Clean messy CSV data in seconds.
Trim whitespace, remove empty rows, deduplicate records, and fix column inconsistencies — all in your browser with no uploads.
How it works
Three simple steps
Open your CSV
Drag and drop a messy CSV file into the editor.
Apply cleaning actions
Trim whitespace, remove empty rows, deduplicate, and clean column values.
Export clean data
Download the cleaned file as CSV, Excel, or JSON.
Key features
Everything you need
Trim whitespace
Remove leading and trailing whitespace from cells across all columns.
Remove duplicates
Find and remove duplicate rows to keep your data set clean.
Remove empty rows
Strip out blank or incomplete rows that clutter your spreadsheet.
Edit and review
Manually review and edit any remaining issues in the grid.
Your data stays on your device
SheetTool processes everything locally in your browser. Your files are never uploaded to a server. No account required.
FAQ
Frequently asked questions
How do I clean a messy CSV file?
Open your CSV in SheetTool and use the cleaning tools to trim whitespace, remove empty rows, and deduplicate records. Then export the clean result.
Can I remove duplicate rows from a CSV?
Yes. SheetTool can detect and remove duplicate rows across your entire dataset.
Does the CSV cleaner upload my data?
No. All cleaning happens locally in your browser. Your files never leave your device.
Is the CSV cleaner free?
Yes. SheetTool is completely free with no sign-up, no limits, and no watermarks.
Ready to get started?
Open SheetTool and start working with your files right away. No sign-up needed.