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Remove Duplicates from CSV, Excel, and Google Sheets

Clean messy data in seconds — across all columns or just the ones you pick

Remove duplicate rows from any spreadsheet — CSV, Excel, or Google Sheets. Check all columns or just the ones you select. Choose whether to keep the first or last occurrence. Runs in your browser, no upload.

Use the tool

How it works

Step 1
Connect your data
Upload CSV, Excel, or TSV, pick a Sheet from Google Drive, run a BigQuery query, or pull from a REST API.
Step 2
Choose the columns to check
Match duplicates across all columns, or pick specific columns to use as the deduplication key.
Step 3
Keep first or last + download
Choose whether to keep the first or last occurrence of each duplicate, then download the clean file.

Want to schedule this, not just run it once?

Removing duplicates from the same data every week? Sheetgo can run this automatically — clean a live Google Sheet every time new rows arrive, and sync the clean version to a master report, Excel file, or dashboard.

Get Sheetgo on Google Workspace Marketplace

Frequently Asked Question

Dive deeper into removing duplicates from spreadsheets

Get the answers to your questions about deduplicating data

Does it compare all columns, or can I choose?

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Both. By default, duplicates are detected when every column matches. You can also pick a subset of columns (for example, just the email column) to use as the deduplication key.

What happens to duplicate rows?

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You choose: keep the first occurrence and drop the rest, or keep the last occurrence and drop the earlier ones.

Is my data uploaded anywhere?

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No. The cleanup runs entirely in your browser.

Can I dedupe data from BigQuery or an API?

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Yes. Connect your BigQuery query or a REST API endpoint and apply the same deduplication logic on live data.

What else can I do with the Sheetgo add-on?

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Beyond scheduled automation, the Sheetgo add-on — powered by Sheetgo Workflows — can send personalized emails from spreadsheet rows, generate Google Docs or PDFs as mail-merge outputs, chain multiple processing steps into one flow (for example: filter → merge → dedupe → email), and orchestrate approvals across teams. Everything runs unattended once set up. One-click install from Google Workspace Marketplace.

Which data sources can I connect to with Sheetgo?

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With the Sheetgo add-on, your automated flows can pull from Google Sheets, Excel, CSV files in Google Drive, BigQuery (with live SQL queries), and any REST API using Bearer Token, API Key, or Basic authentication. The output can land back in a spreadsheet, a generated Google Doc or PDF, an email, or any combination chained in a Workflow.

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