 'Mexico';
// Set grid format.
grid.style.cellPadding = PdfPaddings(left: 5, top: 5);
// Draw table in the PDF page.
grid.draw(
    page: page,
    bounds: Rect.fromLTWH(
        0, 0, page.getClientSize().width, page.getClientSize().height));
// Save the document.
File('PDFTable.pdf').writeAsBytes(await document.save());
// Dispose the document.
document.dispose();
```

--------------------------------

### Sign new PDF document with digital signature

Source: https://pub.dev/packages/syncfusion_flutter_pdf/versions/35.1.40+1

Creates a new PDF document, adds a signature field with a certificate from a .pfx file, and saves the signed document as 'signed.pdf'.

```dart
//Create a new PDF document.
PdfDocument document = PdfDocument();

//Add a new PDF page.
PdfPage page = document.pages.add();

//Create signature field.
PdfSignatureField signatureField = PdfSignatureField(page, 'Signature',
    bounds: Rect.fromLTWH(0, 0, 200, 50),
    signature: PdfSignature(
       certificate:
          PdfCertificate(File('certificate.pfx').readAsBytesSync(), 'password@123')
    ));
  
//Add the signature field to the document.
document.form.fields.add(signatureField);

//Save and dispose the PDF document
File('signed.pdf').writeAsBytes(await document.save());
document.dispose();
```

--------------------------------

### Add product row to PDF grid

Source: https://pub.dev/packages/syncfusion_flutter_pdf/example

Adds a row to the PdfGrid with product details. Values are converted to strings for price, quantity, and total.

```Dart
  //Create and row for the grid.
  void addProducts(
    String productId,
    String productName,
    double price,
    int quantity,
    double total,
    PdfGrid grid,
  ) {
    final PdfGridRow row = grid.rows.add();
    row.cells[0].value = productId;
    row.cells[1].value = productName;
    row.cells[2].value = price.toString();
    row.cells[3].value = quantity.toString();
    row.cells[4].value = total.toString();
  }
```

--------------------------------

### Add or remove a page from an existing PDF document

Source: https://pub.dev/packages/syncfusion_flutter_pdf/versions/35.1.40+1

Loads an existing PDF, removes the first page, adds a new page with text, saves, and disposes. Uses PdfDocument and PdfPage.

```dart
//Load the existing PDF document.
final PdfDocument document =
    PdfDocument(inputBytes: File('input.pdf').readAsBytesSync());
//Remove the page from the document.
document.pages.removeAt(0);
//Add new page and draw text.
document.pages.add().graphics.drawString(
    'Hello World!', PdfStandardFont(PdfFontFamily.helvetica, 12),
    brush: PdfSolidBrush(PdfColor(0, 0, 0)),
    bounds: const Rect.fromLTWH(0, 0, 150, 20));
//Save the document.
File('output.pdf').writeAsBytes(await document.save());
//Dispose the document.
document.dispose();
```

--------------------------------

### Add images to a PDF document

Source: https://pub.dev/packages/syncfusion_flutter_pdf/versions/35.1.40+1

Draws a PNG or JPEG image using PdfBitmap. Reads 'input.png', draws it, saves to 'ImageToPDF.pdf', and disposes the document.

```dart
//Create a new PDF document.
final PdfDocument document = PdfDocument();
//Read image data.
final Uint8List imageData = File('input.png').readAsBytesSync();
//Load the image using PdfBitmap.
final PdfBitmap image = PdfBitmap(imageData);
//Draw the image to the PDF page.
document.pages
    .add()
    .graphics
    .drawImage(image, const Rect.fromLTWH(0, 0, 500, 200));
// Save the document.
File('ImageToPDF.pdf').writeAsBytes(await document.save());
// Dispose the document.
document.dispose();
```

--------------------------------

### Flatten existing PDF form

Source: https://pub.dev/packages/syncfusion_flutter_pdf/versions/35.1.40+1

Loads an existing PDF document, flattens all form fields, and saves the result as 'output.pdf'.

```dart
//Load the existing PDF document.
final PdfDocument document =
    PdfDocument(inputBytes: File('input.pdf').readAsBytesSync());

//Get the form.
PdfForm form = document.form;

//Flatten all the form fields.
form.flattenAllFields();

//Save and dispose the document.
File('output.pdf').writeAsBytesSync(await document.save());
document.dispose();
```

--------------------------------

### Extract text from a specific page of a PDF document

Source: https://pub.dev/packages/syncfusion_flutter_pdf/versions/35.1.40+1

Loads an existing PDF, extracts text from page 1 using startPageIndex: 0, and disposes the document.

```dart
//Load an existing PDF document.
PdfDocument document =
   PdfDocument(inputBytes: File('input.pdf').readAsBytesSync());
//Extract the text from page 1.
String text = PdfTextExtractor(document).extractText(startPageIndex: 0);
//Dispose the document.
document.dispose();
```

--------------------------------

### Load and modify an existing annotation

Source: https://pub.dev/packages/syncfusion_flutter_pdf/versions/35.1.40+1

Loads the first annotation from the first page, casts it to PdfRectangleAnnotation, and changes its text. Assumes the annotation exists.

```dart
//Load and modify the existing annotation.
final PdfRectangleAnnotation rectangleAnnotation =
    document.pages[0].annotations[0] as PdfRectangleAnnotation;
//Change the annotation text.
rectangleAnnotation.text = 'Changed';
```

--------------------------------

### Extract text from all pages of a PDF document

Source: https://pub.dev/packages/syncfusion_flutter_pdf/versions/35.1.40+1

Loads an existing PDF, extracts text from all pages using PdfTextExtractor, and disposes the document.

```dart
//Load an existing PDF document.
final PdfDocument document =
    PdfDocument(inputBytes: File('input.pdf').readAsBytesSync());
//Extract the text from all the pages.
String text = PdfTextExtractor(document).extractText();
//Dispose the document.
document.dispose();
```

--------------------------------

### Create a new rectangle annotation in a PDF document

Source: https://pub.dev/packages/syncfusion_flutter_pdf/versions/35.1.40+1

Loads an existing PDF, adds a rectangle annotation to the first page, saves, and disposes. Uses PdfRectangleAnnotation with setAppearance: true.

```dart
//Load the existing PDF document.
final PdfDocument document =
    PdfDocument(inputBytes: File('input.pdf').readAsBytesSync());
//Create a new rectangle annotation and add to the PDF page.
document.pages[0].annotations.add(PdfRectangleAnnotation(
      Rect.fromLTWH(0, 0, 150, 100), 'Rectangle',
      color: PdfColor(255, 0, 0), setAppearance: true));
//Save the document.
File('annotations.pdf').writeAsBytes(await document.save());
//Dispose the document.
document.dispose();
```
Tokens:
Raw