---
title: Upload a certificate bundle with an RSA and ECDSA certificate per custom hostname
description: Upload a certificate bundle with an RSA and ECDSA certificate per custom hostname
image: https://developers.cloudflare.com/changelog-preview.png
---

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## Upload a certificate bundle with an RSA and ECDSA certificate per custom hostname

Feb 14, 2025 

[ SSL/TLS ](https://developers.cloudflare.com/ssl/) 

Cloudflare has supported both RSA and ECDSA certificates across our platform for a number of years. Both certificates offer the same security, but ECDSA is more performant due to a smaller key size. However, RSA is more widely adopted and ensures compatibility with legacy clients. Instead of choosing between them, you may want both – that way, ECDSA is used when clients support it, but RSA is available if not.

Now, you can upload both an RSA and ECDSA certificate on a custom hostname via the API.

```
curl -X POST https://api.cloudflare.com/client/v4/zones/$ZONE_ID/custom_hostnames \    -H 'Content-Type: application/json' \    -H "X-Auth-Email: $CLOUDFLARE_EMAIL" \    -H "X-Auth-Key: $CLOUDFLARE_API_KEY" \    -d '{    "hostname": "hostname",    "ssl": {        "custom_cert_bundle": [            {                "custom_certificate": "RSA Cert",                "custom_key": "RSA Key"            },            {                "custom_certificate": "ECDSA Cert",                "custom_key": "ECDSA Key"            }        ],        "bundle_method": "force",        "wildcard": false,        "settings": {            "min_tls_version": "1.0"        }    }}’
```

You can also:

* [Upload](https://developers.cloudflare.com/api/resources/custom%5Fhostnames/methods/create/) an RSA or ECDSA certificate to a custom hostname with an existing ECDSA or RSA certificate, respectively.
* [Replace](https://developers.cloudflare.com/api/resources/custom%5Fhostnames/subresources/certificate%5Fpack/subresources/certificates/methods/update/) the RSA or ECDSA certificate with a certificate of its same type.
* [Delete](https://developers.cloudflare.com/api/resources/custom%5Fhostnames/subresources/certificate%5Fpack/subresources/certificates/methods/delete/) the RSA or ECDSA certificate (if the custom hostname has both an RSA and ECDSA uploaded).

This feature is available for Business and Enterprise customers who have purchased custom certificates.

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```