Clean and Format Your CSV Files Instantly
Clean messy CSV files online. Fix formatting issues, remove duplicates, standardize text case, and prepare your data for analysis - all in your browser.
Working with messy CSV files? Our online CSV cleaner helps you fix common data issues like duplicate rows, inconsistent text case, missing values, and formatting problems. Clean your CSV data instantly in your browser.
Perfect for data analysts, marketers, and anyone working with spreadsheet data. Upload your CSV file and let our tool handle the cleanup automatically.
Cleaning Options
Common CSV Data Problems
CSV files often come with various issues that need cleaning:
- Duplicate rows cluttering your data
- Inconsistent text case (UPPER, lower, Mixed)
- Missing or empty values
- Extra whitespace in cells
- Inconsistent date formats
- Special characters causing problems
CSV Cleaning Example
Messy CSV:
Name,Age,City,Age John Doe,30,New York,30 jane doe,25,los angeles, John Doe,30,New York,30 ALICE SMITH,35,CHICAGO, bob wilson,28,san francisco,28
After Cleaning:
Name,Age,City John Doe,30,New York Jane Doe,25,Los Angeles Alice Smith,35,Chicago Bob Wilson,28,San Francisco
CSV Cleaner Features
Remove Duplicates
Automatically detect and remove duplicate rows from your CSV data. Keep your dataset clean and accurate.
Fix Text Case
Standardize text case across your CSV. Convert to proper case, uppercase, or lowercase as needed.
Handle Missing Values
Identify and handle missing values. Fill with defaults or remove rows with incomplete data.
Clean Formatting
Remove extra whitespace, fix date formats, and ensure consistent formatting throughout your CSV.
How to Clean CSV Files Online
- Upload your CSV file or paste your data
- Select the cleaning options you need
- Preview the cleaned results
- Download your clean CSV file
All processing happens in your browser - your data never leaves your device. Clean your CSV files quickly and securely.
Who Needs CSV Cleaning?
- Data Analysts: Prepare data for analysis and reporting
- Marketers: Clean email lists and campaign data
- Researchers: Format research data for processing
- Business Users: Clean exported spreadsheet data
Related Data Tools
Explore more free data processing tools: