CheckNumber.AI 
Line Checker
line $5 per 10,000 checks
- Core data available
- number, activated
- Best for
- APAC audience sizing and list cleaning
No-code CSV REST API Exportable results
Verify LINE Account Registration
Check whether a phone number is registered on LINE, the dominant messaging app across Japan and Southeast Asia.
LINE is the default messaging app across Japan, Thailand, and Taiwan, and a major channel in Indonesia — many consumers there treat a LINE account as more reachable than SMS or email. CheckNumber's LINE checker confirms whether a phone number holds a registered LINE account, so teams can size an APAC audience or clean a contact list before running LINE Official Account campaigns, without ever messaging the number.
E.164
Phone input
$5
Per 10,000 checks
CSV + API
Workflow
Submitted number +8190••••4567
LINE status yes / no
Line Checker Line Profile Checker No account, number, or SIM required
Every check runs through official platform APIs on our own infrastructure. You never connect, bind, or use your own account, phone number, or SIM card — just upload your list or call the API and get results.
What CheckNumber detects for Line
LINE account by phone
Confirms whether a phone number has a registered LINE account (yes or no).
APAC audience sizing
Every number in a LINE batch returns a registered or not-registered result for regional audience sizing.
Passive, no contact
Reads the LINE registration signal only — the account is never messaged, added, or notified.
What You Can Check
A focused LINE registration check
Use the LINE task when the required output is a row-level LINE-registration signal mapped to each submitted E.164 phone number.
Line Profile Checker
line_senior $15 per 10,000 checks
- Core data available
- number, activated, uid, nickname, gender, age, skin_color, hair_color, category, avatar
- Best for
- Authorised profile-enrichment review
| LINE product | Task type | Input | Core data available | Best for | Current price |
|---|---|---|---|---|---|
| Line Checker API documentation | line | Phone numbers in E.164 format | number, activated | APAC audience sizing and list cleaning | $5 per 10,000 checks |
| Line Profile Checker API documentation | line_senior | Phone numbers in E.164 format | number, activated, uid, nickname, gender, age, skin_color, hair_color, category, avatar | Authorised profile-enrichment review | $15 per 10,000 checks |
Core LINE data
What the LINE task returns
The result file maps one row to each submitted number with the fields below.
Registration
line - number
- The phone number supplied for the check, in E.164 format.
- activated
- Whether the number currently has a registered LINE account (yes or no).
Profile task output
line_senior - number
- The phone number supplied for the check, in E.164 format.
- activated
- The current LINE registration status returned by the line_senior task.
- uid
- The current LINE registration status returned by the line_senior task.
- nickname
- The current LINE registration status returned by the line_senior task.
- gender
- The current LINE registration status returned by the line_senior task.
- age
- The current LINE registration status returned by the line_senior task.
- skin_color
- The current LINE registration status returned by the line_senior task.
- hair_color
- The current LINE registration status returned by the line_senior task.
- category
- The current LINE registration status returned by the line_senior task.
- avatar
- The current LINE registration status returned by the line_senior task.
The line field is a boolean signal only — it does not include LINE display names, profile photos, or friend lists.
Run a LINE batch in three steps
Use the no-code platform for uploaded lists or the REST API for recurring workflows.
- 1
Prepare E.164 numbers
Provide one international phone number per row with country code.
- 2
Create the line task
Upload the file or call the API with task_type set to line.
- 3
Export mapped rows
Download the completed file and match each result to its source number.
Common Use Case
Improve Line list quality before outreach
Qualify leads before running LINE-based marketing or support campaigns in APAC.
No-code CSV REST API Exportable results
Signal 1
Regional reach check — confirm in bulk which numbers hold a registered LINE account across Japan, Thailand, Taiwan, and Indonesia.
Signal 2
Cleaner APAC lists — keep only real LINE users before launching LINE Official Account or CRM campaigns.
Signal 3
Privacy-safe — a passive check that never messages, adds, or notifies the account holder.
Line FAQ
Can I check phone numbers against LINE in bulk?
Yes. Upload a CSV of up to hundreds of thousands of numbers or call the REST API, then download one registered or not-registered result per number, billed only for successful checks.
Which countries is the LINE check most useful for?
LINE has its highest registration rates in Japan, Thailand, and Taiwan, with meaningful adoption in Indonesia. The check itself works on any submitted number — it simply reports whether that specific number holds a registered LINE account, regardless of country.
Does the check contact or notify the LINE user?
No. The check is passive and only reads the registration signal. The LINE account is never messaged, friend-requested, or notified.
Is there a free trial?
Yes. Contact our support team to claim 1,000 free checks for testing. After that every check is pay-as-you-go with no monthly fee, and the credits you top up never expire.