---
title: "Migrate from Firebase Auth"
description: "Step-by-step guide to migrating existing Firebase Authentication users to AuthSetu without password resets."
order: 1
category: "Guides"
updated: "2026-10-13"
---

# Migrate from Firebase Auth

Migrating from Firebase Authentication to AuthSetu can be completed without disrupting active users or requiring forced password resets.

## Migration Strategies

1. **Scrypt Hash Import**: Export users using the Firebase CLI (`firebase auth:export`) and upload them via `/v1/users/import`. AuthSetu supports verifying legacy Firebase modified scrypt hashes.
2. **Lazy Migration / Dual-Check**: When a user signs in, if they do not yet exist in AuthSetu, authenticate them against Firebase, create their account in AuthSetu, and upgrade their password hash to Argon2id.
3. **Session Interceptor**: Redirect active Firebase tokens to AuthSetu's token exchange endpoint for zero-friction cutover.