A meta description is an HTML attribute that provides a brief summary of a web page's content. It is placed in the page's <head> section and typically appears as the descriptive text beneath the title in search engine results pages (SERPs). While meta descriptions are not a direct ranking factor, they significantly influence click-through rates — they are essentially your ad copy in organic search results.

How Meta Descriptions Work

The meta description tag is written in HTML as: <meta name="description" content="Your description here.">. Google may display the meta description as the snippet in search results, but it frequently rewrites or replaces it with content pulled directly from the page — particularly when it determines the meta description does not accurately match the user's query. Google tends to use the written meta description more consistently when it accurately summarizes the page content and is well-written. Google typically truncates meta descriptions at around 155-160 characters on desktop and slightly less on mobile.

Key point: Google rewrites meta descriptions for approximately 70% of pages. Writing clear, accurate meta descriptions that precisely match the page content and user intent increases the likelihood Google will use your written version.

Best Practices for Meta Descriptions

An effective meta description achieves several goals simultaneously:

  • Keep it under 155-160 characters to avoid truncation in most search result displays
  • Include the primary keyword naturally — Google bolds matching words in snippets, increasing visual attention
  • Write a genuine, compelling summary of what the page offers the searcher
  • Include a value proposition or call-to-action where appropriate
  • Make each meta description unique — duplicate meta descriptions are a common technical issue
  • Match the searcher's intent — your meta description is a promise about what the page delivers

When Google Rewrites Meta Descriptions

Google commonly rewrites meta descriptions when the written description does not align with the user's query, is too short, is duplicated across pages, or contains information not representative of the page's full content. When Google rewrites descriptions, it typically uses content from the page's body text that is most relevant to the specific query being shown. This is one reason why having well-structured, clearly labeled sections on a page is valuable — it gives Google better material to work with when constructing dynamic snippets.

Why It Matters for SEO

While not a ranking signal, meta descriptions directly influence organic click-through rates — and click-through rate differences of even a few percentage points can translate to significant traffic gains at scale. A well-written meta description that accurately sets expectations also reduces bounce rates, as users who click know what they will find. Pages with unique, compelling meta descriptions consistently outperform pages with missing or generic descriptions in terms of CTR, making them worth investing time in across high-priority pages.