I needed to convert 500 product images from one format to another. Server-based solutions quoted...
I needed to convert 500 product images from one format to another. Server-based solutions quoted $15-50/month for batch processing. So I built a client-side solution using Web Workers and OffscreenCanvas.
The Architecture
The key insight: Canvas operations on large images block the main thread. The fix:
Web Workers handle image decoding/encoding off the main thread
OffscreenCanvas renders without DOM access — perfect for worker contexts
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