View CSR files in your browser
What you send a CA to get a certificate. Check the names and the key in one before you send it, right here. Nothing leaves your device.
Or drop it anywhere on this page
What you'll see
Your certificate opens as a card: who it's for, who issued it, its dates and its chain.
- Its chain • Checked against the roots Filepeek carries
- Valid from and until • The days it has
- Every name it covers • Domains and emails
- SHA-256 and SHA-1 fingerprints • Copy with a click
About CSR
A CSR, set out by RSA Laboratories as PKCS #10, is how a server or a person asks a CA for a certificate. OpenSSL, IIS, cPanel and Kubernetes make them, and the CA copies what one asks for into the certificate it signs.
It holds the subject, often the names the certificate should cover, the public key and what that key should be used for, signed with the matching private key to prove the asker holds it. The private key stays behind.
Filepeek shows the subject, every name it asks for, the key's kind and size, its fingerprint and the extensions it requests, and checks its signature, so a typo shows before a CA signs it.
Certificate signing request
.csr • .req
Format
- MIME type
- application/pkcs10
- Made by
- RSA Laboratories
- Released
- 1993
Inside the file
- Asks for
- A certificate for a name
- Holds
- The names, the public key, a signature
- Encoding
- Base64 text, or DER
- Standard
- PKCS #10
Opens in every browser
Browsers download CSR files or show them as text. Filepeek reads what one asks for in Chrome, Edge, Firefox and Safari.
- YouChromeOpens through Filepeek
- YouEdgeOpens through Filepeek
- YouFirefoxOpens through Filepeek
- YouSafariOpens through Filepeek
Questions
How do I check a CSR before sending it?
Drop it on this page or press Peek a CSR. Its subject, the names it asks for and its key show at once, so you can check them before your CA does.
Does a CSR hold my private key?
No. It holds only the public key, signed with the private one, which stays wherever the CSR was made.
Why doesn't it show the challenge password?
It's a secret, so Filepeek only says one is set.
Is my file uploaded?
No. The file opens inside your browser and never leaves your device.