Reference guide for resolving the most frequent configuration errors and warnings.
The page has no title tag
Without a <title>, Google generates one from the page content — usually the h1 or anchor text pointing at the page. You lose control of the single most visible line in the search result.
The Fix: Add a <title> inside <head>. Put the distinctive part first, since the end is what gets cut off.
<title>Robots.txt Tester - Check if a URL is blocked</title>
The title is wider than Google displays
Google truncates titles by rendered pixel width, not character count. Anything past roughly 580px is replaced with an ellipsis, so the end of your title never reaches the reader.
The Fix: Move the important words to the front and cut the tail. Brand suffixes are the usual thing to shorten or drop — they are the least useful part of the line.
The title is very short
A short title is not an error, but it leaves visible space unused and often means the page is not describing itself fully.
The Fix: Add the qualifier a searcher would actually type — the location, the format, the year, the specific problem being solved.
No meta description
Google will write a snippet itself, pulled from wherever on the page seems to match the query. It is often a reasonable snippet — but it is not the one you chose.
The Fix: Add a meta description in <head> that makes the case for clicking, written for a person rather than for a keyword count.
<meta name="description" content="Free robots.txt tester. Test any URL path against a site’s rules and see exactly which directive blocks it.">
The description will be truncated
Past roughly 920px of rendered width the snippet is cut off. Everything after the cut is invisible in the result.
The Fix: Put the reason to click in the first sentence, and treat anything after that as a bonus that may never be seen.
No canonical tag
Google picks a canonical for every page whether you specify one or not. Without the tag, that choice is made for you — and on sites with query parameters or duplicate paths, it is often the wrong URL.
The Fix: Add a self-referencing canonical to every indexable page. It is the cheapest insurance against duplicate-content ambiguity.
<link rel="canonical" href="https://example.com/blog/post">
More than one canonical tag
When a page declares several canonicals, Google treats the signal as unreliable and ignores all of them. This usually happens when a CMS and a plugin both add one.
The Fix: Leave exactly one. Check for a theme and an SEO plugin both injecting a tag into the head.
The canonical points at a different domain
This page is telling Google that the canonical version lives on another site, so the other site is the one that should rank. That is correct for syndicated content and a serious bug otherwise.
The Fix: If this is your page, point the canonical at itself. Cross-domain canonicals should only be used when you deliberately want the other URL to rank instead.