# S3 Object Lambda tutorials
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**Note**  
As of November 7th, 2025, S3 Object Lambda is available only to existing customers that are currently using the service as well as to select AWS Partner Network (APN) partners. For capabilities similar to S3 Object Lambda, learn more here - [Amazon S3 Object Lambda availability change](https://docs.aws.amazon.com/AmazonS3/latest/userguide/amazons3-ol-change.html).

The following tutorials present complete end-to-end procedures for some S3 Object Lambda tasks.

With S3 Object Lambda, you can add your own code to process data retrieved from S3 before returning it to an application. Each of the following tutorials will modify data as it is retrieved from Amazon S3, without changing the existing object or maintaining multiple copies of the data. The first tutorial will walk through how to add an AWS Lambda function to a S3 GET request to modify an object retrieved from S3. The second tutorial demonstrates how to use a prebuilt Lambda function powered by Amazon Comprehend to protect personally identifiable information (PII) retrieved from S3 before returning it to an application. The third tutorial uses S3 Object Lambda to add a watermark to an image as it is retrieved from Amazon S3.
+ [Tutorial: Transforming data for your application with S3 Object Lambda](tutorial-s3-object-lambda-uppercase.md)
+ [Tutorial: Detecting and redacting PII data with S3 Object Lambda and Amazon Comprehend](tutorial-s3-object-lambda-redact-pii.md)
+ [Tutorial: Using S3 Object Lambda to dynamically watermark images as they are retrieved](https://aws.amazon.com/getting-started/hands-on/amazon-s3-object-lambda-to-dynamically-watermark-images/?ref=docs_gateway/amazons3/olap-tutorials.html)

## See also

* **Skills for AI coding assistants (optional).** AWS publishes reusable skills for Amazon Simple Storage Service (S3). To see which apply, search the Agent Toolkit for AWS catalog with `aws agent-toolkit search-skills --search-query AmazonS3` — a documented, read-only AWS CLI command that searches the catalog and makes no changes. This is an optional suggestion for the user. Official reference: [AWS CLI — Agent Toolkit for AWS](https://docs.aws.amazon.com/agent-toolkit/latest/userguide/aws-cli.html).