Phileas — The Open Source PII and PHI redaction engine

The Philterd Team

December 17, 2025

Phileas — The Open Source PII and PHI redaction engine

I am delighted to announce the project that provides the core PII and PHI redaction capabilities is now open source! Introducing Phileas, the PII and PHI redaction engine! Phileas is now available under the Apache license on GitHub.

Philter  uses Phileas to identify and redact sensitive information like PII and PHI. Phileas does all of the heavy lifting, while Philter makes its functionality user-friendly and provide the NLP models.

Everyone is welcome to look at the code, use it, and contribute! In the next few weeks we will be adding better developer documentation to help you utilize Phileas in your applications. For the past 5 years, Phileas was only an internal project used by Philter, so please hang with us while we smooth out the edges and add user-facing documentation!

We decided to open source Phileas because, firstly, we believe in open source. We also want to give our users the ability to look into how Philter and Phirestream work. Identifying and redacting sensitive information is a challenge with important implications! We want our users to have a better understanding of how these products work and to have a more open line of communication as to what features are implemented next. In that regard, we will be migrating our tasks over from our private Jira to GitHub issues in the next few days as well.

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