Scan the complete period
Use one copied CSV covering the same period you plan to import.
QUICKBOOKS DUPLICATE CHECKER
Find duplicate transactions before they reach QuickBooks.
Scan exact date + description + amount matches and see the affected source-row numbers while the file stays in your browser.
Check a CSV freeTHE SHORT ANSWER
An exact match is a useful warning, not automatic proof of a duplicate. Two legitimate transactions can share the same date, description and amount, so every flagged source row must be compared with the original statement.
FREE · LOCAL · FIRST 250 TRANSACTIONS
See the affected rows now.
The file is parsed in this browser tab. No CSV content is uploaded to CSV Preflight.
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Your diagnostic appears here.
Use the example or a redacted copy. Nothing is sent to a server.
SAFE WORKFLOW
Three checks before import.
Inspect every match
Compare each flagged row with the bank statement or payment-processor export.
Remove only confirmed copies
Keep legitimate repeated purchases and remove only transactions you can verify as duplicated.
ONE LOCAL ENGINE, MULTIPLE JOBS
Use the checker that matches the source.
TOOL
Bank CSV to QuickBooks converter and preflight checker
Check and normalize a copied bank CSV into a review-ready QuickBooks three-column format without uploading the file.
Open free tool →TOOLStripe to QuickBooks CSV converter and error checker
Map a Stripe balance-transactions CSV to a clean Date, Description and Net Amount preview for QuickBooks, locally in your browser.
Open free tool →NEED THE REPAIRED EXPORT?
Take the complete engine offline.
Unlimited local scans, clean three- or four-column CSV downloads and a reject report.
Get CSV Preflight Local · $29 CAD