Auth0 Support Center - Bulk Import

Bulk Import - Payload Limit

Sep 10, 2025

Overview

When bulk importing users to Auth0, the 500kB limit applies, according to the document Create users JSON file . This article explains if payload limit exceptions can be granted while performing a bulk upload.

Solution

The 500kB limit is a hard limit and cannot be increased.

It is necessary to start multiple imports if the data exceeds this size, so they can be imported separately. It is best practice to automate splitting the users into files and also import them and wait for imports to finish.

Additionally, there is a concurrent job limit as well as described here: Concurrent import jobs.

This means they will be able to import at most 2 files at the same time and will need to wait until they are finished before starting new import jobs.