Drag-and-drop a messy CSV or JSON file. Instantly dedupe, fix formatting, normalize dates, and export clean data. No sign-up required.
Drop CSV, TSV, or JSON files directly. No upload to any server — everything stays in your browser.
Automatically finds blank rows, duplicates, inconsistent formatting, mixed date formats, and extra whitespace.
Remove blank rows, dedupe, trim whitespace, normalize casing, fix dates — all with a single click.
See a summary of issues found, rows affected, and before/after comparison before you export.
Split columns, merge columns, rename headers, reorder, change data types, fill blank values.
Download as CSV, TSV, or JSON. Your cleaned data, ready for Excel, databases, or visualization tools.
Drag a messy CSV, TSV, or JSON file onto the upload area. Or paste data directly.
See all issues detected. Click to fix them one-by-one or all at once. Preview changes before applying.
Download your cleaned file as CSV, TSV, or JSON. Ready for analysis.
DataClean runs entirely in your browser. No data is ever sent to any server. Your files never leave your machine.
Built by Sidequest Labs — the team behind VizFlow.