Free CSV to Excel Converter

Drop your .csv onto the upload area above, let the browser convert it, and click Download to save the .xlsx. There is no signup and no upload — the entire flow runs on your device. When you need to go the other way, you can convert an .xlsx file back to CSV in the same browser-based flow.

No. A .csv is plain text with values separated by commas — no formatting, no formulas, no sheets. An .xlsx is a Microsoft Excel workbook that supports formulas, styling, and multiple tabs. This tool turns the plain-text CSV into a real .xlsx workbook you can open in Excel, Google Sheets, Apple Numbers, or LibreOffice. Working from structured JSON instead? You can also turn JSON data into an .xlsx workbook the same way.

CSV stands for Comma-Separated Values — a plain-text format where each row is one line and each field is separated by a comma. It is the most universal way to move tabular data between programs, which is why a dependable CSV to Excel converter matters for getting it into a spreadsheet cleanly.

The fastest path is to convert CSV to Excel here and open the resulting .xlsx — columns come through as-is, no import wizard, no delimiter settings to tweak. You can also use Excel's built-in Text Import Wizard (Data → From Text/CSV), but for standard comma-separated files the conversion here usually just works.

Your .csv is parsed in your browser and never uploaded to a server — there is nothing to store, intercept, or auto-delete later. Some converter pages say the conversion "runs entirely in your browser" while still uploading your file for server-side processing; this one actually stays on your device.

The maximum file size is 100 MB — larger files are flagged before conversion starts. Because everything runs in your browser with no upload, the real-world speed depends on your device, but files at or below 100 MB convert smoothly. That cap is smaller than some upload-based tools (1 GB), but those send your file to a server — this one never does.

Yes. The converter is fully UTF-8 / Unicode-safe, so accented letters, CJK characters, and emoji carry over exactly as they appear in your CSV. If your file is one of two you need to check against each other, you can compare two Excel files side by side without the data getting mangled either.

CSV has no formulas to preserve — it stores raw values only, so the .xlsx output is data-only too. Once it is in Excel you can add formulas, formatting, and charts yourself. To spot values present in one sheet but not another, you can also match values across two columns.

Numbers are read as numbers and stay usable in calculations. Date and currency values are inferred from your CSV where possible, but CSV has no fixed type system — if a value lands as text, reformatting the cell in Excel fixes it in a couple of clicks.

This converter expects a standard comma-separated CSV. Files split by semicolons or tabs are a different dialect and may import with every value crammed into a single column. If your file uses another separator, resave it as a standard comma-separated CSV first.

The output is .xlsx, the modern Excel format introduced in 2007 (Open XML). It is the default in current Excel, supports about 1 million rows per sheet versus 65,536 in the legacy .xls, and opens cleanly in Google Sheets, Numbers, and LibreOffice. The older .xls (Excel 97-2003) is largely legacy.

Convert when you need more than raw values — formulas, formatting, multiple tabs, charts, or filtering. CSV is ideal for moving data between systems (exports, databases, APIs), while XLSX is better once you need to analyze or present it. If you simply want to check two datasets against each other, you can also reconcile two Excel sheets.