Home / Merge CSV & Spreadsheet Tables
Merge CSV & Spreadsheet Tables
Combine XLSX, CSV, or TSV tables with matching headers directly in your browser.
Drop files here or choose files from your device
Processing happens directly on your device. No file bytes are uploaded, and this tool uses no Cloudflare Container compute.
How to use Merge CSV & Spreadsheet Tables in 3 steps
- Choose your file: Supports .xlsx, .csv, .tsv; Maximum 15 MiB; XLSX 2 MiB
- Review the preview or confirm processing: Processing happens directly on your device. No file bytes are uploaded, and this tool uses no Cloudflare Container compute.
- Get the result immediately: Download the processed file and open it in Microsoft Excel or Google Sheets
Why does this problem happen, and how does this tool fix it?
Copying daily or branch reports by hand can shift columns, duplicate header rows, or silently omit a file. A deterministic merge keeps the first header and appends the remaining data rows.
How it works and protects your data: The tool combines up to five XLSX, CSV, or TSV files in the browser, reads only the first visible XLSX worksheet, removes repeated headers, and exports CSV/TSV or data-only XLSX.
Frequently asked questions
Will each source file add another header row?
No. The first file provides the header; later header rows are removed before their data is appended.
What is the maximum merge size?
You can combine up to five files: 15 MiB total for CSV/TSV, or 2 MiB total when XLSX is included. Each XLSX is limited to 2 MiB.