AWS S3 Pre-Signed URLs Explained Simply | How to Use AWS S3 Pre-Signed URLs for Secure Access

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What are AWS S3 Pre-Signed URLs?

Imagine you have a private file in an S3 bucket that you want to share with someone securely. Normally, you’d have to make the file public, which is risky. AWS S3 Pre-Signed URLs allow you to grant temporary access to specific files without changing your bucket’s privacy settings.

Why Use Pre-Signed URLs?

They are the gold standard for secure, temporary file sharing because:

• Security: Only people with the unique link can access the file.
• Time Control: You decide exactly how long the link stays active (minutes or hours).
• Privacy: Your bucket remains 100% private.
• Upload/Download: You can create links for both getting files and putting new files into your bucket.

How to Create One in the AWS Console

1. Go to your S3 Bucket and select the file (object).
2. Click on the Object Actions dropdown menu.
3. Select Share with a pre-signed URL.
4. Set the Time Interval (e.g., 2 minutes or 1 hour).
5. Click Create pre-signed URL and copy your link!

Using the AWS CLI

For those who prefer the command line, you can generate a URL in seconds:

aws s3 presign s3://your-bucket-name/file-name --expires-in 3600

*This creates a URL valid for 1 hour (3600 seconds).

Want the Code?

Check the YouTube video description for the PowerPoint presentation and Java source code used in this tutorial!