URL Validator

Checks whether a single URL is syntactically well-formed, using the browser's own URL parser, and reports one of three outcomes: valid, missing a protocol, or containing stray spaces.

Type or paste a URL into the field. The result updates on every keystroke, showing a green valid message or a red invalid message with the specific reason as soon as you stop typing.

https://example.com/path?query=1 is reported valid. example.com/path (no scheme) is reported invalid with a missing-protocol reason, and https://example .com (a stray space before .com) is reported invalid with a contains-spaces reason.

Three checks run in order: the text is trimmed first, then checked for any remaining internal space, then checked for a leading scheme matching a pattern like https:// or ftp://, and finally handed to the browser's URL constructor — any of these three steps failing marks the input invalid, with a matching reason.

This is a format check only. It never makes a network request, so a URL that is perfectly well-formed but points to a domain that doesn't exist, isn't reachable, or returns a 404 will still be reported as valid.

Leading and trailing spaces are trimmed before checking, so they never trigger the space warning — only a space in the middle of the URL does. Relative paths and protocol-relative URLs (like //example.com) are always reported invalid, since they have no explicit scheme for the URL constructor to resolve.

Validation runs entirely client-side using the browser's built-in URL API. The address you type is never sent anywhere or requested.