| Generated at | Domains | Challenge method | Key type | Status | Reuse parameters |
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The Let's Encrypt Certificate Generator prepares a CSR (Certificate Signing Request) and ACME Shell command template required for requesting an HTTPS certificate. Enter one or more domain names, choose a validation challenge, key algorithm, and certificate subject information, and generate a certificate request template suitable for further execution on your server.
Let's Encrypt is a public certificate authority (CA) that provides free TLS certificates and uses the ACME protocol to automate domain validation and certificate issuance. Website administrators can use ACME-compatible clients to request and automatically renew HTTPS certificates.
This tool primarily generates the CSR required for a certificate request and an ACME Shell command template rather than directly issuing a certificate. The generated template can be adjusted according to the domain names, validation method, and key algorithm and then executed in your own server environment.
A CSR is a data structure submitted to a certificate authority when requesting a digital certificate. It contains information such as domain names and a public key and is signed with the corresponding private key. The CA decides whether to issue the certificate based on the CSR and successful domain validation.
The tool can generate ACME-related Shell command templates according to the selected challenge method, making it easier for server administrators to continue domain validation and certificate requests on their own Linux servers.
HTTP-01 verifies domain control through an HTTP service. The ACME client provides a validation file at a specified path, and the Let's Encrypt validation server accesses the URL and verifies the expected content. This method is suitable for domains that can provide normal HTTP web service.
DNS-01 proves domain control by adding a specified TXT record to the domain DNS system. This method can be used to request wildcard certificates such as *.example.com, but it requires the ability to manage DNS records for the domain.
When preparing a certificate request, you can choose an appropriate key algorithm and parameters for your server environment. RSA provides broad compatibility, while ECC can provide strong cryptographic security with shorter key lengths.
RSA is a traditional public-key cryptographic algorithm with broad compatibility. It is suitable for environments that need to support a wide range of older systems, servers, and clients.
ECC, or Elliptic Curve Cryptography, can provide strong security with shorter keys and is widely supported by modern web servers and TLS environments.
A TLS certificate can contain multiple domain names through SAN (Subject Alternative Name). Adding multiple domains that should use the same certificate to the domain list generates the corresponding multi-domain certificate request information.
The primary domain can be entered as the CSR subject CN. If CN is left empty, the tool can use the first domain in the domain list as the subject CN, while the remaining domains are included as additional names.
This tool only generates the CSR and Shell command template. It does not make a real ACME request to Let's Encrypt and does not automatically complete domain validation or certificate issuance. The actual application process still requires an ACME client running on your own server and completion of the corresponding HTTP-01 or DNS-01 domain validation.
ACME certificate issuance involves the server environment, domain control validation, DNS or HTTP configuration, and private key security. Running the application process in your own server environment keeps private keys and ACME account-related data under your control.
A private key is a sensitive credential in the TLS certificate system and should only be stored on trusted servers or secure key storage systems. Do not upload production private keys to third-party websites, chat applications, or untrusted servers.
A CSR can be submitted to a certificate authority, but the private key must remain under the control of the certificate owner. Any third party that obtains the private key may be able to impersonate the corresponding server and establish TLS connections.
No. This tool only generates a CSR and ACME Shell template. It does not make a real ACME request to Let's Encrypt. The generated result must be executed and verified in the user's own server environment.
If the domain can provide normal HTTP service, HTTP-01 is usually simpler. If you need a wildcard certificate or cannot provide the validation file through HTTP, DNS-01 can be considered.
The registration email is not a core parameter for generating a CSR, but using a valid email is recommended so that the ACME account or certificate management process can receive relevant notifications.
Wildcard certificates normally require the DNS-01 challenge to verify domain control. Successful issuance also depends on the ACME client and DNS provider configuration being used.
The tool can save a limited generation history in the current browser session so you can review previously generated request configurations. The history does not contain private keys or CSRs and stores a maximum of 20 records.
The Let's Encrypt Certificate Generator is suitable for website administrators, developers, and server operators who need to prepare CSRs and ACME certificate request templates. The tool does not upload or manage production private keys, and actual certificate issuance must be completed in the user's own server environment.
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