Paste or type a list of invoices and instantly find duplicates before they turn into duplicate payments. No sign-up, no upload — the check runs entirely on your device.
| Vendor | Invoice # | Date | Amount | |
|---|---|---|---|---|
Duplicate invoices are one of the most common — and most expensive — errors in accounts payable. The same bill gets entered twice with a slightly different invoice number, a re-sent PDF is keyed in again, or a vendor submits the same charge across two periods. This free checker catches those cases using the same matching logic that powers the DupeInvoice app:
The same invoice number and vendor appear more than once — after normalizing case, spacing, and punctuation (so INV-001 and inv 001 match).
The amount, date, and vendor all match even though the invoice number differs or is missing — the classic signature of a duplicate payment.
The same vendor billed the same amount, which is worth a second look even when other fields don't line up.
Each duplicate group gets a confidence score that combines every matching signal, so the strongest matches rise to the top of your results.
DupeInvoice reads your PDF and scanned invoices with OCR, checks thousands automatically, keeps a saved audit trail, and exposes an API — so duplicates get caught before payment, not after. Free for your first 50 invoices a month.
Start free — no credit cardor see pricing