How do I merge CSV files online for free?

Upload your CSV, Excel, or Google Sheets files using our drag-and-drop interface. Our AI-powered tool automatically detects columns and suggests smart mappings. Review the preview and download your merged file - all processing happens securely in your browser with no signup required.

Can I merge CSV files with different column structures?

Yes! Our smart column mapping technology uses AI algorithms to automatically detect similar columns across different files and suggests the best matches. You can manually adjust mappings to ensure perfect data alignment before merging.

Is it safe to merge sensitive data files online?

Absolutely secure. All file processing happens locally in your browser using WebAssembly technology. Your sensitive data never leaves your device unless you choose cloud processing for very large files (>50MB), which uses enterprise-grade encryption.

What file formats can I merge together?

Our tool supports CSV (.csv), Excel (.xlsx, .xls), TSV (.tsv), and Google Sheets files. You can mix and match different formats in a single merge operation with automatic format detection and conversion.

Are there any file size limits for merging?

We allow files up to 50MB to be processed locally in your browser for maximum privacy.

Does the CSV merge tool work on mobile devices?

Yes, our tool is fully responsive and optimized for tablets and mobile devices. While desktop provides the best experience for large datasets, you can successfully merge files on any modern mobile browser.

Do I need to create an account to use the merge tool?

No account required! Start merging files immediately with full functionality. Optional account creation enables advanced features like preset saving, team collaboration, and merge history tracking.

Merge CSV Files Instantly
– Free, No Signup Needed

Merge CSV, Excel, and Google Sheets files instantly with our professional-grade online tool. Smart column mapping, enterprise security, and zero setup required.

Local Processing

No Data Stored

Enterprise Grade

Upload Data Files

Drag and drop files here, or click to select CSV, Excel, or TSV files

Select Files

Maximum 50MB per file • Local processing

Why Choose Our CSV Merge Tool?

Built for data professionals who need reliable, secure, and fast file merging capabilities

Secure & Private

All processing happens locally in your browser. Your sensitive data never leaves your device.

Lightning Fast

WebAssembly-powered processing delivers enterprise-grade performance for files of up to 50MB.

Smart Mapping

AI-powered column detection and fuzzy matching algorithms ensure accurate data alignment.

No Signup Required

Start merging immediately without creating accounts or providing personal information.

How to Merge CSV Files in 4 Simple Steps

Complete guide to combining your data files quickly and securely

Upload Your Files

Drag and drop CSV, Excel, or Google Sheets files. Support for multiple files with automatic format detection.

Map Your Columns

AI automatically detects similar columns using fuzzy matching. Review and adjust mappings as needed.

Preview Your Merge

See exactly how your data will look. Validate mappings and check for any data quality issues.

Download Results

Get your merged file instantly. Save mapping presets for future use with similar data structures.

Frequently Asked Questions

Everything you need to know about merging CSV and Excel files

Merge CSV Files Instantly– Free, No Signup Needed