crt
What is a .crt file?
application/x-x509-ca-cert
A .crt file holds an X.509 certificate, most often PEM-encoded (Base64 text) though sometimes DER binary. The extension is a convention for the public certificate half of a TLS identity, as opposed to the private .key file. It carries the subject, issuer, validity window, public key, and signature.
How to use a .crt file
Use an example .crt to test certificate parsers, trust-store importers, and TLS tooling, or as input for .crt-to-.pem/.der conversion. Sample material only, self-signed and clearly labelled.
Download example .crt files
- X.509 Certificate (.crt)The same self-signed certificate under the conventional .crt extension (PEM-encoded) — for testing trust-store importers and tools that key off the .crt extension. Sample only.
- X.509 Certificate (.crt) — Security SAMPLESame SAMPLE certificate as .crt (PEM bytes) for tools that expect the CRT extension.
- SAMPLE Root CA Certificate (PEM)The self-signed root of the Novus Examples SAMPLE certificate hierarchy (RSA-4096, CA:TRUE, no path-length limit). Install it as the only trust anchor to make the rest of this wave's chains verifiable in a sandbox. Fictional issuer — never a real identity.
- SAMPLE Intermediate CA Certificate (PEM)The issuing CA that signs every leaf in this wave, itself signed by the SAMPLE root and constrained with pathLenConstraint:0 so it cannot mint further CAs. Use it to test intermediate handling and path-length enforcement.