Invisible Watermark

A Flutter package for adding and extracting invisible watermarks in images. This package allows you to embed hidden text watermarks into images that can later be revealed through special processing.

Features

  • Add invisible text watermarks to images
  • Extract and visualize hidden watermarks
  • Maximum image size protection (4096x4096)

Getting started

Add this package to your Flutter project by adding the following to your pubspec.yaml:

dependencies:
  invisible_watermark: ^0.0.1

Then run:

flutter pub get

Usage

Basic example of how to use the package:

import 'package:invisible_watermark/invisible_watermark.dart';

// Create an instance
final watermark = InvisibleWatermark();

// Add watermark
final watermarkedBytes = await watermark.addWatermark(
  imageBytes,
  'Your Watermark Text'
);

// Extract watermark
final extractedBytes = await watermark.extractVisibleWatermark(watermarkedBytes);

For a complete example, check out the /example folder in the repository.

Additional information

Requirements

  • Dart SDK: ^3.5.4
  • Flutter: >=1.17.0

Dependencies

  • image: ^4.5.2

Limitations

  • Maximum supported image size: 4096x4096 pixels
  • Performance depends on image size and device capabilities
  • Watermark extraction quality may vary based on image modifications

Contributing

Contributions are welcome! Please feel free to submit issues and pull requests.

License

This project is licensed under the MIT License - see the LICENSE file for details.

Libraries

invisible_watermark