ExcelErrorFinder: a free spreadsheet error checker

A free, browser-based spreadsheet audit tool.

ExcelErrorFinder is a free spreadsheet audit tool that runs in your browser. You open an Excel file, choose which sheets and checks to run, and it reports errors and data quality issues down to the individual cell. Files are analysed without being uploaded to a server. It reads .xlsx, .xls, .xlsm and .xlsb files up to 50 MB and 100,000 rows, and password-protected files cannot be opened. Each finding comes with a plain-English explanation of the cause, the impact and how to fix it.

Spreadsheet mistakes are easy to miss and costly once a file has been shared. A broken reference, a formula that changes halfway down a column, a hidden sheet or a hardcoded number sitting where a formula should be can all change a result without any visible warning. ExcelErrorFinder checks for these problems before you send or present a file, and lets you download a PDF report of what it found so the review can be repeated or handed on.

It is used by financial analysts, accountants and auditors, data teams, and operations and HR professionals. It is particularly useful when you inherit a spreadsheet you did not build, or when you want a quick quality check on a deliverable. It is a checking aid, not a substitute for professional judgement: a clean report does not prove that a model's logic or assumptions are correct.

Features

Formula error detection

It finds #REF!, #VALUE!, #DIV/0!, #NAME?, #N/A and #NULL! errors and reports them with cell-level precision, so you can go straight to each problem instead of scrolling through sheets looking for them.

Inconsistent formula analysis

ExcelErrorFinder detects formulas that differ from their neighbours within a column, and deeply nested IF statements. Inconsistent formulas are a common source of quiet errors in ranges that should all behave the same way.

Hidden content reveal

The tool shows standard hidden sheets, rows and columns, and also 'very hidden' sheets that do not appear in Excel's normal unhide menu. This is useful when reviewing a workbook that someone else built.

Data quality checks

It flags hardcoded values, broken external links, unprotected division operations and volatile functions. These are patterns that can make a spreadsheet fragile, slow or hard to trust even when no error value is displayed.

Plain-English explanations

For every issue it finds, ExcelErrorFinder explains the cause, the likely impact and the steps to fix it. That makes the results usable by people who are not spreadsheet specialists as well as by experienced analysts.

Private, browser-based checking

Files are processed in your browser and are not uploaded to a server, which suits workbooks containing sensitive figures. You can choose which sheets and checks to run, then download a PDF report of the results.

How it works

Open your workbook

Drag and drop an .xlsx, .xls, .xlsm or .xlsb file onto the tool. No account or signup is needed, and the file stays in your browser.

Choose sheets and checks

Select which sheets to review and which checks to run, so you can focus on the parts of the workbook that matter for the review you are doing.

Review the findings

Work through the results at cell level. Each issue includes an explanation of the cause and impact, plus steps to fix it.

Download a report

Save the results as a PDF report to keep a record, share with colleagues or check against later once the fixes have been made.

Who it is for

Financial analysts who need to check a model before it goes to a client or manager.

Accountants and auditors reviewing workbooks they did not build themselves.

Data teams that want a quick quality check on files passed between departments.

Operations and HR professionals who rely on spreadsheets and want to catch errors before sharing them.

Pricing

Free to use, with no signup, no usage limits and no premium tier.

Frequently asked questions

Is ExcelErrorFinder really free?

Yes. The site states that it is completely free, with no signup, no usage limits and no premium tier, and that every check, report and guide is available to everyone at no cost.

Are my spreadsheets uploaded to a server?

No. The tool processes files in your browser, so the contents of your workbook are not sent to a server. That is helpful for confidential financial data, though you should still follow your own organisation's data handling policies.

Which file types and sizes does it support?

It opens .xlsx, .xls, .xlsm and .xlsb files, up to 50 MB and 100,000 rows. Password-protected files cannot be opened, so you would need to remove the protection in Excel before running a check.

What kinds of problems does it find?

It finds error values such as #REF! and #DIV/0!, inconsistent formulas, deeply nested IF statements, hidden and very hidden content, hardcoded values, broken external links, unprotected division and volatile functions. It cannot judge whether your model's logic is right.