What Is a Meta Description? Definition, Length & CTR Best Practices

A meta description is an HTML meta tag that provides a short summary of a page's content. Google often — but not always — displays it as the gray descriptive text beneath the title in search results. The official line from Google is that meta descriptions are not a direct ranking factor. Their SEO value is almost entirely through click-through rate: a compelling description wins clicks from adjacent results at the same ranking position.

Length and Formatting

Aim for 140–160 characters on desktop; mobile truncates sooner. Google generates dynamic descriptions from on-page content when it finds the provided meta description irrelevant to the query, missing, or duplicated across many pages. Write descriptions that work as standalone ad copy for the page, not keyword lists.

What Makes Descriptions Click

Include a clear value proposition: what the reader learns, gets, or solves. Active voice outperforms passive. Specificity beats vagueness — "Step-by-step canonical tag audit with code examples" outperforms "Learn about canonical tags in this helpful guide." A call to action helps when natural: "Compare 12 free tools side by side."

Unique descriptions for every indexable page prevent Google from treating your site as low-effort template output. For large sites, prioritize descriptions on pages with highest traffic potential — homepage, top category pages, and money pages — before tackling long-tail blog archives.

Common Mistakes

Duplicating the title tag verbatim wastes the second line of SERP real estate. Double quotation marks in HTML attribute values can truncate descriptions early — use single quotes inside the content attribute or escape entities. Leaving descriptions empty on important pages cedes control to Google's auto-generated snippets, which often pull random body text including navigation labels and dates.

Meta descriptions sit alongside title tags, Open Graph tags, and structured data in the SERP presentation stack. For rewrite rates and a GSC CTR workflow, see meta descriptions & GSC CTR recovery. See our SERP optimization guide for the complete framework on controlling how your pages appear in search.