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ISBLANK

Supported, behaves as documented

Category: Information · Last tested 2026-08-06

Real, executed compatibility results for the ISBLANK function across Microsoft Excel, Google Sheets, and LibreOffice Calc — verified by actually running it. Syntax and links to each vendor’s official documentation are below.

Support matrix

EngineDocumentedLive-testedVerdict
Excel Yes Not yet n/a
Google Sheets Yes Not yet n/a
LibreOffice Calc Yes Yes (25.8.7.3, 2026-08-06) Supported, behaves as documented

LibreOffice version history

We executed the same test cases under each LibreOffice release to show exactly when ISBLANK’s support changed — not documentation claims, real results.

LibreOffice versionVerdictTested
24.2.0.3 Supported, behaves as documented 2026-07-19
24.8.7.2 Supported, behaves as documented 2026-07-19
25.2.0.3 Supported, behaves as documented 2026-07-24
25.8.7.3 Supported, behaves as documented 2026-08-06

Executed test cases

LibreOffice Calc 25.8.7.3 (tested 2026-08-06)

FormulaDescriptionResultExpectedVerdict
=ISBLANK(A1) A1 is never written to at all (no setup_cells entry) -- a genuinely empty cell True True Matched
=ISBLANK(A1) A1 contains the formula ="" which displays as nothing but is NOT considered blank -- a classic documented divergence between 'looks empty' and 'is blank'. Verified via https://support.microsoft.com/en-us/help/823838/the-result-is-false-when-you-use-the-isblank-function-in-an-excel-spre ("the result is FALSE even though the cell appears to be empty ... when the cell contains a zero-length string") False False
A1 displays as blank but holds a zero-length-string formula result, not a true blank -- ISBLANK must return FALSE		 Matched
=ISBLANK(A1) A1 explicitly contains the value 0 -- clearly not blank False False Matched

Docs & syntax

Compared against other functions