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List Cleanup Checklist Before Import

Trim, find duplicates, dedupe, sort, and split — a practical checklist before importing emails, keywords, or IDs.

14 August 2026 By Tools.Town Team 4 min read

Before importing emails, keywords, or IDs into a CRM, ESP, or sheet:

  1. Format — Comma Separated to List if the source is CSV-ish.
  2. Audit — Find Duplicate Lines to see what would collapse.
  3. Dedupe — Remove Duplicates from List (trim + case toggle as needed — see case-sensitive vs insensitive).
  4. Sort — Alphabetize, by number, or Text Sorter natural mode for versioned names.
  5. Batch — Split into chunks or groups when the importer has size limits or you need A/B arms.
  6. Diff — Compare Two Lists against the previous export when you need only-new or only-missing IDs.

Prefer List Lab when you want format → dedupe → sort → split in one pipeline.

Hub: List Ops. More concepts: Guides.

Frequently Asked Questions

Do I need every step every time?

No. Skip format if you already have one item per line. Skip split if you are importing the whole list in one go. Keep audit + dedupe for any merged export.

Should I sort before or after dedupe?

Either works. Sorting first makes duplicates easier to spot by eye; dedupe first reduces work for large lists. List Lab can run both in one pass.