Add a text or image watermark to PDF documents using Dart. Load the PDF document and insert the required watermark into it. Then save the result in a convenient format such as DOCX, PDF, MD, HTML, TXT, DOC, RTF, EPUB, XPS and more, and share the watermarked document with another person. Also remove the watermark from PDF document if the watermark was previously added to the document, and the reasons for adding are not longer relevant.
With this Dart/Flutter API, developers can add a watermark to PDF online. Just create the watermark using text or an image and then insert that watermark into your PDF document in Dart.
Note: there is no need to install any third party applications or libraries. Therefore, our Dart/Flutter software solution is very easy to use.
The given Dart/Flutter SDK is also helpful to remove watermarks from PDF. Removing a watermark in PDF means that you can load the desired PDF document stamped with a text or image watermark, remove this watermark from the PDF using Dart, and then save the output file in a convenient format – DOC, DOCX, PDF, JPEG, PNG, TIFF and others.
To evaluate how to add or remove a watermark in PDF with our Dart/Flutter API, load the PDF and the watermark as an image or text. Then select a convenient export file format – DOC, DOCX, PDF, HTML, RTF, XPS and others.
Use the following example to see how it works:
import 'package:aspose_words_cloud/aspose_words_cloud.dart';
final config = Configuration("####-####-####-####-####", "##################");
final wordsApi = WordsApi(config);
final requestDocument = (await File('Input1.pdf').readAsBytes()).buffer.asByteData();
final requestImageStream = (await File('Input2.jpg').readAsBytes()).buffer.asByteData();
final requestWatermarkData = WatermarkDataImage();
requestWatermarkData.image = FileReference.fromLocalFile(requestImageStream);
final insertWatermarkRequest = InsertWatermarkOnlineRequest(
requestDocument, requestWatermarkData);
final insertWatermarkResult = await wordsApi.InsertWatermarkOnline(
insertWatermarkRequest);
final convertRequest = ConvertDocumentRequest(
insertWatermarkResult.document.values.first, 'pdf');
await wordsApi.convertDocument(convertRequest);import 'package:aspose_words_cloud/aspose_words_cloud.dart';
final config = Configuration("####-####-####-####-####", "##################");
final wordsApi = WordsApi(config);
final requestDocument = (await File('Input.pdf').readAsBytes()).buffer.asByteData();
final requestWatermarkData = WatermarkDataText();
requestWatermarkData.text = 'This is the watermark text';
requestWatermarkData.layout = WatermarkDataText_LayoutEnum.diagonal;
final insertWatermarkRequest = InsertWatermarkOnlineRequest(
requestDocument, requestWatermarkData);
final insertWatermarkResult =
await wordsApi.InsertWatermarkOnline(insertWatermarkRequest);
final convertRequest = ConvertDocumentRequest(
insertWatermarkResult.document.values.first, 'pdf');
await wordsApi.convertDocument(convertRequest);import 'package:aspose_words_cloud/aspose_words_cloud.dart';
final config = Configuration("####-####-####-####-####", "##################");
final wordsApi = WordsApi(config);
final requestDocument = (await File('Input.pdf').readAsBytes()).buffer.asByteData();
final deleteWatermarkOnline = DeleteWatermarkOnlineRequest(requestDocument);
final deletedWatermark = await wordsApi.deleteWatermarkOnline(deleteWatermarkOnline);
final convertDocument = ConvertDocumentRequest(deletedWatermark.document.values.first, 'pdf');
await wordsApi.convertDocument(convertDocument);Clone Aspose.Words Cloud SDK for Dart source code from GitHub and use it in your project. Add this dependency to your pubspec.yaml: dependencies: aspose_words_cloud: 22.4.0
Please follow these Instructions to quickly get the necessary security credentials and access our REST API.
Refer to the Repository Documentation to see the details.
You can add a watermark to a document in other formats: