A SERP snippet is the title, URL and description shown for one result on a search engine results page: a clickable title line, a URL or breadcrumb line underneath, and one or two lines of description text. It has existed since the earliest days of web search, but it matters in a new way now, because the same title and description fields, and the same underlying page content, are often what an AI answer engine draws on when it decides how to present your page as a cited source.
The three fields that build a snippet
- Title: usually pulled from the page's
<title>tag, though Google sometimes rewrites it based on the query or the page's own headings if it judges the written title to be a poor match. - URL or breadcrumb line: the page's address, sometimes shown as a readable breadcrumb path instead of the raw URL.
- Description: usually pulled from the meta description tag, but frequently rewritten or replaced entirely with a different excerpt from the page if Google judges that excerpt to answer the specific query better than the written description does.
That last point is worth sitting with: writing a meta description does not guarantee it will be shown as written. It is a strong suggestion, not a locked-in snippet. The same is broadly true of how an AI answer engine picks the passage it quotes or summarizes; it draws on whatever part of the page content best answers the question, not necessarily the exact text you wrote for a meta tag.
Length: a guide, not a hard rule
Two numbers get repeated often enough that they sound like fixed rules, and neither is exactly one:
- Titles are truncated by pixel width, not character count, roughly around 580 pixels on desktop. Because letters vary in width, this comes out to somewhere around 50 to 60 characters depending on which letters are used. A title full of narrow letters (i, l, t) fits more characters before truncation than one full of wide letters (W, M, O).
- Meta descriptions are generally shown up to somewhere around 150 to 160 characters, though this shifts by device (mobile snippets often show less) and by what Google decides to display for a given query.
Treat both as practical guides for writing a snippet that is unlikely to get cut off mid-thought, not as an exact technical cutoff you need to hit precisely. Writing to "exactly 60 characters" as if it were a hard limit overstates a precision that does not exist; write a clear, complete title and description that happen to fit comfortably within the guide, and do not sacrifice clarity to hit an exact number.
How this connects to AI answer previews
When an AI answer engine cites a page, it typically shows some combination of the source's title, domain, and a short quoted or summarized snippet, formatted differently from a traditional search result but built from largely the same underlying signals: what the title says the page is about, and what passage of the page content best answers the question being asked. A title that clearly and specifically states what the page covers, and an opening paragraph that states a direct, quotable answer, do double duty: they help a traditional SERP snippet read cleanly, and they give an AI system a clean, well-formed passage to quote or summarize.
This is exactly why length and clarity checks are useful for both surfaces at once, and why we built one tool that previews both rather than two separate ones.
Writing titles and descriptions that hold up on both surfaces
- State what the page is about specifically, not generically. "AI Agent Development Timeline: How Long It Actually Takes" beats "AI Agents Guide."
- Write the description as a real sentence or two that could stand alone as an answer, not a comma-separated list of keywords.
- Keep both within the approximate length guides so they are unlikely to be cut off mid-word, checked visually rather than by counting characters alone.
- Make sure the opening paragraph of the actual page states a similarly direct claim, since that is often what gets pulled instead of (or alongside) the written meta description. See our guide to answer-first content for AI search.
Our free SERP and AI snippet preview tool lets you type a title, meta description and opening paragraph, see live length warnings against the approximate guides above, and preview both a Google-style search result and a simplified AI answer card side by side.
Sources: Google Search Central on title links, Google Search Central on snippets.