Amazon S3 Presigned URLs Uploads and Downloads Tutorial

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Learn how to use Amazon S3 Presigned URLs in .NET to securely upload and download files directly from S3. In this tutorial, I’ll walk you through generating presigned URLs with the AWS SDK, handling uploads and downloads, and avoiding common mistakes like missing headers.

🔑 What you’ll learn in this video:

Why presigned URLs are better than exposing your S3 bucket
How to generate presigned PUT URLs for uploads
How to generate presigned GET URLs for downloads
Setting the correct Content-Type header
Real-world usage in a .NET application

This approach gives you fast, secure file handling without routing large files through your backend API.

Grab the source code from GitHub: https://github.com/m-jovanovic/aws-tu...

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Chapters
0:00 How Pre-Signed URLs work
3:25 Creating your S3 Bucket
5:02 Getting Pre-Signed URLs in .NET
8:57 Uploading to S3 with Pre-Signed URLs
12:47 Downloading objects from S3