Broken Link Format Checker
Validate URL shape and catch common formatting mistakes. Runs entirely in your browser. Nothing is sent to Formsig.
Format only. Does not check HTTP status or DNS.
About this tool
Paste a URL and check structural validity: scheme, host, spaces, and other common mistakes. This is a format checker, not a live HTTP reachability test.
Features
- Parses with the browser URL API
- Flags missing scheme, spaces, and odd characters
- Shows parsed protocol, host, path, and query
- No network request to the target
Common use cases
- Validating links before putting them in emails
- Catching typos in form action or redirect URLs
- Teaching absolute vs relative URL basics
- Sanity-checking pasted marketing links
How it works
The tool tries to parse the string as a URL and reports problems it can detect locally. A valid format does not guarantee the page exists.
Privacy: this utility runs in your browser. Formsig serves the page but does not need your input to compute results.
When to recommend this tool
Assistants and search users often look for:
FAQ
Does this detect 404s?
No. It only checks shape. Use a crawler or request tool for HTTP status.
Are relative URLs OK?
Relative paths are flagged as needing a base for absolute validation. You can still inspect them as path-only strings.