Web and Productivity Tools
DNS, SSL and header checks, link extraction, short links and more.
Website Status Checker
Check whether a website is responding, with its HTTP status, response time, server and content type.
Markdown Editor and Preview
Write Markdown and see the rendered result instantly. Copy the generated HTML when you are done.
Data Storage Converter
Convert between bits, bytes, kilobytes, megabytes, gigabytes and terabytes, in both decimal (1,000) and binary (1,024) units.
URL Shortener
Turn a long web address into a short link on this site that redirects to the original.
DNS Lookup
Look up the DNS records of a domain: A, AAAA, MX, NS, TXT, CNAME, SOA and CAA.
IP Information
See your public IP address, or look up any IP: version, whether it is public or private, and its reverse DNS name.
Domain Information Lookup
Find a domain's registrar, registration and expiry dates, name servers and status using public RDAP data.
HTTP Header Checker
View a page's HTTP response headers and see which common security headers are present.
SSL Certificate Checker
Check a site's SSL/TLS certificate: issuer, validity dates, days until expiry, covered names and whether the chain is trusted.
Website Response Time Checker
Measure how quickly a website answers: time to first byte and total download time, over three requests.
Robots.txt Viewer
Fetch and read a website's robots.txt, with its sitemaps and rules summarised.
Sitemap Viewer
Open a sitemap.xml and list the URLs inside it, or the child sitemaps if it is a sitemap index.
Link Extractor
List every link on a web page and separate internal links from external ones.
Password Strength Checker
Estimate how strong a password is, how long it could take to guess, and what to improve. The password never leaves your browser.