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Scan websites for broken links (404 errors), validate HTTP status codes (200, 301, 302, 404, 500), check redirect chains and loops, test internal and external links, detect slow-loading resources, and generate comprehensive link health reports with fix suggestions.
Note: AI can make mistakes, so please double-check it.
Paste HTML code containing links to check for broken URLs
Common questions about this tool
Scan websites for broken links (404 errors), validate HTTP status codes (200, 301, 302, 404, 500), check redirect chains and loops, test internal and external links, detect slow-loading resources, and...
The validator checks for syntax errors, format violations, and structural issues. It provides detailed error messages with line numbers and descriptions to help you fix validation problems quickly.
Yes, you can validate multiple items at once. The tool processes each item, identifies errors, and provides comprehensive validation reports for efficient batch processing.
The validator follows official standards and specifications, providing accurate validation results. It catches common errors and edge cases to ensure your link checker meets requirements.
The validator follows official industry standards and specifications to ensure accurate validation. It checks compliance with established rules and best practices for link checker.
Verified content & sources
This tool's content and its supporting explanations have been created and reviewed by subject-matter experts. Calculations and logic are based on established research sources.
Scope: interactive tool, explanatory content, and related articles.
ToolGrid — Product & Engineering
Leads product strategy, technical architecture, and implementation of the core platform that powers ToolGrid calculators.
ToolGrid — Research & Content
Conducts research, designs calculation methodologies, and produces explanatory content to ensure accurate, practical, and trustworthy tool outputs.
Based on 2 research sources:
Learn what this tool does, when to use it, and how it fits into your workflow.
Link Checker finds broken links in HTML code. It scans HTML content, extracts all links, and tests if they work. This helps you find and fix broken links before users encounter them.
When websites have broken links, users see error pages. This creates bad experiences and hurts trust. Finding broken links by hand means checking each link one by one. This is slow and easy to miss. The checker tests all links automatically and shows which ones are broken.
This tool is for anyone who works with HTML content. Website developers use it to check pages before publishing. Content creators use it to verify links in articles. SEO professionals use it to maintain link quality. You do not need technical skills to use it.
Links connect web pages together. When you click a link, your browser requests that page. If the page exists, you see it. If the page is missing, you see an error. Broken links point to pages that no longer exist or cannot be reached.
People use links everywhere on websites. Navigation menus use links. Content articles link to related pages. Footer sections link to important pages. Social media buttons link to profiles. Valid links are essential for website functionality.
Finding broken links by hand is hard. You must visit each link and check if it works. Some links might work sometimes but fail other times. Some links redirect to other pages. Some links have security issues. Checking many links takes hours and is error-prone.
When links are broken, users get frustrated. They click links expecting content but see errors instead. This hurts user experience and website reputation. Search engines may lower rankings for sites with many broken links. The checker automates this process. It tests all links quickly and shows problems clearly. This saves time and improves website quality. A related operation involves checking backlinks as part of a similar workflow.
Website developers use this tool to check pages before publishing. They paste page HTML and scan for broken links. They fix problems before users see them. This prevents user frustration and maintains site quality.
Content creators use it to verify links in articles. They paste article HTML and check all links. They ensure external links work correctly. They fix broken references before publishing. This maintains content quality.
SEO professionals use it to maintain link health. They check website pages regularly for broken links. They fix broken internal links that hurt SEO. They remove or update broken external links. This improves search rankings.
Website administrators use it for site maintenance. They scan pages periodically to find broken links. They fix problems before users report them. They maintain overall site quality. This prevents user complaints.
Quality assurance testers use it during testing. They check pages for broken links before releases. They verify that all links work correctly. They report problems for fixing. This ensures release quality.
Content managers use it to audit existing content. They check old articles and pages for broken links. They update or remove outdated links. They maintain content freshness. This keeps content useful over time. For adjacent tasks, checking IP ports addresses a complementary step.
The tool uses several steps to check links. First, it parses HTML content using the browser's DOMParser. It finds all anchor tags with href attributes. It extracts URLs and anchor text from each link.
Link extraction limits processing to 50 links maximum. This prevents performance issues with very large HTML files. Links beyond the limit are not processed. The tool shows a notification when limits are reached.
