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XLSX Hidden Sheet Detector
List workbook tabs and distinguish visible, hidden and very-hidden sheet declarations without changing the XLSX.
XLSX
JSON
Browser only
Runs locally in your browser. Your files, pasted content and generated output are not uploaded. Reset clears this tool’s working data.
This tool needs JavaScript. If it does not load, refresh the page and try again.
How to use this tool
- Choose one unencrypted standard XLSX workbook.
- Select Inspect workbook, then review the visibility counts and the ordered sheet list.
- Download hidden-sheets.json. Use your spreadsheet application if you need to change sheet visibility.
Examples
Tabs Data, Hidden data and Internal declared visible, hidden and veryHidden appear separately in the report.
Limitations
- Up to 20 MiB input, 50 worksheet or chart-sheet tabs and 64 MiB expanded package; inspected XML parts are limited to 8 MiB and 200,000 nodes. JSON output is limited to 20 MiB; processing has a 60-second deadline.
- Standard Transitional XLSX only. Encrypted, macro, digitally signed, embedded-object and external-workbook-link packages are rejected.
- This detects sheet-tab visibility only; it does not inspect hidden rows or columns, unhide sheets, remove protection or scan cell contents. Hidden state is not encryption or access control.
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