English English French French Spanish Spanish German German
Geekflare is supported by our audience. We may earn affiliate commissions from buying links on this site.
Share on:

9 Free Online SSL/TLS Certificate Tools 

zerossl apache nginx
Invicti Web Application Security Scanner – the only solution that delivers automatic verification of vulnerabilities with Proof-Based Scanning™.

Fast track your SSL/TLS certificate-related work with these tools to help you to create, test, convert, secure, configuration, and much more.

Implementing SSL/TLS certificate is essential to a website. Not just to secure but also to rank higher in a search engine.

If you are a Web Engineer, then you may need to deal with various certificate-related tasks, which you may do it using OpenSSL or some other procedure manually.

You can either buy an SSL/TLS certificate from a reputed brand like Symantec, GeoTrust, RapidSSL, Thawte, etc., or get it FREE from Let’s Encrypt.

Getting things done is good, but doing faster is always better. And to do things faster, you need tools. Tools that can help you to facilitate your task.

The following online tools will cover a large number of tasks you do it manually.

Create a CSR

CSR (Certificate Signing Request) is the first thing you need to generate where you supply necessary identity information.

  • CN – Common Name (Often URL)
  • OU – Organizational Unit (Department)
  • O – Organization (Company name)
  • Signature Algorithm (SHA2)
  • Key size

You can use CSR Generator where you put all the information, and you get your CSR along with the private key.

csr-generator

Some other alternative CSR generator.

CSR Verification

If you have entered all information during the CSR generation process, you may not need it; however, if you want a double eye check, then you can use the following tools to verify them.

By verifying, you ensure your CSR is generated with accurate information.

CSR Decoder by SSL Shopper

Verification tools very handy when you have generated CSR with SAN (Subject Alternative Name) or wildcard and not sure if CSR has picked them.

Convert Certificate Format

One of the time-consuming tasks is to change the certificate format. This is often needed when you have created a certificate for one platform and needed for another.

If you are in a situation to convert the format and are not sure about the commands, then the following tools will be a great help.

Converter lets you convert the certificate to/from PEM, DER, PFX & P7B format.

converter

And some alternatives to doing this task.

SSL Converter by SSL Checker

Certificate Verification

Above you saw CSR decoder where you can verify the information before getting signed by the authority.

How about verifying once you have received the signed certificate?

Certificate verification is necessary to ensure you received from the signer what you have requested, and the following will help you with that.

Decode SSL Certificate will decode the  PEM file text and let you know information such as CN, OU, U, hash, serial number, etc.

Cert Installation Checker

Once you have implemented SSL in your web server (Apache, Nginx, etc.), there are many things that can go wrong.

Example:

  • Chain (root/intermediate) certificate brThe wrong
  • certificate got implemented

SSL Checker will help you with that; you need to provide the website URL.

Another one would be SSL Installation Diagnostic by Digicert. Digicert print useful information like:

  • Resolving IP
  • CN, SAN, issuer, serial number, key length, signature algorithm
  • OSCP/CRL status
  • Expiration
  • Chain installation

Insecure Content Checker

If you have migrated your website from HTTP to HTTPS, then you got to ensure all resources (JS, CSS, Images, etc. ) are loading through HTTPS.

If not, then your user will get a “Mixed Content” warning. To test your website, if having insecure resources, you can use the following tools.

If you are using WordPress or Joomla and using Cloudflare, you may get this warning, and here I explained how to fix it.

Cert & Key Matcher

If you are working on an existing certificate and are not sure if you have a valid private key, then you can verify them online.

Note: you got to upload your private key, and you don’t want to do it from your production environment. So, assess the risk before you do.

Certificate Key Matcher by SSL shopper.

Security Test

The most important part is to ensure your SSL implementation is secure. Using weak cipher, misconfiguration, a lower protocol can be vulnerable, and there many things involved in this.

There are some tools I mentioned here to test the SSL/TLS security.

SSL Configuration Generator

When implementing a certificate on your web server, you need some configuration syntax. If you remember, then good enough; otherwise, you can always check the Mozilla SSL configuration generator.

mozilla-ssl-config

You can get the security configuration for the following web servers quickly.

  • Apache HTTP
  • Nginx
  • Lighttpd
  • HAProxy
  • AWS ELB
  • Tomcat

I hope the above tools give you an idea of how to get SSL/TLS related work done online without using a command.

Thanks to our Sponsors
More great readings on Security
Power Your Business
Some of the tools and services to help your business grow.
  • Invicti uses the Proof-Based Scanning™ to automatically verify the identified vulnerabilities and generate actionable results within just hours.
    Try Invicti
  • Web scraping, residential proxy, proxy manager, web unlocker, search engine crawler, and all you need to collect web data.
    Try Brightdata
  • Semrush is an all-in-one digital marketing solution with more than 50 tools in SEO, social media, and content marketing.
    Try Semrush
  • Intruder is an online vulnerability scanner that finds cyber security weaknesses in your infrastructure, to avoid costly data breaches.
    Try Intruder