How to convert CSV to XLS
1. Upload CSV
Select or drag and drop your CSV file into the converter.
2. Choose XLS
Select XLS as your output format. You can process multiple files at once.
3. Download
Click convert and download your new XLS 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.
XLS
XLS is the legacy binary spreadsheet format used by Microsoft Excel from 1987 through the Office 2003 era, based on Microsoft's proprietary Binary Interchange File Format (BIFF). It stores worksheets, formulas, charts, and macros in a binary structure that requires Microsoft's format specification to parse correctly. XLS remains common in older enterprise systems and when compatibility with legacy versions of Excel is required.
Frequently Asked Questions
How do I convert CSV to XLS?
Upload your CSV file on Convertek, select XLS as the output format, then click Convert. Your XLS file will be ready to download instantly.
Is the CSV to XLS converter free?
Yes. Converting CSV to XLS 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 XLS?
CSV and XLS are different file formats with distinct use cases. Converting between them lets you use your file in software or workflows that require the XLS format.