Qualys SSL Labs Server Test
ssllabs.com
Grades a site's TLS configuration from A+ down to F and says why
No sign-upClassic
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ssllabs.com
Grades a site's TLS configuration from A+ down to F and says why
securityheaders.com
Grades the HTTP security headers a site sends and names the missing ones
urlscan.io
Opens a suspicious URL in a sandbox and shows you everything the page loaded
virustotal.com
Runs a file, URL or hash past seventy-odd antivirus engines at once
wheregoes.com
Follows a shortened link through every redirect and names the final destination
Where these come from
A real job usually crosses two or three categories, which is why starting from the task is often faster than starting from the shelf.
Questions
Expand the short URL first so you can see the real destination, then run the domain through a multi-engine reputation check. For a file, scan the hash rather than uploading the file itself when you can — a hash leaks nothing.
Yes — 5 of the 5 sites listed here work with no account at all. They are marked "No sign-up" and you can spot them by the green rule down the left edge of the card.
Every option here sends your file to a server to process it, so treat them as suitable for public material only. For anything containing personal data, use a tool that processes files on your own device.