CSV Cleaner & Formatter
Clean messy CSV files instantly. Remove blank rows, trim whitespace, strip duplicate rows, fix delimiters, and preview the result before downloading. No uploads — processed locally.
Frequently Asked Questions
What does CSV cleaning actually do? +
CSV cleaning fixes common data quality issues: removing blank rows that break imports, trimming extra spaces from cell values, removing duplicate rows that skew analysis, and standardizing the delimiter (comma vs. semicolon vs. tab). A clean CSV imports correctly into Excel, Google Sheets, databases, and analytics tools without errors.
Why does my CSV open incorrectly in Excel? +
Usually one of three reasons: (1) The delimiter is semicolons instead of commas — common in European locales where commas are used as decimal separators. (2) The file has a different encoding (UTF-8 vs. ANSI). (3) Values with commas aren't properly quoted. Our cleaner lets you re-export with the correct delimiter.
How do I remove duplicate rows from a CSV? +
Enable 'Remove duplicate rows' in the options and click Clean. Our tool compares entire rows — a row is only considered a duplicate if every column value is identical. If you want to deduplicate by just one column (like a user ID), you'd need a more advanced tool like Excel's Power Query or Python's pandas library.
Is my CSV data safe? +
Yes. Your file is read directly in your browser using the JavaScript File API and never uploaded anywhere. The CSV data exists only in your browser's memory while you're using the tool and is discarded when you close the page or navigate away.