When a PDF document is watermarked, by default, it's incrementally updated. Changes are appended to the end of the document, leaving the original content intact. When a small change is applied to a large document, then it can be saved quickly. But the resulting file will be bigger in size.
- If incremental updating is disabled, then the process is slower, but the resulting file will be smaller.
- If incremental updating is enabled, then the process is faster, but the resulting file will be bigger.
Incremental updates for PDF documents when watermarking can be disabled by adding the following entry in the configuration file of the conversion service:
<add key="Watermark.DisableIncrementalUpdate" value="true" />