Client-side file inspector

Audit, Analyze, and Inspect Your Excel Workbooks Instantly—Securely in Your Browser

ExcelAnalyzer audits, analyzes, and inspects an Excel workbook in your browser. It reads .xlsx and .xlsm locally, with a partial reading for .xlsb, and shows clear stats plus advice that can improve performance. It does not edit, convert, repair, or upload the file. Legacy .xls is refused.

Verify that the file never leaves

Local check

Drop an Excel workbook here or choose a file. .xlsx and .xlsm are fully checked. .xlsb is partial. .xls is refused with instructions. Maximum 250 MB. The workbook is read in this browser and is not uploaded.

What one drop checks

Size and bloat

Find the parts, ranges, caches, and rules that make a workbook heavy.

Speed and formulas

See volatile functions, cached errors, names, and formatting that slow calculation.

Risk and exposure

Inventory macros, hidden sheets, and links to other files before you trust a workbook.

Package integrity

Check whether the ZIP package and its XML parts are complete and well formed.

The audit score starts at 100 and subtracts capped deductions for file efficiency, calculation speed, structural integrity, and security hygiene. Every deduction names its reason. The score is a reading of the package, not a promise that a workbook is safe to open.

Choose a focused check

See which parts make a workbook heavy

See which sheets, images, pivot caches, and styles make a workbook large.

Check a sheet that remembers empty rows

Compare each sheet’s declared used range with the last cell that holds a value.

Measure cached pivot records

Measure pivot cache records, saveData, and refreshOnLoad without opening Excel.

Count fragmented formatting rules

Count conditional formatting rules and fragmented ranges that bloat styles.

Find formulas that recalculate too often

Count NOW, TODAY, RAND, OFFSET, INDIRECT, and whole-column refs.

Locate cached #REF! and #VALUE! cells

List cached #REF!, #VALUE!, and #N/A cells with sheet addresses.

List links to other workbooks

List workbook links and the formulas that still use them.

Audit hidden and broken names

Review hidden, broken, external, and unused defined names.

Inventory macros without opening Excel

See whether a workbook contains VBA, which modules it lists, and auto-start names.

Find sheets the Unhide box will not show

List visible, hidden, and very hidden sheets from the workbook part.

Check a workbook Excel calls unreadable

Test ZIP integrity, missing parts, and XML well-formedness.

Start from the question you have

Formats

.xlsx and .xlsm are read fully: size, used range, pivots, formatting, formulas, names, links, sheets, macros, and package integrity. .xlsb reports size, sheet names, visibility, and whether a VBA project is present. .xls from Excel 97–2003 is not a ZIP package, so it is turned away instead of being misread as corruption.