Question

How can I set a bucket in Amazon S3 so all the files are publicly read-only by default?

Answer 1

You can set a bucket policy as detailed in this blog post:

http://ariejan.net/2010/12/24/public-readable-amazon-s3-bucket-policy/

---

As per @robbyt’s suggestion, create a bucket policy with the following JSON:

{
    "Version": "2008-10-17",
    "Statement": [
        {
            "Sid": "AllowPublicRead",
            "Effect": "Allow",
            "Principal": {
                "AWS": "*"
            },
            "Action": [
                "s3:GetObject"
            ],
            "Resource": [
                "arn:aws:s3:::bucket/*"
            ]
        }
    ]
}

Important: replace bucket in the Resource line with the name of your bucket.