PDF4me

Overview

This node operation "Add Image Watermark To Image" allows users to add a watermark image onto another image. It supports multiple ways of providing both the input image and the watermark image, including binary data from previous nodes, base64 encoded strings, or URLs. Users can customize the watermark's position, opacity, rotation, and offsets, enabling flexible watermark placement.

Common scenarios where this node is beneficial include:

• Branding images by adding company logos as watermarks.
• Protecting images from unauthorized use by overlaying a watermark.
• Batch processing images to apply consistent watermarking for marketing or publishing.

Practical example: A user has product photos and wants to add their logo as a semi-transparent watermark in the bottom right corner before publishing them online.

Properties

Output

The node outputs the watermarked image as binary data under a specified binary property (usually named data or similar). The output includes:

• json: Metadata about the processed image (e.g., filename).
• binary: The actual image file with the watermark applied, ready for further processing or saving.

If the input was binary data, the output will be binary data representing the new image with the watermark applied.

Dependencies

• This node requires no external API keys or services; it processes images internally.
• It depends on upstream nodes or inputs providing image data either as binary, base64 strings, or accessible URLs.
• For URL inputs, the node must have internet access to fetch images.
• No special environment variables are required.

Troubleshooting

• Common issues:

  • Providing incorrect binary property names may cause the node to fail to find the input image or watermark.
  • Invalid base64 strings or inaccessible URLs will result in errors fetching or decoding images.
  • Using very large images without async processing might lead to timeouts or memory issues.
  • Incorrect position or offset values may place the watermark outside the visible area.

• Error messages and resolutions:

  • "Input binary property not found": Verify the binary field name matches the incoming data.
  • "Failed to load image from URL": Check the URL is correct and accessible.
  • "Invalid base64 content": Ensure the base64 string is properly formatted and complete.
  • Timeout or memory errors: Enable "Use Async Processing" to handle large files more efficiently.

Links and References

• n8n Documentation on Working with Binary Data
• Image Watermarking Concepts
• Base64 Encoding Explained