What is Signal Index?
Signal Index is a free tool that scans your entire website for noindex signals — automatically, from the root domain. Enter your domain once, and Signal Index crawls every discovered page, checking HTML meta robots tags, X-Robots-Tag HTTP headers, and robots.txt directives to identify any page blocking search engine indexing.
How Signal Index is Different from Other Noindex Checkers
Most noindex checker tools — including bulk checkers — require you to manually enter URLs one by one. Signal Index is different: enter just the root domain, and the tool automatically discovers and scans every page on your website. No manual URL entry. No spreadsheet preparation. No subscription required.
Enterprise platforms like Semrush, Ahrefs, and SiteCheckerPro offer full-site indexability auditing — but only within their paid plans. Signal Index provides the same full-website noindex scanning capability, completely free, with no account required.
- Enter root domain — no URL list needed
- Auto-crawl — discovers all pages automatically via sitemap and internal links
- Live results — watch pages being scanned in real time
- Three signal types checked — HTML meta robots, X-Robots-Tag HTTP header, robots.txt
- CSV export — download full report instantly
- No signup, no subscription, no limit
What Noindex Signals Does Signal Index Check?
Signal Index scans every discovered page on your website for three types of noindex signals:
- HTML meta robots tag -
<meta name="robots" content="noindex">in the page's HTML head - X-Robots-Tag HTTP header - noindex directive sent in the server response header (invisible in HTML, commonly missed)
- robots.txt Disallow rules - URL paths blocked from crawling at the domain level
Each page in the scan result is classified as: Indexable (no blocking signals found), Noindex Found (one or more noindex signals detected), or Blocked (URL prevented from crawling by robots.txt).
When Should You Use a Full Website Noindex Checker?
- After a website migration — staging environments commonly have noindex enabled; missing this after launch is one of the most common and damaging SEO mistakes
- After a CMS or theme update — updates can accidentally reset robots settings
- During a technical SEO audit — full-site indexability check as part of standard audit workflow
- When organic traffic drops unexpectedly — accidental noindex is frequently the cause
- Before a site goes live — confirm no development noindex settings survived to production
How Large a Website Can Signal Index Handle?
Signal Index has been successfully tested on websites with up to several hundred pages, scanning and reporting results without interruption. The tool uses an asynchronous crawling approach with deliberate pacing to remain stable on shared infrastructure. We are actively working to extend capacity and improve performance — feedback from power users is welcomed.
Frequently Asked Questions — Full Website Noindex Checker
A noindex checker is an SEO tool that detects whether a webpage or website has noindex directives that prevent search engines from indexing it. Signal Index extends this to scan an entire website automatically — not just individual URLs — by entering only the root domain.
Enter your root domain into Signal Index (e.g., example.com) and click Scan. The tool automatically discovers and checks every page on your website for noindex signals — including HTML meta robots tags, X-Robots-Tag HTTP headers, and robots.txt rules. No URL list needed.
Bulk noindex checkers require you to manually enter or upload a list of URLs. Signal Index requires only the root domain — it discovers all URLs automatically by crawling the site. This eliminates the manual step entirely and ensures no pages are missed because they were not included in a URL list.
Yes. Signal Index is completely free to use. There is no subscription, no account required, no usage limit. Enter your domain and scan — no payment information is ever requested.
Noindex is a directive that instructs search engines not to include a specific page in their search index. A page with noindex will not appear in Google Search results, regardless of its content quality or backlinks. Accidental noindex — particularly after site migrations or CMS updates — is one of the most common causes of unexpected organic traffic drops.
Yes. Signal Index checks robots.txt Disallow rules in addition to HTML meta robots tags and X-Robots-Tag HTTP headers. All three are shown in the results, so you can see exactly which signal is causing a page to be blocked.
Yes. Signal Index provides a CSV export button after the scan completes. The CSV includes each URL, its indexability status, and which signal type was detected — ready for use in SEO audit reports or sharing with clients.
During development and staging, websites are commonly set to noindex to prevent search engines from indexing an unfinished site. This setting is sometimes not removed before the site goes live — a mistake that can cause a complete loss of organic rankings. Signal Index is specifically useful for post-migration checks to confirm no noindex directives survived from the staging environment.