Convert a CSV payment file into a bank-ready NACHA-formatted ACH file. Free, no signup, and your file is processed locally in your browser.
Primary topic: CSV to ACH converter
The CSV to ACH converter turns mapped CSV payment rows into a structured NACHA payment file. Use this CSV to ACH converter as a practical first step, then review its results carefully. validate the downloaded file and confirm the originator settings with your bank before sending live payments.
A reliable CSV to ACH converter workflow starts by confirming the business purpose before changing or exporting any data. This page is designed for turns mapped CSV payment rows into a structured NACHA payment file. It performs the supported work locally, so the source does not need to be sent to a conversion service. Use the CSV to ACH converter with an approved source and a clearly defined expected result.
Start with a CSV containing receiver names, routing numbers, account numbers, amounts, account types and credit or debit instructions. Work from a copy, preserve leading zeros and remove unrelated report headings or totals that could be mistaken for transaction data.
Use the on-page controls, then compare the displayed batch count, entry count, total debits and total credits with the source expectation. Investigate warnings instead of assuming that a downloadable result is correct.
The expected result is a downloadable ACH file with file, batch, entry and control records rebuilt from the mapped payment data. Before transmission or downstream import, review column mapping, effective date, SEC code, company identifiers, totals and your bank’s required file settings, save the source separately and follow your organization’s approval process.
Confirm that the selected input really contains a CSV containing receiver names, routing numbers, account numbers, amounts, account types and credit or debit instructions. A renamed extension does not convert a spreadsheet, PDF or binary export into a valid ACH-related source.
Compare entries one batch at a time. Missing rows, duplicated rows, amount scaling, debit-versus-credit selection and malformed addenda can all change counts or monetary totals.
Format validation does not verify enrollment or bank policy. validate the downloaded file and confirm the originator settings with your bank before sending live payments. Ask the ODFI for the rejection code and compare it with the company profile, identifiers and processing date.
It turns mapped CSV payment rows into a structured NACHA payment file. The CSV to ACH converter processes the data locally in your browser and does not require an account.
It needs a CSV containing receiver names, routing numbers, account numbers, amounts, account types and credit or debit instructions. Files remain on your device during processing.
You will get a downloadable ACH file with file, batch, entry and control records rebuilt from the mapped payment data. Review the result before using it in an operational workflow.
Check column mapping, effective date, SEC code, company identifiers, totals and your bank’s required file settings. Also remember that validate the downloaded file and confirm the originator settings with your bank before sending live payments.
Start with a CSV containing receiver names, routing numbers, account numbers, amounts, account types and credit or debit instructions. Preserve leading zeros in routing and account numbers, confirm whether amounts are dollars or cents, and review every mapped column before conversion.
Usually, yes. The source does not need one exact column order, but each required ACH field must map to a usable value. Remove report titles, subtotal rows and blank header lines first.
Common causes include currency text, formulas returning blanks, negative values, hidden subtotal rows or an incorrect debit and credit mapping. Compare the source row count and total with the on-page summary.
The output follows the supported NACHA structure, but acceptance also depends on your ODFI profile, approved SEC codes, effective dates and identifiers. validate the downloaded file and confirm the originator settings with your bank before sending live payments.
Technical explanations are checked against these primary sources. Bank-specific requirements can be narrower than general format guidance.
Sources reviewed August 20, 2026. Nacha owns and maintains the linked materials.
ACH files use the NACHA fixed-width format: every record is 94 characters, files contain one or more batches, and control records reconcile entry counts, routing-number hashes, debits and credits. Always confirm bank-specific settings with your financial institution before uploading a production file.