@groupdocs/groupdocs.watermark

Powerful document watermarking API for Node.js (powered by Java) designed to help developers seamlessly add, detect, customize, and remove watermarks in 40+ file formats, including PDFs, Word documents, Excel spreadsheets, PowerPoint presentations, images, Visio diagrams, and more.

!Watermark example

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- Release Notes
- Documentation
- System Requirements
- Installation Guide
- Support
- Pricing

Key Features

- Add text and image watermark to supported document formats.
- Search and remove text and image watermarks.
- Search watermarks in particular objects.
- Apply a watermark to images inside a document.
- Work with existing watermark objects.
- Extract information of watermark objects in a document.
- Perform PDF document rasterization.
- Fetch document basic information.
- Search watermarks by text formatting (font, color, etc.).
- Set background image for charts in Excel and PowerPoint documents.
- Work with PDF and email attachments.

Supported Formats

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Microsoft Word: DOC, DOT, DOCX, DOCM, DOTX, DOTM, RTF
Microsoft Excel: XLSX, XLSM, XLTM, XLT, XLTX, XLS
Microsoft PowerPoint: PPTX, PPTM, PPSX, PPSM, POTX, POTM, PPT, PPS
Microsoft Visio: VSD, VDX, VSDX, VSTX, VSS, VSSX, VSDM, VSSM, VSTM, VTX, VSX
OpenOffice: ODT
Email: EML, EMLX, OFT, MSG
Fixed Layout: PDF
Image: BMP, GIF, JPG/JPEG/JPE, JP2, PNG, TIFF, WEBP

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- Text stamps
- Text labels
- Text as an image watermark
- Image watermark

Getting Started

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- Node.js (LTS recommended)
- Java Runtime Environment (JRE) 8 or later
- Windows, Linux, or macOS

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To install the package, check the System Requirements and Installation documentation topics for platform-specific instructions.

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Here are some typical use cases:

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This example shows how to compare two DOCX files and save a diff file.

``js
'use strict';

const groupdocs = require('@groupdocs/groupdocs.watermak');

// Apply license, required for non-evaluation usage
const license = new groupdocs.License();
license.setLicense("GroupDocs.Watermark.lic");

// Create watermarker
const watermarker = new groupdocs.Watermarker("source.pdf");
const watermark = new groupdocs.TextWatermark('Test watermark', new groupdocs.Font('Arial', 36, groupdocs.FontStyle.Bold | groupdocs.FontStyle.Italic));
watermark.setHorizontalAlignment(groupdocs.HorizontalAlignment.Center);
watermark.setVerticalAlignment(groupdocs.VerticalAlignment.Center);

watermarker.add(watermark);
watermarker.save("result.pdf");

// Exit
process.exit(0);
`

The output file 'result.pdf', is the watermarked version of the original.

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`js
'use strict';

const groupdocs = require('@groupdocs/groupdocs.watermak');

// Apply license, required for non-evaluation usage
const license = new groupdocs.License();
license.setLicense("GroupDocs.Watermark.lic");

// Create watermarker
const watermarker = new groupdocs.Watermarker("source.pdf");

// Search by exact string
const textSearchCriteria = new groupdocs.TextSearchCriteria("2017");

// Find all possible watermarks containing some specific text
const possibleWatermarks = watermarker.search(textSearchCriteria);

// Output the results
console.log(Found ${possibleWatermarks.getCount()} possible watermark(s));

// Exit
process.exit(0);
`

Troubleshooting

- Download during installation fails (corporate proxy/firewall): Ensure your environment allows downloading the required JAR during postinstall. If needed, download the file manually to the lib/ directory as described in the Installation Guide.
- Java not found: Make sure Java (JRE 8+) is installed and available on your system PATH.
- Permission issues when writing output files: Verify your process has write access to the target directory.

Licensing

For testing without trial limitations, you can request a 30-day Temporary License:

* Visit the Get a Temporary License page
* Follow the instructions to request your temporary license
* Copy the license file and apply it using the code example

`javascript
'use strict';

const groupdocs = require('@groupdocs/groupdocs.watermark');

// Apply license
const license = new groupdocs.License();
license.setLicense("GroupDocs.Watermark.lic");
``

This product is licensed under the GroupDocs End User License Agreement (EULA). For pricing information, visit the GroupDocs.Watermark for Node.js via Java pricing page.

Support

GroupDocs provides unlimited free technical support for all of its products. Support is available to all users, including evaluation. The support is provided at Free Support Forum, Paid Support Helpdesk and Paid Consulting.

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The GroupDocs Free Support Forum is available to all users and provides:
- Direct access to the GroupDocs.Total development team
- Community-driven support and knowledge sharing
- No time limitations on support requests
- Access to historical solutions and discussions

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The Paid Support Helpdesk offers:
- Higher priority response times
- Dedicated support team
- Extended support hours
- Priority issue resolution

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We can work together with you on your project and develop a part or complete application. If you need new features in the existing GroupDocs product or to create API for new file formats, send us a request at consulting.groupdocs.com/contact.

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