Converting an Old .xls File

Published: Oct 19, 2026 | Updated: Oct 19, 2026 | About (Japanese)

Key points

Open
Re-save

Steps

Old .xls files cannot be opened in Convert Excel to CSV or JSON.
Open the file in Excel and save it as .xlsx.
Select the re-saved file in Convert Excel to CSV or JSON.

Use "Convert Excel to CSV or JSON" (free)

Tools that go well with this

Convert CSV to Excel (.xlsx): Convert a CSV to an Excel (.xlsx) file.
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