Convert XLS to XLSX online
Turn older Excel XLS spreadsheets into modern XLSX files for editing, sharing, compatibility, and office handoff.
Use XLS to XLSX For
- Converting older Excel spreadsheets into modern XLSX files
- Preparing legacy spreadsheet archives for office reuse
- Normalizing XLS files for collaboration and review
- Converting repeat legacy spreadsheet jobs into XLSX
How XLS to XLSX Conversion Works
- Upload your XLS spreadsheet.
- Choose XLSX as the output format.
- Convert and download the finished XLSX file.
This page opens the converter with the matching source, target, and mode selected.
Why Convert XLS to XLSX?
XLS to XLSX is useful when older Excel files need to move into the modern XLSX format without opening a general document converter.
This page is built for that legacy-spreadsheet cleanup workflow: upload an XLS file, convert it to XLSX, and use the output in modern office work with fewer compatibility issues.
What Changes After XLS to XLSX Conversion
XLS to XLSX usually moves a file between fixed-layout, editable, spreadsheet, presentation, or ebook formats.
For office files, a clean export path and fewer repeated steps matter more than extra controls.
Why FileConvertHQ Fits XLS to XLSX
Direct format pages keep the conversion path short while still supporting saved presets, account history, and Pro limits when needed.
More current compatibility
XLSX is usually ready for editing, review, and share in modern spreadsheet workflows than older XLS files.
Useful for spreadsheet cleanup
XLS to XLSX is practical when older spreadsheet archives need to be modernized.
Good repeat workflow
Teams with legacy spreadsheet libraries can use this as a simple normalization route.
Plan Fit for XLS to XLSX
Free
For quick one-off conversions with standard limits.
Pro
For larger files, batch use, saved presets, account history, and priority queue processing.
Open XLS to XLSX
If you modernize lots of legacy spreadsheets, Pro supports larger uploads, repeat cleanup workflows, and priority queue access.
Related Office Conversions
Related spreadsheet, document, presentation, and ebook routes.
XLS to XLSX FAQ
Why convert XLS to XLSX?
XLSX is often ready to use in current spreadsheet workflows than older XLS files.
Is this useful for legacy spreadsheet cleanup?
Yes. XLS to XLSX is practical when older spreadsheets need to be modernized for editing and sharing.
Can I batch convert XLS files?
Yes. Batch document workflows can support larger spreadsheet cleanup jobs.
Are uploaded files deleted?
Yes. FileConvertHQ automatically deletes processed files after the retention window.
Continue With XLS to XLSX
Open the converter with this format pair selected. Use Pro when you need larger limits, saved presets, and account-backed history.