What is a CSR and why do I need to decode it?

A Certificate Signing Request (CSR) is a file containing your public key and identity information sent to Certificate Authorities to obtain SSL certificates. Decoding it helps you verify that all the details—domain names, organization info, and key specifications—are correct before the CA processes your certificate request, preventing errors and delays.

Is it safe to paste my CSR into CSR Decoder?

Yes, absolutely. CSR Decoder processes everything on your client-side (in your browser) with zero data transmission to external servers. Your CSR information is never logged, stored, or transmitted anywhere, making it completely safe for handling sensitive certificate details.

Can CSR Decoder validate wildcard and multi-domain certificates?

Yes, CSR Decoder fully supports decoding and validating wildcard certificates (*.example.com) and multi-domain certificates with multiple Subject Alternative Names (SANs). It displays all domains included in your CSR so you can verify everything is correct before purchase.

What information does CSR Decoder display from my CSR?

CSR Decoder extracts and displays the Common Name (CN), Subject Alternative Names (SANs), organization name, country, state, locality, key size (2048-bit, 4096-bit, etc.), signature algorithm (SHA-256, SHA-384, etc.), and the public key details in an easy-to-read format.

Can I use CSR Decoder if I already have an SSL certificate?

CSR Decoder is specifically designed for decoding Certificate Signing Requests. If you need to check details of an already-issued SSL certificate, you'll want to use a certificate decoder tool instead. However, you can use CSR Decoder to verify any CSRs you have for renewals or additional certificates.

CSR Decoder

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CSR Decoder

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