CSV Cleaner
Clean CSV data by trimming spaces, fixing rows, and removing duplicates.
Upload a CSV, TSV, or TXT file
Drop a file here, or choose a file. The delimiter is detected automatically.
Accepted: .csv, .tsv, .txt
Paste CSV, TSV, pipe-delimited, or semicolon-separated text. Processing happens locally in your browser.
Review warnings before importing cleaned CSV into a spreadsheet, database, CRM, or no-code tool.
Choose what happens to rows whose column count does not match the header. Values are never shifted between columns or guessed.
Total input rows
7
Parsed rows before cleanup.
Header columns
4
Expected columns per row.
Valid rows
4
Data rows matching the header width.
Malformed rows
2
Rows with a different column count.
Duplicates removed
1
Later identical rows removed.
Empty rows removed
1
Blank rows removed.
Output rows
6
Rows in the cleaned output.
Output columns
5
Mixed — malformed rows preserved.
Input delimiter
Comma
Detected or selected.
Output delimiter
Comma
Used when serializing.
2 malformed rows detected
Row 6
Expected 4 cells, found 3. Missing 1 trailing cell
Row 7
Expected 4 cells, found 5. Extra value: EXTRA
Validation notes
- • 2 malformed rows detected: keep and flag policy applied.
- • 2 malformed rows remain in the output, so the table is not a fully consistent grid. Review before importing.
Local processing
CSV cleanup runs in your browser. Files are read locally and never sent to a server.
Import friendly
Normalize delimiters, row structure, and quotes before imports.
Spreadsheet ready
Prepare text for Excel, Google Sheets, CRMs, and CSV-to-JSON tools.
Dynamic Cleanup Insights
How CSV Cleaning Works
CSV cleaning prepares raw comma-separated or delimiter-separated data for spreadsheets and imports.
Cleaning can remove extra spaces, blank rows, duplicate records, and inconsistent line endings.
Delimiter conversion can make CSV easier to paste into Excel, Google Sheets, databases, or import tools.
Quoted fields protect values that contain commas, quotes, or line breaks.
Common CSV Problems Explained
Delimiters, Quotes, and Headers Explained
Comma
The most common CSV delimiter.
Semicolon
Common in some regional spreadsheet exports.
Tab
Often used for TSV data.
Pipe
Common in some system exports.
Quoted fields
Allow delimiters, quotes, or line breaks inside values.
Headers
Describe column names and make imports easier to map.
Spreadsheet and Database Import Use Cases
Common Cleanup Examples
Trim spaces
Before: name , email → After: name,email
Remove blank lines
Delete empty rows from pasted spreadsheet text.
Convert delimiters
Convert semicolon-separated CSV into comma-separated CSV.
Preserve quoted names
"Smith, John" stays in one cell.
Remove duplicates
Keep the first exported row and remove repeated rows.
Normalize line endings
Convert mixed CRLF, CR, and LF endings into consistent output.
Privacy and Local Processing Notes
Pasted CSV is processed locally in your browser.
No account is required, and this tool does not add backend storage.
Avoid pasting sensitive production data unless necessary.
This tool is intended for lightweight cleanup, formatting, and import preparation.
Method Explanation
- 1Read the pasted CSV text.
- 2Detect or use the selected delimiter.
- 3Parse rows while preserving quoted fields.
- 4Trim whitespace if enabled.
- 5Remove empty rows or columns if enabled.
- 6Remove duplicate rows if enabled.
- 7Normalize delimiters and line endings.
- 8Quote and escape values when needed.
- 9Output clean, copy-ready CSV.
Frequently Asked Questions
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Related reading
Learn the formula, assumptions, examples, or context behind this tool.