Privacy FAQ

Answers to common questions about Langfuse’s privacy practices.

Do you use customer data to train AI models?

No. Langfuse does not train or fine‑tunes ML/LLM models on Client Data. See terms of service for more details.

Can we enter into a Data Processing Agreement (DPA)?

Yes. You can enter into a DPA with Langfuse.

How long is data retained?

Data retention can be defined via project‑level policies: ≥ 3 days up to unlimited. Data is purged nightly.

How can we delete data?

Customers can delete single traces, batches, projects, organisations, or user accounts via the UI or the public API. See data deletion documentation for more details.

How do you delete data after the End of the Contract?

Upon termination, Langfuse will return or destroy Client Data within 30 days. If return or destruction is required or infeasible, Langfuse will continue to protect Client Data and limit further uses and disclosures.