XLS to XLSX helps you solve a specific file task: upgrade old Excel 97–2003 workbooks to the modern XLSX format. To try it, open the MediaExtractr XLS to XLSX tool and start with a copy of your original file.
When to use XLS to XLSX
Tabular files have hidden pitfalls: date interpretation, leading zeros, formulas, separators, and blank cells. Treat data correctness as more important than appearance. The relevant tool is designed to do the following: Upgrade old Excel 97–2003 workbooks to the modern XLSX format.
How to use XLS to XLSX: step by step
- Open the XLS to XLSX tool at https://www.mediaextractr.com/tools/xls-to-xlsx. Confirm that your source file type matches the tool description.
- Prepare a copy of the original and choose the relevant input file or text. For multi-file operations, check order and naming before continuing.
- Apply the available options for xls to xlsx. Use settings that match the final destination rather than choosing the smallest or highest setting automatically.
- Run the operation and save the result. If the tool reports an unsupported file, verify the input type before trying another format.
- Open the output independently and verify its content, file extension, and any important structural details.
Try a small test before processing your full file
Create a five-row test sheet with dates, negative numbers, a blank cell, and an identifier such as 00123. Apply xls to xlsx, then check the values in the exported file.
Mistakes and limitations to watch for
- Preserve leading zeros for IDs and postal codes.
- Check decimal separators and local date formats.
- Inspect formulas and blank values after conversion.
- Preserve source types and test tricky values such as dates, numbers with leading zeros, nulls, and quotation marks.
How to verify the output
What this tool does: Upgrade old Excel 97–2003 workbooks to the modern XLSX format. The steps above are a general workflow based on the supplied tool catalogue; available controls may vary with the file or browser. Compare the exported result with the original, keeping in mind that success depends on the source file and the options used. If the result is unsuitable, return to your original and adjust one setting at a time.
Frequently asked questions
What does xls to xlsx do?
Upgrade old Excel 97–2003 workbooks to the modern XLSX format.
How can I check the result after using xls to xlsx?
Open the exported file in another viewer or application and verify its content, extension, and the details most important to your workflow. Preserve source types and test tricky values such as dates, numbers with leading zeros, nulls, and quotation marks.
Do I need to keep my original file when using xls to xlsx?
Yes. Work from a duplicate until you have tested the export and confirmed it meets your requirements.
Try the tools
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Open XLS to XLSX