Line checker line: use cases, compliance & integration

Line checker on Cheker.pro: file upload → CSV, no manual number probing.

Line Checker (line) is Cheker.pro bulk Line verification. This guide covers mass phone checks, line API, phone intelligence, list hygiene before SMS/messengers, and CSV export for CRM.

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Who it is for

Line Checker is used by SMS hubs, performance marketing, crypto compliance, call centers and SaaS with Reseller API. If your pipeline segments «has Line / not» — this task type covers bulk at scale.

What Line Checker does

Line account verification. Each input line becomes one CSV row with result fields.

Task type: line. Family: Line. Input type: phone.

Pricing and output on Line Checker landing. Run tasks in dashboard.

Input file format

Upload TXT or CSV: phone numbers in international format (E.164 recommended, e.g. +14155552671). One file = one country only (country code in every line: Brazil 55, US 1, Russia 7).

• Minimum: 2,000 lines per task
• Maximum: 10,000,000 lines (large files auto-split)
• E.164 recommended: +country code, no spaces or brackets
• See format preview in the upload form at Line Checker

Do not mix phone, email and username in one file. From Excel export a single column to CSV — avoid formulas and scientific notation.

Output fields

• Number
• line: yes/no

Interpret Number · line: yes/no with a clear rule: «yes» → Line channel candidate; «no» → SMS/email fallback or exclude from campaign.

Use cases

• CRM enrichment before look-alike campaigns.
• Marketing runs a separate sequence for "Line: yes".
• CRM enrichment before look-alike campaigns.

How to run a check

1. Sign up at Cheker.pro and top up USDT
2. Open Line Checker — TXT/CSV upload form
3. Wait for completion in «Мои задачи»
4. Download CSV into CRM / SMS hub / BI
5. Automation: Reseller API — line

Common mistakes

• Local format without country code → false «no» results.
• Mixed countries in one file → API rejection or wrong output.
• Confusing Line registration with «number is reachable» — different signals.
• Treating «no» as permanent block without re-check after 7–14 days.
• Bulk-check without legal basis (GDPR / local telecom rules) — validation does not replace consent.

Reading yes/no

"No" on Line may mean no account, privacy settings, or upstream lag. Do not auto-block on one field alone.

Related Line checkers

• Line Age & Gender Checker (line_senior) — Detect Line account age, gender and profile information

FAQ

How is Line Checker different from other Line checkers?

Task type line: Line account verification. Output: Number · line: yes/no. Compare family variants in the checker catalog and line landing.

Minimum batch size and file format for line?

Minimum 2,000 lines. phone numbers in international format (E.164 recommended, e.g. +14155552671). One country per file. Format hints on the upload page.

How much does Line Checker cost?

Pay-as-you-go USDT: per-line billing at checker rate. Current price per 10k lines on the line card and dashboard after top-up.

API for Line Checker?

Yes. Reseller API: POST /api/v1/check with task type line. Keys: API keys, docs: /docs.

Is bulk checking legal?

Use only lists with opt-in or other lawful basis (GDPR, local rules). Cheker.pro acts as processor on your instructions; you define retention and consent policy.

Summary: Line Checker is the bulk layer for Line. Catalog: line · run → · Cheker.pro blog