Running compute at the edge means you can transform and optimize content before it reaches your users — with sub-millisecond cold starts and no additional infrastructure. Every FastEdge worker runs on WebAssembly, providing sandboxed, predictable performance across all edge locations.
This post explores Dynamic Image Watermarking at the Edge — a capability that demonstrates the power of edge computing for content transformation.
The Idea
Apply watermarks to images on-the-fly at the edge — dynamic, per-request watermarking without pre-processed assets.
By processing at the edge, you eliminate round-trips to origin servers for transformation workloads. A user requesting content in Tokyo gets it processed at the Tokyo PoP, not at a central server in Frankfurt or Virginia.
Implementation
Here is the core implementation pattern:
Performance Benefits
- Zero additional infrastructure — runs on the existing edge network, no servers to provision.
- Sub-millisecond cold starts — WebAssembly starts faster than any container-based solution.
- Process at the closest PoP — minimal latency regardless of user location.
- Offload origin servers — transformation happens at the edge, reducing compute costs by up to 80%.
Automatic scaling — the edge network scales with demand, no capacity planning needed.
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