Article summary
What to Prepare Before a Zalo Number Check: List and TXT Checklist: task scope, TXT input, Excel output fields, and validation boundaries.
A Zalo check requires a valid list and a clear task, not five account tricks. Account status does not replace list provenance and permission.
What this task actually answers
A Zalo check requires a valid list and a clear task, not five account tricks. Account status does not replace list provenance and permission. Define the business question first and select the smallest service that answers it.
Prepare phone numbers before upload
Start with a list that has a documented source and permitted purpose. Verify country codes, deduplicate, remove spaces, brackets, hyphens, names, and notes, then save one phone number per line in TXT. Excel and CSV are not accepted upload formats.
Use the TXT-to-Excel workflow
Submit a small sample to the selected Zalo task. Record the service, input row count, operator, and check date. Export Excel when processing finishes, preserve the raw result, and match it back to the CRM by original number or internal ID.
Interpret output fields correctly
Zalo Registration Check and Activity Check are separate tasks. Activity results may include phone number, user ID, activity time, nickname, and active days; demographic fields belong to a different task.
The check most teams miss
Verify country codes, deduplicate, remove other columns, and create a TXT file with one phone number per line. Validate the task and fields on a small sample first.
What the result cannot prove
Registration or activity signals do not prove identity, marketing consent, purchase intent, or a fixed conversion outcome. Pictures, nicknames, age, and gender must not be expanded into unsupported sensitive inferences.
Delivery and review checklist
Keep the source TXT and exported Excel. Reconcile input and output rows, exceptions, and missing values. Record provenance, purpose, check date, access, and deletion timing. Review the current fields on the Zalo service page.
