.crt — Security Certificate
A public-key certificate file, typically used to verify identity for TLS/SSL connections or code signing.
Also known as: .cer
Contains cryptographic key, certificate, or credential material. Handle private keys and credentials carefully, and never share them with anyone you don't fully trust.
Check another filename
File extension lookup
Frequently asked questions
What is a .crt file?
A public-key certificate file, typically used to verify identity for TLS/SSL connections or code signing.
Can I edit a .crt file?
Not directly as text — .crt is a runnable or packaged format, not one meant for manual editing.
Does having a .crt extension mean the file is safe?
No single extension can guarantee that. Contains cryptographic key, certificate, or credential material. Handle private keys and credentials carefully, and never share them with anyone you don't fully trust. Always consider where the file came from, not just its name.