Extract all URLs from a Markdown file and check for format errors and DNS failures. Reports relative paths, malformed URLs, and unreachable domains. Free.
Free is enough for most one-off jobs. Pro raises the file and batch caps; Pro + Media unlocks GB-scale streaming and unlimited duration.
Larger files supported on Developer (5 GB CSV) and Enterprise (unlimited). All processing happens in your browser — files never reach a server.
Paste your Markdown or drop a .md file
The tool extracts all [text](url) links and bare URLs, then validates each one
Review the report: invalid format, relative paths, and unreachable domains are flagged
0 bytes uploaded. Link Validator runs entirely in your browser using JavaScript. Your markdown — including any secrets, PII, or proprietary content — never leaves your device. No data is sent to any server.
No — browser security (CORS) prevents checking HTTP response codes from client-side JavaScript. The validator detects URL format errors (malformed syntax) and DNS failures (domain does not exist). For production link auditing with 404 detection, use a server-side crawler.
URLs that fail the URL constructor (invalid syntax, missing protocol), relative paths that can't be resolved, and domains that fail DNS lookup in the browser are all reported.
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