Google Sheets / 5 min read
How to Remove Duplicates in Google Sheets
Clean repeated rows in Google Sheets without losing important columns or breaking later summaries.
To remove duplicates in Google Sheets safely, first decide which columns define a true duplicate, then preserve the raw data before deduplicating.
Check this first
- Back up the raw tab before deleting rows.
- Choose the correct duplicate key, not just one visible column.
- Check whether near-duplicates should stay separate.
- Re-run summary formulas after deduplication.
Why duplicates are tricky
Duplicate rows often look simple until you realize that some repeated values are real repeat events, while others are import mistakes. The cleanup step only works if you decide what counts as a true duplicate first.
That is especially important in sales, CRM, and operations sheets where one ID may repeat across legitimate transactions.
A safer cleanup workflow
Preserve the raw tab, then either use the built-in remove duplicates command on a working copy or create a formula-based deduplicated view. This makes it easier to compare counts before and after the change.
- Keep a raw backup tab.
- Pick all columns that define the duplicate logic.
- Audit totals after removing duplicates.
Why this matters for later formulas
Duplicate rows distort counts, sums, and dashboards. Removing them early makes later COUNTIF, SUMIF, and lookup logic much more trustworthy.