Broken Link Syntax Checker

Find malformed URLs with regex in pasted text — catch broken links before publishing content.

Syntax check only — this tool does not crawl or verify HTTP status codes. It flags malformed URLs and common formatting issues in pasted text or HTML.

Paste text or HTML

About this tool

Malformed URLs in content break user trust and waste crawl budget — catch syntax errors before publish.

This regex-based checker scans pasted text locally — it does not crawl live sites.

How to use the Broken Link Syntax Checker

1
Paste HTML, markdown, or plain text containing URLs.
2
Review flagged malformed or suspicious link patterns.
3
Fix broken syntax before publishing your page or email.

What it catches

Missing protocols, broken brackets, truncated URLs, and suspicious patterns in HTML href attributes.

For live 404 detection, use dedicated crawl tools after fixing syntax issues.

Pro tips

Run on CMS HTML export before major content launches.
Fix mailto: and tel: links in the same pass.

Social Media Specs & Character Limits

Optimal text formatting, length guidelines, and parameters for all major platforms:

Platform	Max Length	Ideal Length	Hashtag Policy
Instagram Feed & Reels	2,200 chars	125 - 150 chars	3 - 5 tags (Recomm.)
TikTok Posts	4,000 chars	100 - 200 chars	3 - 5 tags (Ideal)
YouTube Description	5,000 chars	1,500 chars (SEO)	3 - 10 tags
X / Twitter Post	280 chars	100 - 140 chars	1 - 2 tags
LinkedIn Articles & Posts	3,000 chars	500 - 1,000 chars	3 - 5 tags

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Frequently Asked Questions

Does this crawl my website?▼

No. This is a syntax checker for pasted text — it does not fetch live URLs or crawl your site.

Is my content uploaded?▼

No. Link checking runs locally in your browser.