LINE Number Checker — Bulk Verify Numbers on LINE
Check LINE registration and profile attributes for number lists.
What is LINE?
LINE is a messaging and social app that has grown into a "super-app" — free text, voice and video calls and stickers, plus mobile payments, news, shopping and more. In its core markets it functions as everyday infrastructure rather than just a chat app.
Official site: line.me · Developed by LY Corporation (originally NHN Japan / Naver) · Launched 2011
History
LINE was created by NHN Japan (a subsidiary of South Korea’s Naver) and launched in June 2011, in response to the March 2011 Tōhoku earthquake, when Japan’s phone and SMS networks were overwhelmed. It quickly became Japan’s largest social network, and in October 2023 its operator merged into LY Corporation, the current company behind LINE and Yahoo! Japan.
How many people use LINE?
LY Corporation reported about 193 million global monthly active users as of March 2026 (194 million a year earlier). Its four largest markets — Japan, Thailand, Taiwan and Indonesia — account for roughly 75% of that total, and in Japan LINE is used by over 70% of the population.
Sources: LY Corporation — official global figures, Wikipedia — LINE
Who uses LINE?
LINE is a mass-market app used by the general public in its core Asian markets for messaging, calls and stickers, and increasingly for payments (LINE Pay), news and shopping. Businesses reach customers through LINE Official Accounts and advertising, especially in Japan, Thailand and Taiwan.
Where LINE is used
LINE dominates messaging in Japan, Taiwan and Thailand and is a top-four market presence in Indonesia. Japan alone accounts for about 100 million monthly active users, roughly half of LINE’s global base, with Thailand and Taiwan the next largest.
- Japan
- Thailand
- Taiwan
- Indonesia
A LINE number check tells you which phone numbers in a list are actually connected to LINE — before you spend budget messaging or advertising to them. You upload a list of numbers, we verify each one against LINE, and you download a clean report marking which are registered and which are not. Nothing is ever sent to the numbers you check, so the people on your list are never contacted or notified during verification.
LINE checking here confirms registration status: whether each number is tied to a LINE account. It is the fastest way to strip numbers with no LINE presence out of a list before you act on it.
Every check is priced per number and the rate is shown before you run anything, so a large list has no surprise cost. Results come back as a downloadable report you can feed straight back into your CRM, dialer or ad audience.
New to list hygiene? Start by cleaning your file with the free list cleaner or checking a single number in the number lookup. If you also message on other platforms, see the Telegram checker or the full LINE check tiers below.
How LINE number checking works
Upload your list
Bring your numbers as a plain list — any common format. They are normalised to E.164 (correct country code and national length) so malformed rows do not silently fail.
Checked against LINE
Each number is verified against LINE for the tiers you selected — registration and, where available, activity and profile signals.
Download a clean report
You get a per-number report marking each result, ready to import back into your tools. The people on your list are never messaged during the check.
LINE checks, tiers & pricing
| Check | Tier | Returns | Price / number | Per 10,000 | Action |
|---|---|---|---|---|---|
| LINE Registration Check | Registration | Registration status | $0.00108 | $10.80 | Check now |
| LINE Gender | Profile | Gender | $0.0017 | $17.00 | Check now |
Estimate your LINE check cost
Checks are billed per number at the lowest tier — no subscription, no minimum. Enter a list size to see the cost.
Check LINE numbers via API
Prefer to automate? Every LINE check here is also available through the psyke Reseller API — submit a list, poll for completion, and download results programmatically. Requests authenticate with a single API key header, and each check maps to a service code you pass in the request:
line-registeredLINE Registration Checkline-genderLINE Gender
See the full API reference, the services catalog, and rate limits & billing — or grab the OpenAPI spec to generate a client.
Who uses a LINE check
For marketing teams
Clean a list before a LINE broadcast so budget only goes to numbers that can actually receive it — and deliverability metrics stay honest.
For sales & lead gen
Qualify inbound leads by confirming a LINE presence before routing them to reps, so time is spent on reachable prospects.
For fraud & risk
Flag numbers with no LINE footprint during onboarding or verification, adding a low-cost signal to your risk checks.
For data & RevOps
De-duplicate and validate CRM exports so dashboards are not skewed by dead or unreachable contacts.
Where LINE is used
Top markets by published penetration research. Each percentage is measured against the base its source states — internet users, survey respondents, population or smartphone owners — so read every figure with its source.
- Taiwan94%LY Corp via Business of Apps 2025 - 22M MAU, ~94% of population
- Thailand90.6%Digital 2025 Thailand (Meltwater/We Are Social) - % of internet users 16+
- Japan79%LY Corporation Aug 2024 - 97M MAU, ~79% of total population
What the research says
LINE counts 97 million monthly active users in Japan - roughly 79% of the entire population - and is the country's default channel for personal, business and government communication.
LY Corporation, Aug 2024Taiwan is LINE's second stronghold: about 22 million monthly active users, equivalent to ~94% of the population.
LY Corp via Business of Apps, 2025
How this LINE check treats your list
Numbers are never messaged
A LINE check is a passive lookup. The people on your list are never contacted, messaged or notified — verification leaves no trace on their side.
Priced per number, shown upfront
No subscription and no minimum. You see the per-number rate before you run anything, so a large list has no surprise cost.
You keep the results
Results come back as a downloadable report you own — import it straight into your CRM, dialer or ad audience. We do not resell or reuse your list.
FAQ
What does the LINE checker return?
Depending on the tier you pick: Registration status; Gender.
How much does LINE checking cost?
From $0.00108 per number ($10.80 per 10,000 numbers), billed per checked number.
Will the numbers I check be notified?
No. Checks are passive lookups — no message or notification is sent to the checked numbers.
Can I check LINE numbers in bulk?
Yes — upload your list in the psyke app, pick a tier, and download the results as a report when the bulk run finishes.
How widely is LINE used?
In country-level research, some of its strongest measured markets are Taiwan at 94% (LY Corp via Business of Apps 2025 - 22M MAU, ~94% of population); Thailand at 90.6% (Digital 2025 Thailand (Meltwater/We Are Social) - % of internet users 16+); Japan at 79% (LY Corporation Aug 2024 - 97M MAU, ~79% of total population).
Which countries use LINE the most?
The strongest published figures in our source data: Taiwan (94% — LY Corp via Business of Apps 2025 - 22M MAU, ~94% of population); Thailand (90.6% — Digital 2025 Thailand (Meltwater/We Are Social) - % of internet users 16+); Japan (79% — LY Corporation Aug 2024 - 97M MAU, ~79% of total population). Each percentage is measured against the base its source states — internet users, survey respondents, population or smartphone owners — so figures are only directly comparable within one source.