During PDF → PNG conversion, the browser:
- Loads the PDF as a binary stream
- Renders each page to an off-screen canvas
- Converts the canvas bitmap into a PNG blob
- Triggers download of the final file
This process is extremely fast because it uses GPU acceleration when available.
If you want to see this in action, tools like https://pdftopng.io
provide a practical demonstration of real-time browser rasterization.
It’s a great example of how Canvas and PDF.js work together under the hood.
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