URL extraction reads href attributes from anchor tags. It handles absolute URLs with full domains. It handles relative URLs that need base URLs. It extracts anchor text from link content or title attributes.
HTML context extraction captures surrounding code. It takes up to 500 characters around each link. This shows link location in HTML structure. This helps identify links for fixing.
Link validation sends HTTP requests to each URL. It uses HEAD requests first for speed. If HEAD fails, it tries GET requests. It sets timeouts to prevent hanging.
Status code interpretation determines link health. Status 200 means links work correctly. Status 404 means pages are not found. Status 500 means server errors. Status 300-399 means redirects. When working with related formats, checking color contrast can be a useful part of the process.
Error type classification categorizes problems. NOT_FOUND covers 404 errors and missing pages. INVALID_URL covers malformed URLs and placeholders. TIMEOUT covers slow or unresponsive servers. SSL_ERROR covers certificate problems. SERVER_ERROR covers 5xx responses. REDIRECT_CHAIN covers redirect warnings.
Link grouping organizes broken links by error type. Links with the same error type are grouped together. Groups show titles, descriptions, and priorities. This makes large result sets manageable.
Priority assignment ranks issue importance. High priority applies to 404 errors and invalid URLs. Medium priority applies to timeouts, SSL errors, and server errors. Low priority applies to redirect warnings. This helps prioritize fixes.
Statistics calculation counts link types. It counts total links processed. It counts healthy links separately. It counts broken and warning links separately. It calculates scan time in milliseconds.
AI fix generation analyzes link context. It considers URL, error type, and HTML context. It generates specific fix suggestions. It provides actionable recommendations. This helps resolve problems quickly.
Always check links before publishing content. Broken links hurt user experience. Fix problems before users encounter them. This maintains website quality and trust. In some workflows, website seo checker is a relevant follow-up operation.
Use the tool regularly for maintenance. Check pages periodically to find new broken links. Links break over time as pages move or disappear. Regular checking maintains link health.
Prioritize High priority issues first. Fix 404 errors and invalid URLs immediately. These problems affect users directly. Address Medium priority issues next. Handle Low priority issues when possible.
Review AI suggestions carefully. AI provides helpful recommendations but may not always be perfect. Use suggestions as starting points. Verify fixes work correctly after applying them.
Check HTML context to understand link location. Context shows where links appear in code. This helps you find links quickly for fixing. This supports efficient problem resolution.
Use copy function to save broken link lists. Copy URLs for external tracking. Save lists in spreadsheets or issue trackers. This supports systematic fixing.
Open links manually to verify results. Some links might work despite errors. Some errors might be temporary. Manual verification helps confirm actual problems. For related processing needs, checking SSL certificates handles a complementary task.
The tool checks links, not page content quality. It verifies that links work but cannot check if pages are useful. It cannot verify that pages contain expected content. Use other tools for content quality checks.
Some links may require authentication. Links behind login pages cannot be checked. The tool only checks publicly accessible links. This is a limitation of automated checking.
Large HTML files are limited to 500KB. Very large files must be split into smaller chunks. Process chunks separately if needed. This ensures reasonable performance.
Link processing is limited to 50 links per scan. HTML with more links processes only the first 50. Split large HTML into multiple scans if needed. This prevents performance issues.
Some servers may block automated requests. Servers with bot protection may reject checks. This causes false broken link reports. Manual verification helps confirm actual problems.
Redirect detection shows warnings, not errors. Redirects may be intentional and correct. Review redirects to ensure they point to correct destinations. Not all redirects need fixing.
Timeout errors may indicate slow servers. Some servers respond slowly but eventually work. Retry checks if timeouts seem unusual. This helps distinguish real problems from temporary issues.
Articles and guides to get more from this tool
Every website is built on connections. When you click a hyperlink, you expect it to take you somewhere. When another site links to you, that…
Read full articleSummary: Scan websites for broken links (404 errors), validate HTTP status codes (200, 301, 302, 404, 500), check redirect chains and loops, test internal and external links, detect slow-loading resources, and generate comprehensive link health reports with fix suggestions.