Can I merge several bank CSV files?

Yes. BankFileFix combines multiple bank exports, detects overlapping periods and identifies duplicates.

Does BankFileFix upload my bank statement?

No. CSV and Excel files are processed locally in the browser.

Merge Multiple Bank CSV Files

Drop several monthly or quarterly bank exports at once. BankFileFix normalizes them, merges the transactions, sorts by date, detects overlapping periods and flags possible duplicates.

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Drop CSV or Excel files here, or click to choose.

.csv, .xls, .xlsx — drop several to merge & de-duplicate

🔒 No signup. No uploads. Your financial data stays on your device.

· transactions · need review Ready to export · junk removed Date format

possible duplicate transactions found.

Overlapping date ranges detected:

Header row

Flip debit/credit signs (bank uses the opposite convention)

Dates were ambiguous — interpreted as . Pick the correct format:

Date	Source	Description	Amount	Balance	Status
					Needs review OK

Export for

Date format Keep zero-value rows Detailed export

Excel is a binary file — download to view.

This job is larger than One-Time Fix

Your cleanup exceeds 5,000 transactions / 10 files. The Bookkeeper plan for high-volume work is coming soon.

See plans

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Useful for

Catch-up bookkeeping
Historical bank imports
New client onboarding
Filling gaps from missing bank feeds
Importing older transactions

How merging works

Every file is cleaned to the same shape first, so they combine cleanly even when banks use different layouts. Overlapping date ranges are highlighted, and duplicate transactions are flagged so you can remove them before export.

Related tools

Frequently asked questions

Can I merge several bank CSV files?: Yes. BankFileFix combines multiple bank exports, detects overlapping periods and identifies duplicates.
Does BankFileFix upload my bank statement?: No. CSV and Excel files are processed locally in the browser.