CSR viewer
To open a CSR file, drop it in the box below. It opens straight away, even with no extension or the wrong one. Your browser opens it on your device: nothing is uploaded.
What you see
| CSR in the viewer | |
|---|---|
| Read | PEM and DER |
| Requested | Alternative names, key usage, extended key usage and the other extensions |
| Signature | Checked against the request’s own key |
| Fingerprint | SHA-256 of the public key, to match it with its private key |
| Extensions | .csr, .req, .pem, .der |
| Upload | None: opened on your device |
What is a CSR file?
A CSR (certificate signing request, PKCS#10) is what you send a certificate authority to get a certificate: your name or domain, your public key and the extensions you ask for, signed with your private key.
The subject, the key type and size, the alternative names and other extensions requested, and whether the request’s signature was made by its own key. A challenge password is noted but not shown.
How to open a CSR file
- Add your CSR. Drop the file in the box, choose it or paste it.
- Look at it. The subject, the key type and size, the alternative names and other extensions requested, and whether the request’s signature was made by its own key. A challenge password is noted but not shown.
- Take it further. Open in hands it, in a new tab, to File converter.
Questions
Drop it here. The domain names, the key size and the extensions requested are listed before you pay for a certificate.
No. It holds the public key only; the private key stays with you.
No. The viewer runs in your browser and opens the file on your device. Nothing is sent anywhere.