Clean your CSV files instantly. Remove duplicates, trim whitespace, delete empty rows. All processing happens in your browser - your data never leaves your computer.
Click to upload or drag and drop a CSV file
Max 10MB for free version
Upgrade to CSV Sweeper Pro for enterprise-grade features
Yes! This free online CSV cleaner is 100% free with no sign-up required. It runs entirely in your browser using JavaScript, so your data is never uploaded to any server.
The free version includes: duplicate row removal, whitespace trimming, empty row removal, empty column removal, newline removal in cells, and header row detection. All processing is done locally.
CSV Sweeper Pro adds CSV formula injection scanning (security), dual-stage encoding detection for files with unusual character sets, undo history for safe cleaning, support for 500K+ rows with disk-based processing, and Excel/Parquet export. Get Pro here.
CSV injection is a security vulnerability where malicious formulas (=, +, -, @) embedded in CSV data can execute commands when opened in Excel or Google Sheets. The free version doesn't scan for this - upgrade to Pro for full injection protection.
Absolutely. This tool processes everything in your browser using JavaScript. Your CSV data is never uploaded, stored, or transmitted to any server. It stays on your computer.
The free version supports files up to 10MB (approximately 100,000 rows depending on column count). For larger files, CSV Sweeper Pro supports 500K+ rows with disk-based snapshot compression.
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