Data Cleaner
Clean, standardize, and transform your CSV data with smart operations — duplicates, whitespace, formatting, and more.
What Data Cleaner Fixes
Real-world CSV files arrive with invisible problems that break imports, corrupt reports, and waste hours of manual cleanup. Data Cleaner handles the most common offenders automatically.
- Leading and trailing whitespace in cell values
- Duplicate rows from system exports or manual merges
- Empty rows and blank columns left by deleted records
- Inconsistent text casing across name and category fields
- Mixed date and number formats within a single column
- Encoding artifacts that cause garbled characters on import
How It Works
Data Cleaner runs entirely in your browser using Web Workers — your file is never uploaded to any server. Select your CSV, choose which cleaning operations to apply, preview the changes side-by-side, then download the cleaned file. Files up to several hundred MB process comfortably in most modern browsers with no size limit enforced by SplitForge.
Common Use Cases
- Cleaning a CRM export before re-importing to Salesforce or HubSpot
- Standardizing an email list before uploading to Mailchimp or Klaviyo
- Fixing an accounting CSV before importing to QuickBooks or Xero
- Removing blank rows from a database export before bulk insert
- Normalizing date formats across columns before a data warehouse load
- Deduplicating a lead list after combining multiple source files
Related Guides
- Fix CSV whitespace errors breaking your import
- Fix empty rows breaking CSV import
- Fix Mailchimp CSV import errors
- Clean sensitive customer data securely
Frequently Asked Questions
Does my data get uploaded to your servers?
No. Data Cleaner runs entirely in your browser using Web Workers. Your file never leaves your computer — not even temporarily.
What file types does Data Cleaner support?
CSV files (.csv). Files are processed locally regardless of size.
Is there a file size limit?
No hard limit. Files up to several hundred MB process comfortably in most modern browsers.
Can I clean multiple files at once?
Currently one file at a time. For batch processing, see our CSV Splitter tool.
Does cleaning my data change the original file?
No. Data Cleaner produces a new cleaned file for download. Your original is never modified.