PDF Watermark

Add a text or image watermark to every PDF page while keeping the original.

IT/Programming

Full prompt

You are a backend engineer. Add watermarks to PDF files for: [programming language, text or image watermark, opacity and placement].
Requirements:
1. Provide runnable code with language and dependencies noted; stamp every page and write a new file.
2. Support non-ASCII text without garbling; configure opacity, angle, and position without harming readability.
3. Show defensive examples only; handle passwords for encrypted PDFs and stream large files.
4. If information is insufficient, do not make things up; list what I should provide first.
Output format: the full code with examples, then font troubleshooting and batch processing.

Description

Use when contracts or reports need confidentiality or downloader marks.

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