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Invoice Duplicate Checker

Find duplicate invoices in a list before you pay one of them twice.

Invoice Tools Reviews Free · no sign-up

Days apart that two identical amounts from one supplier are still suspicious.

Quick Tool Overview

The Invoice Duplicate Checker reads a list of invoices and finds the four patterns a duplicate payment makes: the same number twice, the same supplier and amount on the same date, numbers that match once punctuation is ignored, and same-amount invoices close together.

What it does
Finds duplicate invoices in a list
You give it
A CSV or pasted invoice list
You get back
Grouped matches, ranked by certainty
Best for
Accounts payable before a payment run
Invoice Tools Free, unlimited use No sign-up Runs in your browser

About the Invoice Duplicate Checker

Paying an invoice twice is one of the most common and least noticed losses in accounts payable. It happens when a supplier emails a copy, when a PDF is filed and rekeyed, when the same job is invoiced once by the branch and once by head office, or when a number is typed as INV-1042 one day and INV1042 the next.

Paste your invoice list — a CSV, a spreadsheet column, or a statement pasted from an email — and this looks for four kinds of duplicate. Exact repeats of the same invoice number from the same supplier. The same supplier, amount and date under different numbers. Numbers that match once punctuation and leading zeros are ignored. And same-amount invoices from one supplier close together in time, which is the pattern a rekeyed invoice makes.

Each group is shown with the rows it contains and why they matched, ranked so the certain duplicates come first. It reads your list in the browser — supplier names, amounts and dates never leave your machine.

Key features of the Invoice Duplicate Checker

Four match rules

Exact, same-amount, normalised number and near-date.

Ranked by certainty

Certain duplicates first, possible ones last.

Column names matched

Supplier, number, date and amount under their usual aliases.

CSV of findings

To attach to the supplier query.

Private

Supplier names and amounts never leave your machine.

How to use the Invoice Duplicate Checker

  1. 1

    Paste the invoice list

    CSV, tab-separated or a pasted statement, with a header row if you have one.

  2. 2

    Set the window

    How many days apart two same-amount invoices are still suspicious.

  3. 3

    Work through the groups

    Certain matches first, then the probable ones.

  4. 4

    Download the findings

    As CSV, to attach to the query.

Frequently asked questions

A certain duplicate is the same supplier and the same invoice number. A probable one is the same supplier, amount and date under different numbers, or numbers that are identical once punctuation is ignored. A possible one is the same supplier and amount within the window you set.

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