URL List Validator (format and duplicates)
100% PrivateWebsite & Webmaster ToolsCheck a pasted list of URLs for format problems, missing protocols and duplicates.
Runs entirely in your browser. Your input is not uploaded to Ovatly or anywhere else.
Format and duplicates only. This tool never visits the addresses, so it cannot tell you whether a page is online, offline or returns a 404. That kind of live check needs a server.
- 1Paste the URL list, one address per line.
- 2Read the summary: valid, invalid and duplicate counts plus the http/https split.
- 3Use the line-by-line table to fix each flagged address.
For the lines https://example.com/ , http://example.com/old , https://example.com and htp://typo.example.com the report reads: 4 addresses, 3 valid, 0 invalid, 1 duplicate (line 3 repeats line 1). Line 4 is valid syntax but flagged as a non-web scheme, because htp is a scheme a browser will not open as a page.
- Duplicate comparison ignores the fragment (#section), the default port (80 or 443), host letter case, and a lone trailing slash, because all four spellings reach the same resource.
- A typo in the scheme itself, like htp://, still parses as a URL; the validator flags non-http(s) schemes rather than calling them invalid.
- Reachability, redirects and status codes are not and cannot be checked from a browser page; use a server-side or command-line tool for live checks.
Checking a link means requesting it, and browsers block pages from requesting arbitrary other sites (CORS). Live checking needs a server component, which this tool does not have and does not pretend to have.
About this tool
The URL List Validator checks a pasted list of URLs for format problems and duplicates: missing protocols, unparseable addresses, http/https mix, and the same destination appearing more than once under different spellings. It is deliberately honest about its limit, stated on the tool itself: it checks syntax only and never visits the addresses, so it cannot tell you whether a page is live or returns a 404.
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Part of Ovatly's free tools in Website & Webmaster Tools.