Firebase Authentication Limits

The following auth operations have limitations on the frequency you can perform them. These limitations can change without notice. Contact Firebase support to discuss special use cases.

Account creation and deletion limits

Operation	Limit
New account creation	100 accounts/IP address/hour
Account deletion	10 accounts/second

Note: You can schedule a temporary increase to the account creation limit in the Firebase console

Accounts per project

Account type	Limit
Anonymous user accounts	100 million
Registered user accounts	Unlimited

Email limits

Operation	Spark plan limit	Blaze plan limit
Address verification emails	1000 emails/day	100,000 emails/day
Address change emails	1000 emails/day	10,000 emails/day
Password reset emails	150 emails/day	10,000 emails/day
Email link sign-in emails	2000 emails/day	25,000 emails/day

Email link generation limits

Operation	Spark plan limit	Blaze plan limit
Address verification links	10,000 emails/day	1,000,000 emails/day
Password reset links	1500 emails/day	100,000 emails/day
Sign-in links	20,000 emails/day	250,000 emails/day

Phone number sign-in limits

Operation	Limit
User sign-ins	1600/project/minute, as well as the pricing and limits specified on the Pricing page
Verification code SMS messages	50 messages/IP address/minute, 500 messages/IP address/hour, 1500 messages/project/minute
Verification requests	150 requests/IP address/hour

API limits

Operation	Limit
Operations per service account	500 requests/second
Operations per project	1000 requests/second, 10 million requests/day