How to convert CSV to XLSX
1. Upload CSV
Select or drag and drop your CSV file into the converter.
2. Choose XLSX
Select XLSX as your output format. You can process multiple files at once.
3. Download
Click convert and download your new XLSX file instantly.
Format Details
CSV
CSV (Comma-Separated Values) is a plain-text tabular data format that uses commas to delimit column values and line breaks to separate rows. It is one of the most universally supported data interchange formats, readable by any spreadsheet application, database, or programming language. CSV is ideal for exporting and importing data between different systems due to its simplicity, human readability, and near-universal compatibility.
XLSX
XLSX is the default spreadsheet format for Microsoft Excel since Office 2007, built on the Open XML standard and standardized by ISO. It stores worksheets, formulas, charts, pivot tables, and formatting in a compressed ZIP archive of XML files, making it more compact and corruption-resistant than the older XLS format. XLSX is supported by Google Sheets, LibreOffice Calc, Apple Numbers, and virtually every modern data tool.
Frequently Asked Questions
How do I convert CSV to XLSX?
Upload your CSV file on Convertek, select XLSX as the output format, then click Convert. Your XLSX file will be ready to download instantly.
Is the CSV to XLSX converter free?
Yes. Converting CSV to XLSX on Convertek is completely free with no watermarks. Fair upload limits apply (typically 30 MB per file).
Is my file kept after conversion?
No. Files are processed temporarily and not stored permanently. Converted downloads are available only in your browser session.
What is the difference between CSV and XLSX?
CSV and XLSX are different file formats with distinct use cases. Converting between them lets you use your file in software or workflows that require the XLSX format.