About Meta Tag Checking
Meta tags in HTML <head> control how search engines and social platforms display a page's preview. The most important tags include the <title>, <meta name="description">, Open Graph tags (og:title, og:description, og:image), and Twitter Card tags (twitter:title, twitter:description, twitter:image). When these tags are missing, malformed, or wrong, search snippets and social previews look broken or use unintended content.
This checker fetches a URL and inspects all the relevant meta tags. Missing tags are flagged. Tags with content that exceeds platform-specific length limits (Google snippet truncation, Twitter character caps) are highlighted. Image references are verified — if og:image points to a 404, the social preview will be broken.
All this matters because most clicks to your site come from search results and social shares. The meta tags are the marketing copy that decides whether a click happens. Getting them right is one of the highest-leverage SEO and social tasks.
Why Check Meta Tags
Meta tag mistakes are silent. A page with no og:image still loads correctly; nothing in the page tells you that social shares look broken. The mistake is only visible when someone shares the page, by which point the missed first impression is already lost. Routinely checking pages catches these issues early.
After major changes to a site — a redesign, a CMS migration, a template update — meta tags often regress. A QA pass on important pages confirms nothing critical was lost in the change.
Technical Details
Required meta tags for SEO: <title> (50-60 characters; Google truncates beyond this in search snippets), <meta name="description"> (150-160 characters; longer text gets truncated). Missing either degrades search appearance significantly.
Open Graph tags (used by Facebook, LinkedIn, Slack, and many others): og:title, og:description, og:image, og:url, og:type. og:image should be at least 1200×630 pixels for high-DPI rendering. og:image:alt is the accessibility label.
Twitter Card tags: twitter:card (typically summary_large_image), twitter:title, twitter:description, twitter:image. Twitter falls back to OG tags if Twitter-specific ones are missing, so well-configured OG often suffices.
Frequently Asked Questions
- What meta tags do I really need?
- Title, meta description, and og:image at minimum. Add og:title and og:description for explicit social control. Twitter card tags optional if OG is set.
- How long should the title be?
- 50-60 characters. Google truncates beyond this; titles that fit within the limit display fully in search results.
- How long should the meta description be?
- 150-160 characters. Beyond that, search engines truncate. Aim for 130-150 for safety against display variations.
- What size should og:image be?
- 1200×630 pixels is the standard. Larger is fine; smaller gets scaled up and looks blurry. 1.91:1 aspect ratio works across most platforms.
- Why does my Facebook share show the wrong image?
- Most often Facebook is using a cached version. Use Facebook's Sharing Debugger to clear the cache and re-fetch your page.
- Are meta tags case-sensitive?
- Property names are lowercase by convention. Most parsers are tolerant, but stick with lowercase for safety.
- Is my URL fetched from the browser or a server?
- Depends on the tool. Browser fetch may hit CORS issues; some tools use a server proxy to fetch and report back.
- What about JSON-LD structured data?
- JSON-LD is structured data for rich results, separate from meta tags. Most meta tag checkers focus on HTML head meta; structured data validators are a separate class of tool.