---
updatedAt: 2026-05-20T21:09:40.000Z
agentTools:
  projectIndex: https://docs.developers.convert.com/llms.txt
---

# Client Authentication

The Convert API supports three authentication methods for client requests. Choose the one that matches your integration:

* **[API Key Authentication](/reference/api-key-authentication)** — HMAC request signing or Bearer token. Recommended for server-side integrations.
* **[Cookie Authentication](/reference/cookie-authentication)** — session-based. Used by Convert's own frontend and first-party integrations; not available to third-party clients.
* **[OAuth Authorization](/reference/oauth-authorization)** — delegated access for third-party OAuth clients.