CSV Cleaner & Deduper
Clean rows, normalize whitespace, remove duplicates, split or merge columns, validate values, and export CSV or Excel.
Upload a messy CSV export and clean it up in one pass: trim whitespace, remove exact-duplicate rows, split or merge columns, validate values against a rule, and reorder or rename headers before exporting the result as CSV or Excel. Built for the kind of spreadsheet cleanup that normally means hours in a formula bar - deduplicating a contact list, splitting a full-name column into first and last, or catching malformed email addresses before an import.
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How it works
- 01
Upload your CSV file.
- 02
Apply cleanup steps: trim, dedupe, split/merge columns, validate.
- 03
Preview the cleaned data.
- 04
Export as CSV or Excel.
Details
- Category
- Developer & data
- Formats
- CSV
- Runs
- In your browser
- Files uploaded
- No
- Cost per run
- Free
- Sign-in
- Not required
- Works offline
- Yes, once loaded
Last updated 2026-08-03
Common questions
How are duplicate rows detected?
Rows are compared across every cell after the selected whitespace cleanup is applied. The header is never removed.
Does the file leave my browser?
No. Parsing, cleanup, validation, preview, and exports all run locally.
Can I preview changes before exporting?
Yes - the cleaned data is shown in a live table so you can verify results before downloading.
Is there a row limit?
There's no hard-coded row cap, but very large files are limited by your browser's available memory.