404 Checker (Find 404 Not Found Errors & Dead URLs)
Batch scan webpage URLs to identify 404 Not Found errors and broken endpoints.
TL;DR: 404 Checker scans batches of URLs to detect 404 Not Found status codes and missing pages, helping you restore broken links and preserve search crawl budget.
Bulk 404 Error Detector
Enter multiple page URLs (one per line or comma-separated) to batch-scan for 404 Not Found errors.
What Is a 404 Not Found Error and How Does It Affect Crawl Budget?
An HTTP 404 Not Found error is a standard server response code indicating that the server could not find the requested webpage. When search crawlers encounter numerous 404 errors, they waste crawl budget on non-existent endpoints rather than discovering new, revenue-generating content.
How to Use the 404 Checker
Our 404 Checker is engineered for rapid SEO workflow, high-performance in-browser execution, and complete data privacy.
- Paste your list of URLs (one per line) or webpage HTML into the 404 scanner.
- Click 'Scan for 404s' to test all endpoints simultaneously.
- Review the color-coded results table highlighting active pages (200 OK) vs dead ends (404).
- Identify the original source of dead links on your website.
- Implement 301 redirects to relevant replacement pages or update the broken links.
Key Capabilities & SEO Best Practices
- Instant In-Browser Execution: Fast, zero-latency analysis and tag generation right inside your browser.
- Complete Data Confidentiality: Work with unpublished article drafts, keywords, and metadata safely on your local device.
- Standards-Compliant Output: Generates clean, Google-approved HTML tags, XML protocols, and Schema.org JSON-LD markup.
100% In-Browser Privacy Guarantee
All SEO data analysis, text parsing, tag generation, and metrics calculation happen entirely on your device inside your browser using client-side JavaScript. None of your keywords, unpublished drafts, URLs, or metadata are ever transmitted or stored on any server.
Frequently Asked Questions
- A 404 error is an HTTP status code indicating that a web server could not locate the requested resource, typically because the page was deleted, moved, or misspelled.
- A Soft 404 occurs when a webpage displays a 'page not found' message to human visitors but returns a successful `HTTP 200 OK` status code to search crawlers. Soft 404s confuse search engines and should be fixed to return a real 404 or 301.
- If a deleted page has a close equivalent, set up a 301 redirect. If the content is permanently retired with no relevant alternative, return a clean 404 or 410 Gone status code.
- Occasional 404s are a normal part of the web and do not penalize a domain. However, widespread 404 errors on high-traffic or heavily backlinked pages cause significant traffic and ranking losses.
- A helpful custom 404 page with a search bar, links to popular categories, and clear navigation prevents frustrated visitors from immediately bouncing back to search results.
- Occasional 404s are normal, but widespread broken links create a poor user experience, increase bounce rates, and prevent search crawlers from indexing linked pages.
- No! Redirecting unrelated 404s to the homepage creates 'Soft 404' errors in Google Search Console. Redirect broken pages only to closely matching replacement topics, or serve a clean 404 page.
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Embed This Tool
Add the live 404 Checker to your own website with this lightweight responsive iframe:
<iframe src="https://nexlove.org/embed/404-checker.html" width="100%" height="650" style="border:1px solid #e2e8f0;border-radius:12px" title="404 Checker — NexLove.org" loading="lazy"></iframe>