EXCEL AUDIT TOOL · PRE-SEND AUDIT
An Excel audit tool you can run on any workbook in under a minute.
SaferSheets is an Excel audit tool for anyone who has ever sent a spreadsheet and then noticed something was wrong. Upload any .xlsx file and we run eight checks in parallel — formula integrity, data quality, structural consistency, hidden risks. You get a ranked list of every issue with the exact cell and the fix.
Free tier — 30 audits/month — no card required.
Why Excel needs an audit tool
Excel was built for individual modeling, not for sharing 50-tab workbooks across teams and years. The result: every workbook accumulates silent breakage. A broken VLOOKUP that nobody noticed because the lookup column was renamed. A hardcoded number jammed into a SUM that was "just temporary" two quarters ago. A circular reference that resolved to the wrong number on first calc and quietly stayed wrong.
Manually finding these takes hours of click-by-click inspection. An automated Excel audit tool does the same job in seconds — and catches the patterns a human reviewer naturally misses.
How the audit runs
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1. Upload
Drag any .xlsx into the browser, or pick a Google Sheet from Drive. Files up to 50 MB on the free tier.
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2. Parse
SaferSheets reads every cell, formula, sheet, named range, and external link in your workbook. Nothing leaves the audit session.
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3. Run eight checks
Formula integrity, data quality, structural consistency, hardcoded values, external links, hidden risks, percent / unit drift, and an AI workbook summary.
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4. Review + export
Every finding is ranked by severity and ties back to the exact cell. Download an annotated copy with cell comments documenting each issue.
What an audit catches that a human review misses
A careful Excel user can spot the visible problems — the red #REF! cells, the obvious #DIV/0! errors. The audit tool catches the invisible problems too.
Formula breaks that don't show errors
VLOOKUP returning the wrong column index because a column was inserted. INDEX-MATCH pointing at a renamed range. Formulas referencing cells in a deleted sheet — the cell still calculates, just from stale data.
Hardcoded values inside formulas
=SUM(A1:A10) + 5000 — the 5000 was a one-off adjustment six months ago. Now it's permanently inflating the total. The hardcode detector finds every literal number buried inside a calculation.
Percent and unit drift
One column formats as %, the next as decimal. A formula multiplying them produces a number that's 100× off. The consistency scanner finds these mismatches before they reach a presentation.
External links you didn't know existed
Cells referencing other workbooks you no longer have access to. These show as #REF! when the link breaks but often resolve silently to stale values when it doesn't. Both are flagged.
Hidden sheets and hidden columns
The audit lists every hidden sheet and column with what's in them — sometimes left over from a copy, sometimes intentional but forgotten.
Inconsistent ranges across formulas
Half your column formulas sum A1:A100, the other half sum A1:A99. Both look right at a glance. The audit shows you which.
Frequently asked questions
How long does an Excel audit take?
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For files up to 5 MB, usually under 10 seconds. Files up to 50 MB take 30-60 seconds depending on formula count and sheet structure. The audit runs in our analyzer service — your browser doesn't have to do the work.
Does SaferSheets store my Excel file?
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The file is held in memory during the audit (typically 30-60 seconds) and discarded after. We store the audit results (issue list with cell references), a thumbnail, and audit metadata — never the raw file contents. Full details in our privacy policy.
Will it work on .xlsm files with macros?
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Yes — SaferSheets reads the cell and formula content of .xlsm files. We do not execute VBA macros (security boundary), so any value produced by macro code shows as its last calculated value. If your sheet is macro-heavy and needs runtime evaluation, run the macros in Excel first, then audit the resulting state.
Can I audit a workbook without sharing it with you?
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Yes. The file is uploaded over HTTPS to our analyzer, processed in memory, and the contents are discarded once the audit finishes. We retain the audit results, not the workbook. No human reads your data.
What's the difference between this and Excel's built-in error checking?
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Excel's built-in checker catches visible cell errors (#REF!, #DIV/0!, etc.). SaferSheets catches those plus the invisible ones — hardcoded numbers in formulas, inconsistent ranges, structural drift between sheets, external references you don't know exist, and percentage-format mismatches. It's the difference between a spell-checker and a copy-editor.
Further reading
Deep-dives from the SaferSheets blog
Audit playbook
How to Audit an Excel Workbook Before Sending It
Learn how to audit an Excel workbook before sending it to a client, manager, investor, or team. Check formulas, hidden sheets, links, duplicates, and data quality.
3 min read
Strategy
What Is a Spreadsheet Health Score?
Learn what a spreadsheet health score is and how it helps evaluate formula integrity, data quality, hidden risks, and workbook structure.
2 min read
Audit your next spreadsheet before you send it.
Free tier covers 30 audits a month. No card. Sign in with Google and you're running in under a minute.
Audit. Validate. Trust your data.
Related tools
- Spreadsheet error checkerCatch broken cells, bad references, and silent risks.
- Excel formula checkerFind every broken or risky formula in a workbook.
- Excel hardcode detectorSurface hardcoded numbers buried inside formulas.
- Compare Excel workbooksDiff two versions of the same file, ranked by risk.
- Inherited workbook auditAudit a spreadsheet you didn't build before relying on it.
- Google Sheets audit toolAudit any Google Sheet for the same errors as Excel.