ENGINEERING NOTEJune 15, 20241 min read

Handling File Uploads at Scale with S3 Presigned URLs

Bypassing server bottlenecks by allowing client browsers to upload direct to S3 using secure, timed signatures.

Processing image uploads directly on primary web servers consumes memory and clogs network bandwidth. Presigned URLs delegate direct S3 uploads.

We walk through requesting presigned URLs, uploading assets with custom fetch payloads, and checking file dimensions on completion.

WRITTEN BY

Full Stack & AI Engineer crafting high-performance web applications and intelligent machine learning systems.