CSV Cleaner
Free online CSV cleaner. Remove empty rows, deduplicate rows, trim whitespace, fix stray quotes, strip BOM, and drop empty columns. RFC-4180 compliant, 100% client-side, no upload.
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What is CSV Cleaner?
The CSV Cleaner is a free, browser-based tool for tidying up CSV data. It removes empty rows, deduplicates rows, trims whitespace, fixes stray quote marks, strips the UTF-8 BOM, and drops fully-empty columns — all without uploading your data anywhere.
Key Benefits
- 100% client-side — no upload, works offline, safe for sensitive data.
- RFC-4180-aware parser handles quoted fields, embedded delimiters, and embedded newlines.
- Independent toggles let you run exactly the cleaning steps you need.
- Header-aware deduplication keeps your column titles intact.
- Live preview table and one-click download as a UTF-8 .csv file.
Common Use Cases
- •Cleaning messy CSV exports before importing into a database or spreadsheet.
- •Removing duplicate records from a customer or product list.
- •Stripping whitespace and BOM artifacts from CSVs saved by different editors.
- •Tidying survey or form data that contains blank rows and columns.
How to Use the CSV Cleaner
- Paste or upload your CSV: Paste CSV data into the editor, or click Upload to load a .csv or .txt file. You can also click Sample to try a demo dataset.
- Pick the delimiter: Select the correct delimiter for your data: comma, semicolon, tab, or pipe. The parser uses RFC-4180 rules.
- Toggle cleaning options: Turn on the cleaning steps you need: trim whitespace, remove empty rows, remove duplicate rows, remove empty columns, collapse spaces, fix quotes, strip BOM.
- Copy or download: Review the live preview and stats, then click Download to save the cleaned .csv file or Copy to copy it to your clipboard.
Key Features
- Remove empty rows, duplicate rows, and fully-empty columns with independent toggles.
- Trim leading and trailing whitespace from every field automatically.
- Collapse runs of multiple spaces into a single space for tidy data.
- Strip the UTF-8 BOM and fix stray leading or trailing quote marks.
- Header-aware deduplication keeps the first row while removing duplicate data rows.
- RFC-4180 parser handles quoted fields, embedded delimiters, and embedded newlines.