LINE referrer traffic
LINE is a messaging app dominant in Japan, Taiwan, and Thailand. Links shared in chats or LINE's news and timeline features open in its in-app browser, which usually sends no Referer header, so the traffic looks direct. UTM tags are the reliable way to attribute LINE-driven visits.
What this means
LINE is a messaging platform with chats, an official-account broadcast system, and timeline/news surfaces, used by a large share of users in Japan, Taiwan, and Thailand. When a link is shared in a LINE chat or surfaced in LINE's content features, taps open in LINE's in-app browser.
That in-app browser typically does not forward a Referer header to your site, so the visit looks like direct traffic unless the link itself carries identifying parameters. This is the same dark-social pattern seen across messaging apps.
Why the referrer is usually missing
Messaging apps generally do not expose the chat as a web referrer, and LINE's in-app webview is no exception. Even when a referrer is present it would only be line.me, never the conversation.
Tag links you distribute through LINE — for example via official accounts or campaigns — with utm_source=line and utm_medium=messaging. The query string travels with the URL into the in-app browser, so the visit is attributable to LINE even with no Referer header.
- Most LINE clicks arrive with no Referer header (in-app browser)
- Recommended tags: utm_source=line, utm_medium=messaging
- Without UTM, LINE shares fall into direct/dark social
How it appears in analytics and logs
A visit from a LINE chat link typically arrives with no referrer, because the in-app browser does not pass one. Without UTM tags it is indistinguishable from direct traffic; with them, you can confirm LINE as the source even though the Referer header is absent.
Diagnostic use case
Recover LINE-shared clicks that would otherwise be filed as direct, and distinguish messaging-app sharing from organic search in markets where LINE is a primary channel.
What WebmasterID can help detect
WebmasterID reads UTM tags server-side and groups LINE-tagged visits as a messaging channel, so shares in chats and LINE timeline stay separate from genuine direct traffic.
Common mistakes
- Assuming LINE traffic is organic direct when it is messaging-app sharing.
- Expecting a chat-level referrer — messaging apps never expose one.
- Distributing LINE official-account links without UTM tags.
Privacy and accuracy notes
Attribution relies only on UTM parameters you add and the absence of a Referer header. No LINE account, chat, or contact is identified. WebmasterID records the channel, not the conversation or the person.
Related pages
- Messaging app referrer (WhatsApp, Telegram, etc.)
Links shared in messaging apps such as WhatsApp, Telegram, and similar tools almost always reach your site with no web referrer. These private shares are a core form of dark social: real, often high-intent traffic that referrer reports cannot attribute. UTM tags are the only reliable measure.
- Dark social traffic explained
Dark social describes sharing that happens through private channels — messaging apps, email, copied links — where no referrer reaches your site. These visits are real but unattributed, so they inflate the direct bucket. UTM tagging on your own links is the practical way to expose some of it.
- Campaign links
Tag LINE links so chat shares are attributable despite a missing referrer.
Sources and verification notes
- LINE Corporation — AboutPlatform description; in-app browser referrer behaviour is a general messaging-app pattern.
- MDN — Referer header
Last reviewed 2026-06-24. Facts are checked against primary/official sources where available; uncertain specifics are marked “Data not yet verified” rather than guessed.