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Published 20 days ago • Latest: 1.0.4
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Convert local HTML files into high-quality PDFs using native Android and iOS engines with full control over page size, margins, orientation, and DPI.

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native_html_to_pdf #

A Flutter plugin to convert local HTML files into PDF using native Android and iOS rendering engines.

Features #

  • Native rendering on Android and iOS
  • Converts local HTML files to PDF
  • Supports full HTML and CSS
  • Handles complex layouts like cards, tables, and multi-page content
  • Multiple paper sizes
  • Portrait and landscape orientation
  • Custom margins: left, top, right, bottom
  • Page range selection
  • DPI control for output quality
  • Works offline
  • Hidden WebView rendering
  • Supports dynamic/generated HTML content
  • Same API for Android and iOS

How it works #

  1. HTML file is loaded into a hidden WebView
  2. JavaScript notifies when rendering is complete
  3. Native print engine generates the PDF
  4. The PDF is saved locally and returned to Flutter

Supported Paper Sizes #

Use one of these exact values for printSize:

A0, A1, A2, A3, A4, A5
B0, B1, B2, B3, B4, B5
LETTER, LEGAL, TABLOID, LEDGER
INDEX_3X5, INDEX_4X6, INDEX_5X8
MONARCH, QUARTO
JIS_B4, JIS_B5
ROC_8K, ROC_16K
PRC_1, PRC_2, PRC_3, PRC_4, PRC_5
PRC_6, PRC_7, PRC_8, PRC_9, PRC_10, PRC_16K

Default: A4

Parameters #

htmlFilePath #

Path of the local HTML file.

printSize #

Paper size name. Use one of the supported values listed above.

orientation #

Use:

  • PORTRAIT
  • LANDSCAPE

marginLeft, marginTop, marginRight, marginBottom #

Margins in mils.

Note:

  • 1000 mils = 1 inch
  • 500 mils = 0.5 inch

startPage #

First page to export.

endPage #

Last page to export.

Use 0 for all pages.

dpi #

Output resolution.

Recommended values:

  • 300 for normal quality
  • 600 for high quality

Usage #

import 'dart:io';
import 'package:flutter/services.dart';
import 'package:path_provider/path_provider.dart';

final MethodChannel htmlChannel = MethodChannel('html_to_pdf');

Future<void> generatePdf() async {
  final tempDir = await getTemporaryDirectory();
  final htmlFile = File('${tempDir.path}/demo.html');

  await htmlFile.writeAsString('''
<!DOCTYPE html>
<html>
<head>
  <style>
    body {
      background: red;
      color: white;
      font-family: Arial;
      padding: 20px;
    }
    .box {
      border: 2px solid white;
      margin: 10px 0;
      padding: 10px;
    }
  </style>
</head>
<body>
  <h1>native_html_to_pdf Demo</h1>
  <p>This PDF is generated from HTML.</p>

  <div class="box">Block 1</div>
  <div class="box">Block 2</div>
  <div class="box">Block 3</div>

  <script>
    window.onload = function() {
      setTimeout(function() {
        if (window.AndroidBridge) {
          window.AndroidBridge.notifyPdfReady();
        }
      }, 500);
    };
  </script>
</body>
</html>
''');

  final String path = await htmlChannel.invokeMethod('convertHtmlToPdf', {
    'htmlFilePath': htmlFile.path,
    'printSize': 'A4',
    'orientation': 'PORTRAIT',
    'marginLeft': 0,
    'marginTop': 0,
    'marginRight': 0,
    'marginBottom': 0,
    'startPage': 1,
    'endPage': 0,
    'dpi': 600,
  });

  print('PDF saved at: $path');
}

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Metadata

Convert local HTML files into high-quality PDFs using native Android and iOS engines with full control over page size, margins, orientation, and DPI.

Repository (GitHub)
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License

unknown (license)

Dependencies

flutter, plugin_platform_interface

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