CSR Generator | Certificate Signing Request

CSR generator that creates a certificate signing request and private key in your browser. RSA or ECDSA keys, multiple SANs, wildcards and the openssl command.

Also known as: csr generator · csr generator online · generate csr online · certificate signing request generator · csr generator with private key · create csr for ssl certificate · ecdsa csr generator · wildcard csr generator · csr with subject alternative names · openssl csr command generator

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Certificate Request Details

Common name (CN)

Additional domains (SANs, one per line)The common name is always included as the first SAN. DNS names, wildcards and IP addresses are accepted.

Organization (O)

City (L)

State (ST)

Country (C)

Key type

CSR and Private Key

Equivalent OpenSSL Command

Enter a common name to see the openssl req command that creates the same key and CSR on your own server. The -addext flag needs OpenSSL 1.1.1 or later.

About CSR Generator

A CSR generator creates the certificate signing request and private key you need to order an SSL/TLS certificate from a certificate authority such as DigiCert, Sectigo or GoDaddy. Fill in the domain names and your company details, pick RSA or ECDSA, and paste the CERTIFICATE REQUEST block into the CA's order form. The key pair is made by your browser's Web Crypto API, so the private key never leaves this page.

Key Features

Builds a standard PKCS #10 request in PEM format that every public CA and ACME client accepts
Puts every domain in the Subject Alternative Name extension, with the common name added as the first SAN
RSA 2048, 3072 or 4096-bit keys signed with SHA-256, or ECDSA P-256 (SHA-256) and P-384 (SHA-384)
Wildcard (*.example.com) and IP address SANs, validated before the request is built
Shows the subject, SANs, key size and public key SHA-256 fingerprint of the request it just made
Prints the matching openssl req -new command, so you can create the same request on the server instead

Use Cases

Ordering a DigiCert or Sectigo certificate for www.example.com and example.com in one request
Renewing a wildcard certificate for *.example.com when the old private key should be retired
Requesting an internal certificate from a corporate Microsoft AD CS or HashiCorp Vault PKI
Creating an ECDSA P-256 request for a load balancer such as AWS Application Load Balancer or NGINX
Checking which openssl flags your team's renewal runbook should use

Supported Formats

PEM

PKCS #10

PKCS #8

RSA

ECDSA P-256

ECDSA P-384

Related Keywords

csr generator

csr generator online

generate csr online

certificate signing request generator

csr generator with private key

create csr for ssl certificate

ecdsa csr generator

wildcard csr generator

csr with subject alternative names

openssl csr command generator

What does a certificate authority actually use from a CSR?

For a domain-validated certificate, the CA takes the public key and the domain names and discards most of the rest. Browsers match only the Subject Alternative Names, so every hostname you need must be listed there, which this generator does. Organization, city, state and country matter only for organization-validated (OV) and extended-validation (EV) certificates, where the CA checks them against business records. Keep the private key: the certificate the CA returns works only with the key that signed this request.

The private key is created in your browser

Keys come from the Web Crypto API in this tab. Nothing is sent to a server, and only your form settings, never the key, can be saved with DataActions.

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Frequently asked questions

What is CSR Generator used for?

CSR generator that creates a certificate signing request and private key in your browser. RSA or ECDSA keys, multiple SANs, wildcards and the openssl command.

Is CSR Generator free to use?

Yes. CSR Generator is completely free with no usage limits, and there is no paid tier required to use it.

Do I need an account to use CSR Generator?

No. CSR Generator works immediately in your browser with no signup, login, or email address required.

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