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Importing contacts in bulk without breaking your list
June 24, 2026 · 5 min read
Tutorial cover — spreadsheet
Field mapping, deduplication and the CSV formatting rules that keep an import clean.
Format the file
Use UTF-8 encoding and keep one recipient per row. Merge cells and multi-line addresses in a single column are the two most common import failures.
Map the fields
Map every column explicitly rather than accepting automatic detection — automatic mapping tends to guess wrong on second address lines.
Run a test batch
Send ten cards to internal addresses first. It costs almost nothing and catches everything.