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When the File Is an Old .xls

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

Key points

Open
Re-save

Steps

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

Use "Convert an Excel Table to HTML or Markdown" (free)

Tools that go well with this

Convert Excel to CSV or JSON: Convert an Excel sheet to CSV, TSV or JSON.
Convert Word to HTML: Turn Word text into HTML.
Convert CSV and JSON: Convert between CSV and JSON instantly.

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