OFFICE🧹Excel Dedupe

Excel Dedupe: Multi-Column Composite Match + Export xlsx

This tool deduplicates Excel rows by a multi-column composite key (not just a single column). You can keep the first, last, or all rows of each duplicate group, and export a spreadsheet that preserves the original styling.

Typical scenarios: ① dedupe customer or order lists by "phone + name" (a single phone column may be shared by many people); ② merge data from multiple sheets; ③ identify multi-row items of the same order by "order number + SKU" (this is legitimate and should not be deduped).

How to use: ① upload the spreadsheet; ② select the sheet; ③ pick the key columns from the headers (e.g. "customer phone", "email"); ④ choose a keep policy (first = drop later duplicates; last = drop earlier ones; all = mark only, for manual review); ⑤ download the result.

Notes: ① blanks count as a value — two rows that are both blank are considered equal; set that column to "ignore" if needed; ② numbers, dates, and text are normalized before comparison (e.g. 2024-01-01 and 44927 are treated as equal); ③ header names must match exactly — synonyms with different names (e.g. "phone" vs "mobile") are not merged automatically.