All Questions
View all FAQs
Getting Started
Basic usage and setup
Technical Issues
Troubleshooting and errors
Features
Tool capabilities and limits
Security & Privacy
Data protection and safety
Getting Started
What is Merge CSV and how does it work?
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Merge CSV is a free, web-based tool that allows you to combine multiple CSV (Comma-Separated Values) files into a single file. It works entirely in your browser using JavaScript, which means:
- No files are uploaded to our servers
- All processing happens on your device
- Your data remains completely private
- Works offline once the page is loaded
💡 Tip: The tool automatically handles header matching and maintains data integrity during the merge process.
How do I merge my CSV files?
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Follow these simple steps:
- Step 1: Click the upload area or drag and drop your CSV files
- Step 2: Select multiple CSV files from your computer (minimum 2 files)
- Step 3: Click the "Merge Files" button
- Step 4: Preview the merged result
- Step 5: Download the combined file or copy to clipboard
💡 Pro tip: For best results, ensure all your CSV files have the same column structure and headers.
What file formats are supported?
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Currently, our tool supports:
- CSV files (.csv) - Primary format
- Text files (.txt) - If they contain comma-separated data
- Various encodings: UTF-8, ASCII, and most common text encodings
⚠️ Note: Excel files (.xlsx, .xls) are not directly supported. Please save them as CSV format first.
Technical Issues
Why is my file not uploading or processing?
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Common issues and solutions:
- File size too large: Maximum file size is 10MB per file
- Wrong format: Ensure files have .csv extension and contain CSV data
- Browser compatibility: Use modern browsers (Chrome, Firefox, Safari, Edge)
- JavaScript disabled: Enable JavaScript in your browser settings
- Corrupted file: Try opening the file in a text editor to verify it's valid
💡 Quick fix: Try refreshing the page and uploading again if you encounter any errors.
The merged data looks incorrect. What went wrong?
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Several factors can affect merge quality:
- Mismatched headers: Files have different column names or order
- Different delimiters: Some files use semicolons instead of commas
- Special characters: Files contain quotes, commas, or newlines in data
- Encoding issues: Different character encodings between files
💡 Solution: Standardize your CSV files before merging by ensuring consistent headers and formatting.
Browser compatibility and requirements
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Our tool works best with:
- Chrome: Version 70+ (recommended)
- Firefox: Version 65+
- Safari: Version 12+
- Edge: Version 79+
Requirements:
- JavaScript enabled
- Modern browser with File API support
- Sufficient RAM for processing large files
Features & Limitations
What are the file size and quantity limits?
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Current limitations:
- File size: Maximum 10MB per individual file
- Number of files: No strict limit, but performance may vary
- Total rows: Limited by your browser's memory (typically 100K+ rows)
- Processing time: Depends on file size and device performance
💡 Performance tip: For very large datasets, consider splitting them into smaller batches.
Can I merge files with different column structures?
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Yes, but with considerations:
- Extra columns: Missing columns will be filled with empty values
- Different order: Columns will be aligned by name, not position
- Missing headers: Files without headers may cause issues
- Data types: All data is treated as text during merge
⚠️ Best practice: Ensure all files have consistent column headers for optimal results.
What output formats are available?
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Output options:
- CSV download: Standard comma-separated values file
- Copy to clipboard: For pasting into other applications
- Preview: View merged data before downloading
The output maintains:
- Original data formatting
- Column headers
- UTF-8 encoding
- Proper CSV escaping for special characters
Security & Privacy
Is my data safe? Do you store my files?
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Your data is completely safe:
- No upload: Files are processed entirely in your browser
- No storage: We never save or store your files on our servers
- No transmission: Your data never leaves your device
- Local processing: All merging happens using client-side JavaScript
🔒 Privacy guarantee: Your files are as secure as using a local desktop application.
Can I use this tool for sensitive or confidential data?
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Yes, the tool is designed with privacy in mind:
- Client-side only: No data transmission to external servers
- No logging: We don't log file contents or names
- HTTPS secure: Website uses encrypted connections
- Memory clearing: Data is cleared when you close the browser
💼 Business use: Many organizations use our tool for confidential data processing.
What analytics or tracking do you use?
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We use minimal analytics:
- Google Analytics: Basic website usage statistics (anonymized)
- No file tracking: We don't track what files you process
- No personal data: We don't collect names, emails, or personal info
- Cookies: Only essential and analytics cookies
You can disable tracking by:
- Using browser privacy extensions
- Disabling JavaScript (though this breaks the tool)
- Using incognito/private browsing mode
📧 Still Have Questions?
Can't find the answer you're looking for? We're here to help!
Contact us at: support@mergecsv.com
Or visit our Contact Page for more options.