Updated June 2026 · runs 100% in your browser
CSV to Excel
Convert CSV files into Excel workbooks on your device. No upload, no sign-up, no limits.
Drop CSV files here
or click to choose
🔒 Converted on your device · 0 bytes uploaded
How it works
ConvertCabin parses your CSV and writes a real .xlsx workbook entirely in your browser using a local copy of SheetJS. Nothing is uploaded.
It stays free, unlimited and private, and works offline once loaded.
About CSV to Excel
CSV is plain text; Excel's .xlsx adds a real spreadsheet structure that opens cleanly in Excel, Numbers or Google Sheets. This keeps your rows and columns intact without a round-trip through a server.
Frequently asked questions
How do I convert CSV to Excel?
Drop one or more .csv files and download a .xlsx for each. It all runs in your browser.
Will my columns be detected?
Yes — commas (and common delimiters) are parsed into spreadsheet columns automatically.
Is my file uploaded?
No. Everything is parsed and converted in your browser with JavaScript — your data is never sent to a server.
What is a CSV file?
CSV (Comma-Separated Values) is a simple text format for tabular data: each line is a row and commas separate columns. Nearly every spreadsheet and database can read and write it.
What is an XLSX file?
XLSX is the modern Microsoft Excel spreadsheet format. It stores cells, formulas, formatting, and multiple sheets in a compressed, open XML-based package.