Upload your CSV file and download it as Excel (.xlsx). Clean your data during conversion: remove duplicates, validate emails, fix dates. 100% browser-based, no upload to servers.
Drop your CSV file or click to browse. Files stay in your browser, never uploaded to servers.
See your data in a clean table. Check column headers, data types, and row count.
Select cleaning tools: duplicates, emails, dates, numbers, whitespace, and 9 more.
Click "Download Excel" to get your clean .xlsx file instantly. No server processing.
Files never leave your browser. No server upload, no cloud storage.
Remove duplicates, validate emails, fix dates – all in one step.
Convert 10,000+ rows in under 1 second. No waiting, no spinning wheels.
Works in any browser. No Microsoft Excel license needed.
Export clean data from databases, CRMs, or APIs as CSV, then convert to Excel for dashboards and pivot tables. Remove duplicates and fix date formats during conversion to save hours of manual cleaning.
Example: Export 50,000 sales records from Salesforce as CSV → Remove duplicates → Normalize dates to YYYY-MM-DD → Download as Excel for quarterly report.
Convert product catalogs, customer lists, and order exports from CSV to Excel. Clean email addresses, remove duplicates, and standardize phone numbers – all before importing to email marketing tools.
Example: Export 10,000 customer emails from Shopify → Validate emails → Remove duplicates → Fix "gmial.com" → Download Excel for Mailchimp import.
Convert bank statements, transaction logs, and expense reports from CSV to Excel. Clean currency symbols, normalize number formats, and remove empty rows in one step.
Example: Export bank transactions as CSV → Remove "$" symbols → Convert "1,234.56" to numbers → Remove empty rows → Download Excel for budget analysis.
Find and remove duplicate rows based on any column combination. Keep first or last occurrence.
Validate email syntax, fix common typos (gmial→gmail), flag disposable addresses.
Convert dates from 30+ formats to ISO 8601 (YYYY-MM-DD). Handle US/UK formats.
Trim leading/trailing spaces, remove double spaces, clean tabs and line breaks.
Remove currency symbols ($, €, £), normalize decimals, clean thousand separators.
Text case, split/merge columns, country codes, find & replace, filters, empty rows, and more.
Upload your CSV file to neatcsv, optionally clean the data, and click "Download Excel". The conversion happens in your browser and is 100% free for files up to 10,000 rows (Starter plan, 9€/month). No installation required.
No. All CSV to Excel conversion happens in your browser using JavaScript. Your file never leaves your computer. This ensures maximum privacy and GDPR compliance.
Yes! neatcsv offers 14 cleaning tools: remove duplicates, validate emails, fix dates, clean numbers, trim whitespace, and more. Select the tools you need, preview the changes, then download as Excel.
We create modern .xlsx files (Excel 2007+), which are smaller, faster, and support more rows (1 million+) compared to legacy .xls files (65,536 rows max).
File size depends on your plan: Starter (10k rows), Professional (100k rows), Business (500k rows). Processing happens in-browser, so very large files may require a modern browser with sufficient memory.
No. You can convert CSV to Excel without having Excel installed. The tool works in any modern browser. To open the .xlsx file later, you can use Excel, Google Sheets, LibreOffice Calc, or any spreadsheet app.
Currently, neatcsv processes one file at a time to ensure data quality and allow you to preview changes. For batch processing, consider using our API (available on Business plan).
neatcsv handles UTF-8 encoding correctly, preserving special characters (é, ñ, ü, 中文, etc.). The output Excel file maintains full Unicode support.
Join thousands of users who trust neatcsv for data cleaning and conversion.
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