Which Language Should x-default Point To?
x-default should point to the version you most want a user to land on when they belong to none of your tagged languages — most international sites point it at the English version, sites with a language-selector page point it at the selector, and sites serving only a Chinese-speaking market can point it at their main Traditional or Simplified version. There’s no single right answer, but there is a clear decision logic.
What is x-default?
x-default is a special hreflang value Google introduced in April 2013. Its job is to name a fallback page: when a searcher’s language or region matches none of the versions you’ve tagged — say a German speaker finds your three-language site — Google serves whatever URL x-default points to. Think of it as the default: branch in a switch statement.
In markup it looks like this (note that x-default is not a language code, and a single set of tags can only carry one of it):
<link rel="alternate" hreflang="zh-Hant" href="https://example.com/zh-hant/schema-guide/" />
<link rel="alternate" hreflang="zh-Hans" href="https://example.com/zh-hans/schema-guide/" />
<link rel="alternate" hreflang="en" href="https://example.com/en/schema-guide/" />
<link rel="alternate" hreflang="x-default" href="https://example.com/en/schema-guide/" />Comparing the three targeting strategies
| Strategy | x-default points to | Who it suits | Risk |
|---|---|---|---|
| International lingua franca | The English page | Has an English version, targets include international markets | Almost none — the most common choice |
| Language-selector page | The / language-entry page |
More than 3–4 languages, no clear dominant market | The selector page itself is thin content — avoid letting it become an empty shell |
| Primary-market version | The Traditional (or Simplified) Chinese page | Serves only a Chinese-speaking market, no English version | Poor experience for non-Chinese users, but they were never the target audience anyway |
The decision flow: three questions
- Do you have an English version? Yes → point x-default at English, done. It’s the answer least likely to go wrong for “everyone else,” and it’s the standard move for most three-language sites (Traditional / Simplified / English).
- No English version, but you have a language-selector page? Yes → point it at the selector. Just make sure the selector page is indexable and isn’t a pure-JavaScript redirect.
- Neither? Point it at your primary language version. For a Traditional-plus-Simplified-only site, aim x-default at the Traditional version — this beats leaving it unset, because it also removes the ambiguity of “which version is the default.”
Common x-default mistakes
- Forgetting to set it. x-default isn’t mandatory, but without it Google has to guess when facing a user in an untagged language — and a Traditional/Simplified site can get guessed wrong.
- Setting more than one x-default. A single set of hreflang tags can carry only one x-default; two or more scrambles the whole set of signals.
- Pointing it at a URL that auto-redirects. Some sites’ root URL auto-302s to a language version based on IP. Aiming x-default at that kind of URL is aiming at a spot where Google can’t crawl stable content.
- Setting it only on the homepage. Like every other hreflang tag, x-default should be emitted on every page that has multilingual versions, pointing to that page’s corresponding default version — not with the whole site pointing back at the homepage.
FAQ
Q1: Is x-default required? What happens if I skip it? It’s not required — hreflang works without an x-default. But skipping it hands “which version does an uncovered-language user see” over to Google’s guess. Adding one line costs almost nothing, so it’s worth setting every time.
Q2: Can x-default and a specific language version point to the same URL?
Yes, and it’s the most common setup — for example hreflang="en" and hreflang="x-default" both pointing at the English URL. The two lines coexisting is completely valid.
Q3: A Chinese-only site with no English version — should x-default point to Traditional or Simplified? Point it at your primary-market version. If Taiwan is the main market, point to Traditional; if overseas Simplified readers are the bigger share, point to Simplified. Decide by which language folder’s impressions and conversions matter more in Google Search Console.
Q4: Does x-default affect rankings? Not directly. Like the rest of hreflang, it’s a routing signal that decides “who sees which version” — it doesn’t change the page’s own ability to rank.
x-default is only one line, but every page has to emit it alongside the full hreflang set — GeoSeoToday’s hreflang generator and GEO checker attaches the correct x-default automatically when it builds the tags, so you never have to judge the format by hand. For the wider picture of getting AI to cite you across languages, see Multilingual GEO: Getting AI to Cite You in Every Language.