FileTranslator › XLS to XLSX
Convert XLS to XLSX
The binary XLS format is over twenty years old, and modern tools increasingly refuse it — while old archives, accounting exports and legacy systems keep producing it.
Drop XLS files here
or
Output is pre-set to XLSX — you can change it per file after adding.
About XLS to XLSX conversion
Your XLS is read and rewritten as a modern XLSX workbook that opens cleanly in current Excel, Google Sheets, LibreOffice and every import pipeline.
How to convert XLS to XLSX
- Drop your XLS files onto the box above, or click Choose files.
- The output format is already set to XLSX — adjust it per file if you need something else.
- Click Convert, then download your XLSX files (or everything as one ZIP).
Free, no account, no watermarks — and because the conversion runs in your browser, your files are never uploaded to a server.
XLS to XLSX — frequently asked questions
How do I convert XLS to XLSX?
Drop your XLS file onto the converter above (or click Choose files), make sure the output format is set to XLSX — it is preselected on this page — then click Convert and download the result.
Is this XLS to XLSX converter free?
Yes. Converting XLS to XLSX on FileTranslator is completely free, with no account, no file limit and no watermarks. The site is supported by ads instead of fees.
Are my XLS files uploaded to a server?
No. The conversion from XLS to XLSX runs entirely in your browser using WebAssembly and JavaScript — your files never leave your device, which makes it safe for private documents and photos.