Related tools JSON/XML Formatter & Validator Base64 Encoder & Decoder Regex Tester & Replacer

Processing limit: text/CSV files and input data up to 50 MB

Input

Open file

Output

Text cleanup options

Remove duplicate lines Remove empty lines Trim whitespace Sort lines

CSV cleanup and conversion options

Use first row as header Remove duplicate rows Trim cell whitespace Output as JSON

Helpful information

Clean up text lists, email lists, keyword lists, and CSV tables. Remove duplicates, trim whitespace, sort data, and convert between CSV and JSON in one place.

Uploaded files never leave your device. Processing uses your local computer only.

Opening a file reads its text in your browser. Original data is never sent to or stored by the MISCLAND server.

Q. How do I select CSV columns?

With a header, enter column names. Without a header, enter numbers starting at 1. For example: name,email or 1,3

Q. What should I do if a CSV is parsed incorrectly?

Change the delimiter to match the actual file: comma, tab, semicolon, or pipe.

Q. Can it convert JSON to CSV?

This tool can convert CSV to JSON. Use the JSON/XML Formatter to format and validate the JSON output.

Q. Can it handle large files?

Processing happens in browser memory, so very large CSV files may take longer.

Clean up email lists: Remove duplicate lines and extra spaces to clean up mailing lists.

Clean up CSV: Remove duplicate rows and keep only the columns you need to create a smaller file.

Review JSON: Convert CSV to JSON, then format and validate it with the JSON/XML Formatter.

Copy quickly: Use Copy output to paste cleaned data immediately.

Yes. Select only the columns you need first; rows with exactly the same combination of selected column values are removed as duplicates. Unselected columns are omitted from the result, so this tool does not keep the full row while using only one column as a dedupe key.

Remove Duplicate Lines / CSV Duplicate Rows - Text & CSV Cleaner

Text cleanup options

CSV cleanup and conversion options

Helpful information

What types of data can I clean up?

Where are uploaded files processed?

Frequently asked questions (FAQ)

Tips

Can I remove CSV duplicates based on specific columns?