WHOIS Lookup
Featured
Look up domain registration details via RDAP.
- On your device
- No signup
Online lookup
This tool looks up information online. Results may be incomplete or slow during busy times.
Related tools
DNS Lookup
Featured
Look up DNS records for a domain.
- On your device
- No signup
HTTP Header Checker
Featured
Inspect HTTP response headers for a URL.
- On your device
- No signup
JSON Formatter
Featured
Format, minify, and validate JSON with optional key sorting.
- On your device
- No signup
JSON Compare
Featured
Compare two JSON documents and list structural differences.
- On your device
- No signup
XML Formatter
Featured
Format, minify, and validate XML with readable indentation.
- On your device
- No signup
XML Compare
Featured
Compare two XML documents and list structural differences.
- On your device
- No signup
Base64 Encoder & Decoder
Featured
Encode and decode text with Base64.
- On your device
- No signup
Enter a domain to list certificate transparency entries with issuer and validity dates using the crt.sh public database.
How to use this tool
1. Enter the domain, IP, ZIP code, or URL requested by SSL Checker. 2. Click the lookup or check button. 3. Wait for the external service response. 4. Review the formatted results table or details. 5. Copy values you need—do not query sensitive internal hosts. This tool uses an online lookup—see the privacy note for what is sent.
Worked example
Example: paste a small sample input into SSL Checker, run the transform or validation, and compare the output with the before text—fix any syntax errors reported before copying.
How it works
Enter a domain to search certificate transparency logs via crt.sh for issued SSL/TLS certificates. The domain you enter is sent to that service.
Limitations
Results are based on the inputs you provide and may not cover every edge case. This tool is for general use and is not professional advice.
Privacy and file handling
This tool looks up information online. Results may be incomplete or slow during busy times.
FAQ
Frequently asked questions
Is SSL Checker free?
Yes. It is free to use and you do not need to sign in or create an account.
Is my data private?
See the privacy note on this page. Many tools run on your device; some heavier file tools may use secure temporary processing when required.
Can I use SSL Checker on mobile?
Yes. Open this page on your phone or tablet, enter your inputs, and use the on-screen controls.
Part of these workflows
This tool is one step in a longer job. Jump straight to your step or open the full workflow guide.
Related pages
- Network tools — compare developer tools and read FAQs
- Debug a site before launch — step-by-step workflow
- Pre-launch domain and TLS check — step-by-step workflow
- Browse all free online tools on Utilnivo
- Explore more developer tools on Utilnivo
- WHOIS Lookup — Look up domain registration details via RDAP.
- DNS Lookup — Look up DNS records for a domain.
- HTTP Header Checker — Inspect HTTP response headers for a URL.
Page last reviewed: