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Let's Encrypt vs Private CA for Internal Websites ?
The fundamental difference is who establishes trust.
Let's Encrypt is a publicly trusted Certificate Authority. Devices generally trust its certificates without the organization installing an internal CA.
A Private CA is controlled by the organization. Authorized devices are configured to trust the organization's CA.
For internal websites, both can provide HTTPS encryption and server authentication.
| Let's Encrypt | Private CA | |
|---|---|---|
| Public trust | Yes | No |
| Internal hostnames | Limited | Yes |
| Private IP addresses | Subject to current IP-certificate rules | Yes |
| CT visibility | Public certificates are logged | No public CT requirement |
| Internet dependency | Yes for public issuance/validation | Can operate internally |
| Trust control | Public CA ecosystem | Organization controlled |
Let's Encrypt can be a practical choice when automatic public trust and existing public-domain infrastructure are important.
A Private CA can be appropriate when an organization wants controlled trust, internal naming, private IP certificates or greater independence from public infrastructure.
In short: Neither is universally better. The appropriate choice depends on whether the application needs public Web PKI trust or controlled organizational trust.
Related: Can I Use Let's Encrypt for Internal Websites?
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