Vue 3 and pdf-lib Enable Fully Browser-Based PDF Watermarking Tool

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A developer has detailed how to build a browser-based PDF watermarking tool using Vue 3, pdf-lib, and PDF.js, processing files entirely on the user's device without server uploads. The approach addresses privacy concerns associated with traditional watermark tools that send potentially sensitive documents to remote servers. The implementation covers text rendering, rotation correction, and multi-page support, including a mathematical fix to center rotated text accurately on each page. Configurable options such as font size, opacity, rotation angle, color, and page range are supported to suit different use cases. The full source code is available on GitHub, and the post notes that image-based watermarks using PNG logos would require a separate approach beyond pdf-lib's built-in text drawing methods.

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