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CSV checker for Gmail mail merge

Remove duplicate emails, download a cleaned CSV and check your merge fields.

Use the tool

Free to use. Your CSV and sample message stay in this browser tab.

We count tool use, never inputs or results.

UTF-8 CSV: up to 1 MiB, 5,000 recipients and 100 columns.

Last matches ColdMerge's import behavior. We keep the whole chosen row, including blank fields. Matching ignores surrounding spaces and letter case; dots and +tags stay distinct.

Case-sensitive fields; fallback: {{company | your team}}.

Put your prepared campaign to work.

Import your contacts, review personalized messages and manage follow-ups from your own Gmail accounts.

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