Private spreadsheet QA • Runs in your browser

Find the quiet errors
before the spreadsheet speaks for you.

Drop in a CSV or TSV. SheetSanity checks structure, missing values, duplicates, mixed data types, suspicious formulas, and numeric outliers—without uploading your raw rows.

✓ No account✓ No raw-row upload✓ Free instant scan✓ $9 detailed export

Choose a spreadsheet export

Your file is read locally by this page. Maximum 10 MB.

Choose CSV or TSVor drop it here Download a deliberately messy sample →

Waiting for a fileYour audit summary will appear here.

Useful before

Imports, dashboards, billing runs, and executive reporting.

Handing off a workbook

Surface hidden assumptions before the next operator inherits them.

Loading a system

Catch malformed rows and mixed types before an import rejects—or silently coerces—them.

Trusting totals

Find duplicates and outliers that can make a plausible total wrong.

SheetSanity Pro

Export the audit trail for $9 USDC.

Free scanning stays free. One on-chain payment unlocks detailed JSON exports for 30 days on this browser. Raw spreadsheet rows remain local; only the derived report summary is sent when you export.

Base MainnetUSDCOne confirmation

Pay exactly 9 USDC on Base. The receipt is verified directly from the public blockchain.

Plain answers

Does my spreadsheet leave the browser?

No. Parsing and row-level analysis happen locally. When a paid export is requested, only the derived summary—counts, types, issue descriptions, and aggregate statistics—is sent to generate the download.

Why USDC on Base?

It allows a small, dollar-denominated payment to be verified automatically without creating an account or storing card details. Always confirm the network and recipient before sending; blockchain transfers are irreversible.

Is this accounting or compliance software?

No. It is a preflight quality tool. Important financial, medical, legal, or safety decisions still require domain review and source verification.