Hi Im trying apply watermark to PDF in C# and i have confusion between Font Size and Zoom Number
please help me what is use of Zoom Number and value range aslo i have font size then zoom number is required.
The Zoom Number in Aspose.PDF refers to the initial display magnification of the PDF document when opened in a viewer, such as Adobe Reader. It does not affect the font size or appearance of a watermark on the page . The zoom value typically ranges from 0 to 1000, where 100 represents 100% (normal view), 50 is zoomed out, and 200 is zoomed in. This setting is part of the document’s display preferences and is unrelated to watermark formatting [3, 5].
When applying a watermark in C#, the font size controls the visual size of the watermark text on the page. The zoom number is not required for this purpose and should not be used to adjust text size or layout. You can apply a watermark without modifying the zoom level — it is optional and only affects how the document is initially displayed [2, 3].
Note that there have been reports of unexpected zoom behavior affecting layout during operations like merging PDFs. One such issue (PDFNET-57163) was resolved in Aspose.PDF 24.7, so using an updated version may help avoid rendering issues when working with multiple documents [4, 5].
Recommendation:
- Use font size to control watermark text appearance.
- Only set the zoom number if you need to control the initial view of the PDF.
- Consider updating to Aspose.PDF 24.7 or later if you are merging files or encountering layout distortions .
Let us know if you’re using TextStamp, Stamp, or image-based watermarks, so we can provide a targeted code example.