Upload CSV, Excel or JSON – clean with 14+ tools – export in your preferred format. 100% private processing. Pay only for the rows you clean.
From duplicates to date formats – clean any CSV, Excel or JSON file with our comprehensive toolset.
Find and remove duplicate rows based on any column. Case-insensitive options.
Validate email syntax, fix common typos (gmial→gmail), flag invalid domains.
Convert dates to ISO 8601 (YYYY-MM-DD) from 30+ formats. Auto-detect US/EU dates.
Remove 35+ currency symbols, convert formats (US/EU/Swiss), round decimals.
Trim leading/trailing spaces, remove tabs, normalize line breaks, collapse multiple spaces.
Convert to uppercase, lowercase, title case, or sentence case. Smart capitalization.
Split "First Last" into separate columns by space, comma, or custom delimiter.
Combine multiple columns into one with custom separators (space, comma, dash).
Convert country names to ISO codes (US, DE, GB) and vice versa. 195 countries supported.
Search and replace text across all columns. Supports regex patterns.
Keep or remove rows based on column values. Supports multiple conditions.
Delete rows with all empty cells or rows missing critical data.
Normalize column names: lowercase, remove spaces, convert to snake_case.
Drag and drop to reorder columns. Delete unwanted columns.
Compare neatcsv with traditional tools.
| neatcsv | Excel | Google Sheets | |
|---|---|---|---|
| Remove duplicates | Manual | Manual | |
| Email validation | |||
| Date normalization | Complex formulas | Complex formulas | |
| Privacy (no upload) | |||
| Speed (10k rows) | < 1 sec | Slow | Very slow |
| Price | from 9€/mo | $70/yr | Free (limited) |
Pay only for the rows you clean. Limits reset monthly. Upgrade or downgrade anytime.
Perfect for small projects
For growing teams
For high-volume users
All plans include 100% private processing. Your data never leaves your browser.
Upload your data in any common format. After cleaning, download it exactly how you need it.
No formulas. No scripts. No Python. Upload, click, and download clean data.
Case-insensitive matching across one or multiple columns.
A@B.com = a@b.com
Trim, reduce, remove BOM, zero-width and invisible characters.
" John Doe " → "John Doe"
Delete rows that are completely empty or have blank key fields.
,,, → removed
Multi-condition filters with AND/OR logic, regex, and numeric comparisons.
age > 18 AND status = active
Format check, domain typo fix (gmial→gmail), disposable email detection. Adds is_valid_email column.
user@gmial.com → user@gmail.com
Remove currency symbols (35+ codes), normalize thousand separators (1'234 / 1.234 / 1,234), handle accounting negatives (500) and rounding.
CHF 1'234.56 → 1234.56
Auto-detect 10+ formats including 2-digit years, text months (EN/DE), and ordinal suffixes.
5. Jan 2024 → 2024-01-05
UPPER, lower, Title Case or Sentence case with smart handling of hyphens and apostrophes.
JANE SMITH → Jane Smith
Standardize country names to ISO codes (Germany → DE, United Kingdom → GB).
Germany → DE
Split one column into multiple by any separator (space, comma, pipe, etc.).
"John Doe" → "John" + "Doe"
Combine multiple columns into one with a custom separator.
"John" + "Doe" → "John Doe"
Search and replace text across all or selected columns, with regex support.
"N/A" → ""
Convert headers to snake_case or camelCase, remove special characters and deduplicate.
"First Name" → first_name
Drag-and-drop column reordering. Remove columns you don't need.
A, B, C → C, A (B removed)
See what our users say about cleaning their data with neatcsv.
"Saved me hours of manual work! The email validation caught 300+ typos in our Mailchimp list. Worth every cent."
"Finally, a tool that handles mixed date formats! Converted 50k rows from 5 different formats to ISO dates in seconds."
"Privacy-first data cleaning! Love that my Shopify exports never leave my browser. GDPR compliant and fast."
All processing happens 100% client-side using JavaScript. We can't see your data – even if we wanted to.
Files stay on your device. Processing happens in-browser using PapaParse & SheetJS.
No cookies, no tracking, no analytics. Privacy by design. Safe for sensitive data.
Built with trusted libraries (PapaParse, SheetJS). No proprietary black boxes.
Upload your Mailchimp or HubSpot export. Remove duplicates, validate emails, fix typos, flag disposable addresses – and download a clean list ready to import.
Clean messy product exports from Shopify, WooCommerce, or Amazon. Normalize prices across currencies, fix date formats, and standardize country codes.
Load a JSON API dump or database export, clean it up, normalize headers to snake_case, reorder columns, and export as the format your system needs.
Handle accounting-style negatives (500), Swiss apostrophes (1'234), mixed EU/US decimal formats, and rounding – all automatically detected.
Drag and drop or browse. CSV, Excel (.xlsx/.xls) and JSON up to 20 MB.
Pick from 14 cleaning tools or use Quick Presets. Auto-recommendations highlight issues found.
Preview changes side-by-side. Export as CSV, Excel or JSON – or copy to clipboard.
Upload CSV, Excel or JSON. 14 powerful cleaning tools. Choose your plan and start now.
Expert guides on CSV cleaning, data transformation, and file conversion
Learn how to fix inconsistent columns, encoding issues, mixed date formats, and 7 more common CSV problems.
Complete decision matrix to choose the right data format for your project with pros, cons, and use cases.