How do I use the CSV Merger?

Enter or paste your input value, select the source and target formats, then click Convert. The result appears instantly. All conversions run locally in your browser — no data is sent to any server.

Is there a file size limit for the CSV Merger?

Since all conversions happen locally in your browser, the limit depends on your device's memory. Most typical inputs are processed instantly. Very large files may take longer but will still work without server upload.

CSV Merger - Free ToolBase

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Upload multiple CSV files and merge them. Supports row append, dedup, and sorting. Data stays in browser.

No dependencies · Client-side only

Upload CSV Files

📁

Drag CSV files here, or click to browse

Skip header rows of subsequent files Remove duplicate rows Sort by first column

FAQ

What CSV formats are supported?

Supports standard comma-separated CSV files with automatic quote handling. Other delimiters (semicolon, tab) are auto-detected.

How does merging work?

Row append: data rows from each CSV are concatenated. If "Skip header" is checked, only the first file's header row is kept.

Is my data safe?

Completely safe. Everything runs locally: CSV Merger and other values are processed on your device, never sent to a server. Files are never uploaded to any server.

📊 CSV Merger

Upload CSV Files

FAQ

What CSV formats are supported?

How does merging work?

Is my data safe?

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