How to use CSV Cleaner
- Load CSV and specify its input and output delimiters.
- Select only the cleanup operations you want.
- Review the before/after summary and bounded preview before downloading.
CSV Cleaner
Apply selected structural cleanup operations to CSV and download a reviewed result without changing data types.
Private by design. CSV and JSON stay in browser memory in this tab. Nothing is uploaded, logged, saved, or executed.
Maximum 16 MB · 50,000 rows · 500 columns · 1,000,000 characters per cell.
Add CSV data, then process it.
Clean whitespace, empty structures, or exact duplicate rows through individually selected operations.
How OpenFileTools processes it
Local processing, explicit choices.
One shared deterministic parser handles UTF-8, BOM, quoted fields, escaped quotes, embedded line breaks, and explicit delimiter modes. Cells render only as text, and output is created locally after review.
Questions, answered.
Does the cleaner rewrite my values automatically?
No. It performs only the operations you explicitly select and reports structural changes.
Is the source uploaded?
No. Source data and generated output remain in browser memory in this tab.
Related guide
Read the related guide