Frequently Asked Questions

Question 1

Is this CSV duplicate remover really free?

Accepted Answer

Yes, this tool is 100% free with no limits. You can remove duplicates from as many files as you want without signing up or paying anything.

Question 2

Is my data safe?

Accepted Answer

Your data never leaves your browser. All processing happens locally on your device using JavaScript. We don't upload, store, or have access to your files.

Question 3

What determines if rows are duplicates?

Accepted Answer

Rows are considered duplicates if all the values in the selected columns are exactly the same. By default, all columns are compared, but you can choose specific columns to compare.

Question 4

What's the difference between case-sensitive and case-insensitive?

Accepted Answer

When case-insensitive (default), "John" and "john" are treated as the same value. When case-sensitive, they are treated as different values.

Question 5

Should I keep the first or last occurrence?

Accepted Answer

This determines which duplicate row to keep when duplicates are found. Keep first keeps the row that appears earlier in the file. Keep last keeps the row that appears later.

Question 6

Can I choose which columns to compare?

Accepted Answer

Yes! After uploading your file, you can select which columns should be used to determine duplicates. This is useful when you only want to dedupe based on certain fields like email or ID.

Question 7

What's the maximum file size?

Accepted Answer

You can process CSV files up to 10 MB in size.

Question 8

What CSV formats are supported?

Accepted Answer

This tool supports standard CSV files with comma, semicolon, or tab delimiters. The delimiter is automatically detected. The file must have a .csv extension.

CSV Duplicate Remover

Deduplicate CSV

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Frequently Asked Questions

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