Delimiter detection
Automatically reads comma, semicolon, tab, and pipe-separated files.
Offline data utility
Messy CSV in.
Clean data out.
Normalize headers, trim cells, remove blank rows and exact duplicates. Nothing is uploaded. No account, installation, or subscription.
Before
Customer Name ↕
Ana Torres
Ana Torres
empty row
After
customer_name
Ana Torres
Luis Pérez
Mei Chen
96%data completeness3 issues fixed
Zero uploadsYour CSV never leaves the browser.
One fileWorks offline on Windows, Mac, and Linux.
UTF-8 readyExports cleanly to Excel and Google Sheets.
Live private demo
Paste a sample. See the cleanup.
Limited to 25 data rows. Processing happens only in this tab.
Messy CSV5 rows
Clean preview1 removed
| customer_name | order_total | |
|---|---|---|
| Ana Torres | ana@example.com | 120.50 |
| Luis Pérez | luis@example.com | 89 |
| Mei Chen | mei@example.com | 240.00 |
Full version exports every cleaned row as a UTF-8 CSV.
Built for real exports
Five common cleanup jobs. One offline tool.
Consistent headers
Converts irregular column names into dependable snake_case.
Duplicate removal
Finds and removes exact duplicate rows without touching the source.
Column insights
Recognizes likely dates, emails, numbers, integers, and booleans.
Private export
Downloads the complete cleaned dataset as an Excel-friendly UTF-8 CSV.
No maintenance
No login, API key, monthly bill, telemetry, or internet connection.
CSV Cleanroom 1.0
Keep the tool.
Keep your data private.
$12 USD · one-time
- Unlimited local CSV cleaning
- Full-file export and 100-row preview
- Commercial internal-use license
- Free 1.x updates