Create a reviewable reversal file from the original ACH instructions. Free, no signup, and your file is processed locally in your browser.
Primary topic: ACH reversal generator
Reversals are permitted only for specific circumstances and timeframes. Confirm eligibility with your bank before transmitting the generated file.
The ACH reversal generator builds a reviewable reversal file from original ACH instructions when a qualifying erroneous entry must be reversed. Use this ACH reversal generator as a practical first step, then review its results carefully. reversals are restricted and time-sensitive; confirm the case with your ODFI before submitting the output.
A reliable ACH reversal generator workflow starts by confirming the business purpose before changing or exporting any data. This page is designed for builds a reviewable reversal file from original ACH instructions when a qualifying erroneous entry must be reversed. It performs the supported work locally, so the source does not need to be sent to a conversion service. Use the ACH reversal generator with an approved source and a clearly defined expected result.
Start with the original ACH file and the entries that meet your organization’s approved reversal criteria. 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 new reversal file with corresponding transaction directions, descriptions, traces and recalculated controls. Before transmission or downstream import, review eligibility, timing, amount, receiver, original trace references, company description and approval documentation, save the source separately and follow your organization’s approval process.
Confirm that the selected input really contains the original ACH file and the entries that meet your organization’s approved reversal criteria. 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. reversals are restricted and time-sensitive; confirm the case with your ODFI before submitting the output. Ask the ODFI for the rejection code and compare it with the company profile, identifiers and processing date.
It builds a reviewable reversal file from original ACH instructions when a qualifying erroneous entry must be reversed. The ACH reversal generator processes the data locally in your browser and does not require an account.
It needs the original ACH file and the entries that meet your organization’s approved reversal criteria. Files remain on your device during processing.
You will get a new reversal file with corresponding transaction directions, descriptions, traces and recalculated controls. Review the result before using it in an operational workflow.
Check eligibility, timing, amount, receiver, original trace references, company description and approval documentation. Also remember that reversals are restricted and time-sensitive; confirm the case with your ODFI before submitting the output.
Collect the original ACH file and the entries that meet your organization’s approved reversal criteria. Keep the bank-approved company settings separate from receiver details so they can be reviewed independently before generation.
Yes. Entry and addenda counts, routing hashes, debit and credit totals, batch controls, file controls, block count and type 9 padding are rebuilt from the current entries.
The software can create a technical file, but it cannot establish authorization. You remain responsible for the authorization, notice, timing and record-retention requirements that apply to each entry.
Record approved company and ODFI settings in your controlled internal documentation. Recheck them whenever your bank relationship, account, SEC code or processing instructions change.
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.