CSV Cleaner

Trim cells, choose columns and remove duplicate rows. Preview the result before downloading a clean file.

Example loaded. JavaScript processes it locally.

Review the output before using it.

Know what happens to your data.

Trimming happens before blank-row removal, column selection and exact deduplication. Column selection uses comma-separated exact header names. Spreadsheet protection changes formula-like cell text.

Practical limits

Inputs up to 1 MiB, 80 nested levels and 50,000 structured values. CSV supports up to 10,000 data rows and 200 columns. Very large jobs time out so your browser stays responsive. Uploaded files must be UTF-8 text.

Nothing is submitted to a processing server or saved as input history. Copy or download your result before leaving the page. Read the privacy details.