Why this matters
Submitting a sitemap with broken URLs to Google Search Console is one of the most avoidable SEO mistakes you can make. When Googlebot encounters a 404 or 500 in your sitemap, it wastes crawl budget on dead pages and may reduce the crawl frequency of your healthy URLs as a consequence. Over months, this compounds into lower index coverage and slower ranking improvements for content that deserves attention.
Most sitemaps are generated automatically by CMS plugins or build scripts, which means broken URLs creep in silently after page slugs change, products are discontinued, or redirect chains break. Manually spot-checking a few URLs gives false confidence. A batch validator that tests every URL with real HTTP requests catches the failures that visual inspection misses, and it does it before you ever submit the sitemap to search engines.
Reference table
| Status code | Meaning | Action |
|---|---|---|
| 200 | Page reachable | No action needed |
| 301 / 302 | Redirect | Update sitemap to final URL |
| 403 | Forbidden | Check server permissions |
| 404 | Not found | Remove or fix the URL |
| 500 | Server error | Fix server, revalidate |
| 0 | CORS blocked | Recheck manually |
How to use it
Paste your sitemap URLs into the textarea, one per line — up to 50 entries per batch.
Click 'Validate URLs' to dispatch a HEAD request to every URL simultaneously.
Review the results: green entries indicate reachable pages, red entries failed the check.
Examine the HTTP status code column for each failed URL to determine whether the issue is a 404, 500, redirect, or CORS block.
For sitemaps larger than 50 URLs, split the list into multiple batches and validate each group separately.
Testing your result
Run the validator on a known-good URL like your homepage to confirm it returns 200 and displays in green. Then test a deliberately broken URL — a nonexistent path on your domain — and verify it appears red with a 404 status. If you have a URL behind a redirect, confirm the tool shows the 301 or 302 code. Finally, paste a URL from a domain that blocks cross-origin requests and check that it either shows status 0 or a red indicator, confirming the fallback behavior works.
Common mistakes
Including trailing whitespace or blank lines in the textarea, which the tool may interpret as invalid URLs and skip.
Forgetting that status 0 means CORS blocked the request rather than the page being offline — the page might be perfectly fine but unreachable from a cross-origin context.
Not following up on 301 and 302 redirects, which waste crawl budget because Googlebot must follow the chain before reaching the final page.
Validating only a small sample instead of testing the full sitemap, which misses errors clustered in specific sections like archived blog posts or discontinued product pages.
Ignoring the 50-URL batch limit and pasting hundreds of lines, which can lead to incomplete results.
Edge cases and options
The validator uses HEAD requests first because they are lightweight and do not download the full page body. If the server blocks HEAD with CORS restrictions, the tool automatically falls back to a GET request in no-cors mode. In this fallback mode, the tool can detect reachability — a green or red indicator — but cannot read the exact HTTP status code, which is why some URLs show status 0. This is a browser security limitation, not a tool bug. Pages behind authentication or paywalls may appear red even though they are functional for logged-in users.
Real-world use cases
SEO auditors validating sitemaps before quarterly submissions to Google Search Console and Bing Webmaster Tools.
E-commerce teams checking product URLs after a site migration to catch redirect chains and 404s from changed slug patterns.
Content managers auditing blog sitemaps after consolidating or deleting old posts to ensure no dead links remain.
Developers verifying that staging environment URLs return expected status codes before pushing a new sitemap to production.
Frequently asked questions
Q: How does the validator check URLs?
A: Each URL is fetched with a HEAD request. If HEAD is blocked by CORS, the tool falls back to a GET request in no-cors mode. The HTTP status code is shown for each URL.
Q: Why are some URLs shown as status 0?
A: Status 0 appears when CORS blocks both HEAD and GET. In no-cors mode, we can only detect if the URL is reachable (green) or not (red), but we cannot read the exact status code.
Q: How many URLs can I check at once?
A: Up to 50 URLs per batch. For larger sitemaps, split the list into multiple batches of 50 or fewer and validate each group.
Q: Should I remove redirected URLs from my sitemap?
A: Yes. Google recommends listing only canonical URLs in your sitemap. Redirects waste crawl budget and add unnecessary latency to the crawling process. Replace every redirected entry with its final destination URL.
Q: Can I validate URLs behind a firewall or VPN?
A: The tool sends requests from your browser, so it can reach any URL your current network connection can access. If a URL is only available on an internal network, you must run the validator from a device on that network.
Q: Are my URLs uploaded or stored?
A: The URLs are fetched from your browser to test them — this is the purpose of the tool. No data is stored or shared.
Start using it now
Try the Sitemap URL Validator tool. See also XML Sitemap Generator, Robots.txt Generator, and SERP Preview.
