Convert Excel Spreadsheet (Legacy) files to Excel Spreadsheet format instantly. Free, fast, and private — no signup required.
Supports XLS and more
Files are processed locally in your browser. Nothing is uploaded to a server.
The XLS to XLSX converter transforms Excel Spreadsheet (Legacy) files into Excel Spreadsheet format. Upload your .xls file and get a .xlsx file instantly — no software to install, no account to create.
XLS: Legacy Excel format. XLSX: Modern Excel spreadsheet format. Converting from XLS to XLSX is useful when you need the specific advantages of the XLSX format — whether that's compatibility, file size, quality, or feature support.
The converter processes your XLS document and transforms it into XLSX format. Text content, basic formatting, and structure are preserved during conversion. Complex layouts may need minor adjustment in the output file.
Getting Started
Drag and drop your file into the converter, or click to browse. Supports XLS and more.
Configure output settings like quality, size, and format options. Defaults work well for most use cases.
Click "Convert" and your XLSX file is ready in seconds. Free, unlimited, no account required.
Sharing documents across different software platforms. Preparing files for submission, printing, or archiving. Converting between Microsoft, Apple, and open-source format ecosystems.
FAQ
Upload your .xls file to the converter, and it produces a .xlsx file automatically. Click Download to save the result. The entire process runs in your browser — nothing is uploaded to a server.
Yes. Completely free with no signup, no watermarks, and no file limits. You can convert as many files as you need.
Basic text formatting, paragraphs, and structure are preserved. Complex layouts, custom fonts, and advanced formatting may need minor adjustment after conversion.
Yes. Upload multiple .xls files and they all convert to .xlsx format. Download them individually or as a batch.
All Converters