Why WeasyPrint Fails with JavaScript-Heavy HTML and How to Work Around It

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WeasyPrint, a popular Python library for converting HTML to PDF, does not execute JavaScript, causing dynamic elements like Chart.js graphs to render as blank spaces in output documents. This limitation affects any HTML that relies on client-side rendering, including modern frameworks and dynamically injected content. A practical workaround involves sending HTML to a third-party API such as html2img, which uses a full browser engine to render JavaScript before returning the PDF. The API-based approach eliminates the need for system-level dependencies like Pango or Chromium, making it portable across environments including Docker containers and AWS Lambda. WeasyPrint remains the recommended option for static, offline, or policy-restricted use cases requiring fine-grained CSS paged media control.

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