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ludy.dev

Posted on • Originally published at billinggenerator.com

Under the Hood: Building a 100% Client-Side PDF Invoice Engine in the Browser

This simple function automatically resolves the correct localized currency symbol, decimal separator, and positioning based on the user's browser settings. It keeps the bundle under 45kb gzipped and offloads processing to the browser engine.

Tackling the iOS Safari Canvas Limits

If you have ever done client-side PDF generation, you know mobile Safari is where dreams go to die. iOS has strict memory limits on HTML5 canvases. If the canvas exceeds these limits, Safari silent-crashes and reloads the page.

To bypass this, I optimized the document generation flow. The app strips out unnecessary CSS layers, hidden DOM nodes, and heavy SVG elements prior to rendering the canvas footprint. It then processes the canvas in memory segments, ensuring smooth execution even on older mobile devices.

The tool is completely free and active at billinggenerator.com. If you have built client-side document generators before, I would love to hear how you handled print margins and multi-page splits in the comments below!

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