Convert XLS to XLSX online
Turn older Excel XLS spreadsheets into modern XLSX files for editing, sharing, compatibility, and office handoff.
Best Uses for XLS to XLSX
- 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
Pro Workflow
If you modernize lots of legacy spreadsheets, Pro supports larger uploads, repeat cleanup workflows, and priority queue processing.
Why Convert XLS to XLSX?
XLS to XLSX is one of the most useful office opportunities in the current Search Console export. People are looking for direct ways to convert old Excel files into the modern XLSX format, not a general document workflow.
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 workflows with fewer compatibility issues.
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 File Converter with the selected Workflow so the File Type, Output Target, and Mode are already aligned.
What Changes After XLS to XLSX Conversion
XLS to XLSX is usually about switching between Fixed-Layout and Editable Document Formats.
For Office-style Workflows, a clean Export Path and less Manual Rework are usually more valuable than Advanced Tuning.
XLS to XLSX Workflow Fit
Conversion Mode
This page is built for a Direct Single-File Route, with Batch Conversion available for repeated jobs.
Supported On FileConvertHQ
Single-File and Batch Routes both apply when the same Conversion needs to run more than once.
Why FileConvertHQ Fits XLS to XLSX
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.
Free Vs Pro for XLS to XLSX
Free
For quick One-Off Conversions when the job is simple and only needs to run once.
Pro
For Repeat Work, Larger Files, Batch Usage, Account-Backed History, and Saved Presets.
Saved Workflow Value
Pro applies when XLS to XLSX comes up often enough to save Settings for repeated use.
Start XLS to XLSX Conversion
Open the File Converter with this Workflow selected, or use Pro for larger Repeat Workflows.
Office Workflow Next Steps
These Office Routes connect related Spreadsheet, Document, and Presentation Conversion Workflows.
Single-File Vs Batch Fit for XLS to XLSX
Use a Single-File Route for one Upload, or Batch Mode when the same Workflow applies to multiple files.
Related Links keep Format Changes grouped by Category and Workflow.
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 after conversion?
Yes. FileConvertHQ is built around automatic file deletion after processing.
Continue XLS to XLSX Workflow
Start with the File Converter, then use Pro for Saved Presets, Larger Limits, Priority Queue Processing, and Account-Backed History.