CSV to Excel Converter
Transform raw CSV or TSV files into fully formatted, styled Microsoft Excel (.xlsx) workbooks instantly in your browser with zero data uploads.
Drag & drop your CSV or TSV file here, or browse
Supports .csv, .tsv, and delimited .txt up to 100 MB
What is a CSV to Excel Converter?
A CSV to Excel converter is a digital utility that translates plain-text comma-separated values into native Microsoft Excel OpenXML (.xlsx) spreadsheet workbooks. It parses delimiters, identifies column header rows, casts numeric and date strings into true binary spreadsheet cell formats, and packages them into a compressed spreadsheet archive compatible with modern spreadsheet software.
How to convert CSV to Excel online
- Select or paste your file: Drag your
.csvor.tsvfile into the dropzone above, or paste raw tabular text directly into the input box. - Choose formatting options: Customize delimiter detection, rename your target sheet, or toggle bold header row formatting.
- Preview the parsed table: Review the automatically detected columns and data types in the live interactive grid.
- Download your .xlsx workbook: Click Download Excel (.xlsx) to instantly generate and save your file locally with no cloud latency.
CSV vs XLSX file comparison
| Feature | CSV (Comma Separated) | Excel XLSX (OpenXML) |
|---|---|---|
| Format Type | Flat plain text | Compressed XML zip package |
| Cell Data Types | Strings only (all raw text) | Numbers, Booleans, Dates, Formulas, Text |
| Multiple Sheets | No (single table only) | Yes (unlimited workbook sheets) |
| Styling & Colors | None | Fills, fonts, borders, bold headers |
| Compatibility | All text editors & databases | Excel, Google Sheets, Numbers, Calc |
Looking to perform the reverse operation? Use our Excel to CSV Converter to extract sheets into clean text, or clean messy files first with our CSV Cleaner & Formatter.
Frequently asked questions
Does this tool generate a real Microsoft Excel .xlsx file?
Yes. It compiles a valid, native OpenXML (.xlsx) workbook containing XML sheets, cell type metadata, and font styling. The resulting file opens without warning prompts in Microsoft Excel 2010 through 2026, Office 365, Google Sheets, Apple Numbers, and LibreOffice.
Are numbers and currency formatted properly instead of stored as text?
Yes. The converter detects numeric values, integers, decimals, and percentages, encoding them as native numeric cells in Excel. This allows you to immediately perform formulas like SUM and AVERAGE without manual cell reformatting.
Is my CSV data kept private and secure?
Absolutely. The conversion occurs entirely inside your web browser using JavaScript client-side APIs. Not a single byte of your data or filename is uploaded to any server or cloud storage.
Can I convert tab-delimited (TSV) or semicolon-delimited files?
Yes. The tool features intelligent automatic delimiter detection that supports commas, semicolons, tabs, and pipes, or you can explicitly choose your delimiter in the options toolbar.
What is the maximum file size supported?
Because conversion runs in your browser memory, it effortlessly handles files with up to 100,000 rows. For optimal performance, modern browsers like Chrome, Firefox, Safari, or Edge are recommended.