---
type: concept
title: PEM Bundle
tags: [pki, file-formats, certificates]
related: [serverzertifikate, harica]
created: 2026-06-30
updated: 2026-06-30
sources: ["output/rz_uni_greifswald_de_dienste_allgemein_dfn_pki_zertifikate_serverzertifikate_har.md"]
---

# PEM Bundle

A **PEM bundle** is a certificate download format that aggregates the requested server certificate along with the full certificate chain (intermediate certificates).

## Importance
The [[universitatsrechenzentrum-urz]] recommends the PEM bundle format for server certificates because it ensures that the client (e.g., a web browser) can verify the entire chain of trust back to the root CA, preventing "untrusted certificate" warnings.