The meta tags that actually affect SEO
Of the dozens of tags that can live in a <head>, a handful do the heavy
lifting: the title tag (the strongest on-page relevance signal and your ad
copy in the results page), the meta description (no ranking weight, big
click-through weight), robots (indexing on/off switch),
canonical (duplicate consolidation), viewport (mobile
usability, which is a ranking factor), and hreflang for multilingual sites.
The keywords meta tag, meanwhile, has been dead since 2009 — this analyzer flags it as
removable clutter rather than pretending it matters.
Pixels, not characters
Most meta checkers count characters, but Google truncates by pixel width — about 580 px for titles and 920 px for descriptions on desktop. "WWW III" and "illicit" are both seven characters but very different widths. This tool renders your actual title and description in a Google-metric font and measures them, so its truncation warnings match what searchers really see.
Related checks
- Indexing can also be blocked at the HTTP level — verify
X-Robots-Tagwith the HTTP Header Checker. - Social preview tags get a deeper treatment (platform previews, image validation) in the Open Graph Checker.
- Crawl permissions live in robots.txt — test them with the Robots.txt Tester.
Frequently asked questions
How do I check the meta tags of a page?
Enter a URL (or paste the HTML) and click Analyze. You get every SEO-relevant tag — title, meta description, robots, canonical, viewport, hreflang, Open Graph, Twitter Card — each with a pass/warn/fail verdict, plus a Google result preview rendered at real pixel widths.
What is the ideal title tag length?
Think in pixels, not characters: Google truncates titles around 580 px on desktop (roughly 55–65 characters, but wide letters count for more). This tool measures your title’s actual rendered width, which is more accurate than any character count.
What is the ideal meta description length?
Around 120–160 characters (~920 px). Shorter is fine if it’s compelling; longer gets cut mid-sentence. Note that Google rewrites descriptions for many queries — a good description is a suggestion, not a guarantee.
What does the robots meta tag do?
It tells crawlers whether to index the page and follow its links (e.g. noindex, nofollow). The analyzer flags noindex prominently because a forgotten one is the most common cause of "my page disappeared from Google". Remember the HTTP X-Robots-Tag header can also carry these directives — check it with our HTTP Header Checker.
Why is a canonical tag important?
The canonical URL tells search engines which version of a page is the "real" one when several URLs serve the same content (tracking parameters, www/non-www, http/https). Missing or self-contradictory canonicals split ranking signals between duplicates.
Can I analyze a staging page that is not public?
Yes — use the Paste HTML tab. Parsing happens in your browser, so your unpublished markup never leaves your device.