Illustrates how to upload multiple files to Amazon S3 using an HTML file input tag, Python, Flask and Boto
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s3multifile By Steve Saporta Apr 25 2014

Illustrates how to upload multiple files to Amazon S3 using:

  • An HTML file input tag
  • Python
  • Flask
  • Boto

To run this program, you'll need:

  • Python 2.7 (Boto doesn't work with 3.3
  • Flask (I used pip install flask to get the latest version)
  • Boto (A Python interface to Amazon Web Services)
  • An AWS account

You'll need an AWS bucket and AWS user with appropriate permissions.

  1. In S3, create a bucket. We'll assume it's named mybucket.
  2. Go to the bucket's properties and expand Permissions.
  3. Add a new grantee, selecting Authenticated Users and checking the box for Upload/Delete.
  4. In IAM, add a user. From the Permissions tab, attach a User Policy, similar to this one (your Sid will be different):
"Version": "2012-10-17",
  "Statement": [
      "Sid": "Stmt1396533377000",
      "Effect": "Allow",
      "Action": [
      "Resource": [

From the *Security Credentials" tab, create an Access Key. Take note of the Access Key ID and Secret Access Key. Set the following environment variables:

  • AWS_ACCESS_KEY_ID=[your Access Key ID]
  • AWS_SECRET_ACCESS_KEY=[your Secret Access Key]

Now use Python 2.7 to launch In your web browser, visit http://localhost:8080. Select some files and click *Submit. The files should appear in your S3 bucket!