How to Build a Browser-Based PDF Watermark Tool Using JavaScript
freeCodeCamp.org1670 字 (约 7 分钟)
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This tutorial demonstrates how to add PDF watermarks directly in the browser using JavaScript and the PDF-lib library without a backend, supporting text/image watermarks, adjustable opacity/rotation, page selection, positioning controls, and direct PDF download.
入选理由：使用PDF-lib库可在浏览器端直接处理PDF，实现水印添加，无需后端服务器。
FeaturedArticle#JavaScript#PDF Processing#Client-Side Development#PDF-lib英文