Local Invoice Auditor & Math Checker
Audit vendor PDF invoices for math mistakes client-side. Programmatically verify item multiplication, subtotal summation, and VAT rates, fix errors in real-time, and download corrected sheets to Excel.
Invoice Audit Passed
All row multiplications, column sum equations, and VAT rate configurations match perfectly.
| Description | Stated Qty | Unit Price ($) | Stated Total ($) | Expected ($) | Audit | Action |
|---|---|---|---|---|---|---|
| $1,500 | ✓ | |||||
| $900 | ✓ | |||||
| $99 | ✓ |
Three Audit Rules Checklist
Discrepancy Variance Graph
How to Audit Vendor Invoices for Mathematical Discrepancies
Accounts payable departments and small business owners deal with hundreds of vendor invoices monthly. Studies show that between 1% to 3% of all supplier invoices contain manual input errors, incorrect rounding conventions, or obsolete item lines carried over from standard templates. Over time, these minor variances can lead to thousands of dollars in overcharges.
Upload PDF
Drag and drop your PDF invoices to parse and extract numerical text segments locally in your browser sandbox.
Audit Calculations
Perform row-level, subtotal, and tax rate calculations programmatically to pinpoint math mismatches.
Fix and Export
Manually edit incorrect cells, trigger instant total updates, and download your audited ledger to Excel.
Secure Local Auditing Features
Our auditor provides complete compliance and mathematical auditing without exposing your financial records:
100% Client-Side Privacy
Your invoices are parsed entirely inside your browser cache. No data, numbers, or document layers are uploaded or sent to external servers.
Interactive Spreadsheet Grid
Directly click and override cell values in the results table to clean up scan discrepancies or manual layout formatting errors.
Equation Verification
Automatically verifies the underlying equations: Quantity × Price = Line Total, and Subtotal + Tax = Grand Total.
Structured Ledger Output
Downloads audited ledger tables directly as a standard spreadsheet file for accounting software import or physical filing.
Frequently Asked Questions About Invoice Auditing
Frequently Asked Questions
Does this detect invoice math errors?
Yes. Verify row totals, column sums, subtotal + VAT = grand total reconciliation locally.
How does the Invoice Auditor verify my documents?
The tool uses client-side PDF text extraction libraries to locate text layers. It identifies numerical rows representing quantities, unit prices, line totals, subtotals, taxes, and final totals. It then recalculates these values programmatically using accounting formulas to check for mathematical discrepancies.
Is my financial invoice data uploaded to a server?
No. The Invoice Auditor runs entirely locally in your web browser. No data, files, or extracted numbers are ever sent to any external server. Your sensitive financial information remains completely private and secure.
How does the tool detect supplier errors?
The auditor performs three primary checks locally: 1) multiplies quantity by unit price and verifies line total, 2) sums the line totals to verify the stated subtotal, 3) reconciles subtotal with tax rate and discount to match the grand total.