How to Migrate from Firebase to Supabase (2026 Guide)

Firebase is a fast way to ship, but many teams eventually hit its limits — the NoSQL data model, pricing at scale, and Google lock-in. Supabase, with its open-source Postgres backend, is the most common destination. Here's a practical guide to making the move in 2026.

Why migrate from Firebase to Supabase?

• A real SQL database. Supabase is built on PostgreSQL, so you get relations, joins, and full SQL instead of Firestore's NoSQL model.
• Open-source, no lock-in. Supabase is open-source and self-hostable, so you're not tied to one vendor.
• Predictable pricing. Many teams find Supabase's pricing easier to reason about than Firebase's usage-based costs at scale.
• Row-level security. Postgres RLS gives you powerful, database-level access control.

That said, migration is real work — don't switch just for novelty. Switch when Firebase's model is genuinely holding you back.

Before you start: plan the data model

The biggest conceptual shift is NoSQL to SQL. Firestore's collections and documents need to be re-modeled as relational tables with proper relationships. Spend time here first: map each collection to tables, decide on foreign keys, and normalize where it makes sense. A clean schema is the foundation of a smooth migration.

Step 1: Migrate the database

Export your Firestore data (via the Firebase CLI or Admin SDK), transform it to match your new relational schema, and import it into Supabase's Postgres. For small datasets, a script that reads Firestore and inserts into Supabase via its client or SQL works well. For larger ones, batch the export/transform/load and validate row counts and relationships after import.

Step 2: Migrate authentication

Supabase Auth supports email/password, magic links, OAuth providers, and more. You can export users from Firebase Auth and import them into Supabase. Password hashes can often be migrated (Firebase uses scrypt; plan for how you'll handle hashing so existing users can log in), or you can trigger password resets. Update your app's auth calls from the Firebase SDK to Supabase's.

Step 3: Migrate storage

Move files from Firebase Storage to Supabase Storage by downloading from one and uploading to the other (a script using both SDKs), then update the file references/URLs in your database. Recreate any access rules using Supabase Storage policies.

Step 4: Migrate functions and security rules

Firebase Cloud Functions become Supabase Edge Functions (Deno-based) or Postgres functions/triggers, depending on the logic. Firestore security rules translate into Postgres row-level security policies — a powerful but different model, so budget time to get RLS right.

Step 5: Update your app and test

Swap the Firebase SDK calls for Supabase's client library across your app, then test thoroughly: auth flows, reads/writes, storage, and permissions. Consider running both in parallel briefly, or migrating in stages, to reduce risk.

Things to watch out for

• Real-time differences. Both support realtime, but the APIs differ — re-implement listeners with Supabase Realtime.
• Password migration. Plan how existing users will authenticate (hash migration vs resets).
• RLS is not optional. Get row-level security right, or you risk exposing data.
• Test with real data. Validate counts, relationships, and edge cases before cutover.

Frequently asked questions

Is it hard to migrate from Firebase to Supabase?

The main challenge is re-modeling NoSQL data into SQL tables and translating security rules to row-level security. With a clear schema and a staged plan, it's very doable, and tooling and guides exist to help.

Can I keep my users' passwords when migrating?

Often yes — you can migrate password hashes so users log in seamlessly, though it requires care. Alternatively, prompt users to reset their passwords after migration.

Should I move from Firebase to Supabase?

Migrate if you need SQL, open-source flexibility, or more predictable pricing, and Firebase's model is limiting you. If Firebase works well for your app, there's no urgency to switch.

The bottom line

Migrating from Firebase to Supabase is mostly about one big shift — NoSQL to SQL — plus moving auth, storage, and functions. Plan the schema first, migrate in stages, and get row-level security right, and you'll gain a powerful Postgres backend you own. If you're still weighing options, see our guides to the best Firebase alternatives and best Supabase alternatives.