Repair padding, line endings, hashes, counts and control totals. Free, no signup, and your file is processed locally in your browser.
Primary topic: ACH file repair tool
The ACH file repair tool rebuilds mechanical NACHA controls when an otherwise usable file has count, total, padding or line-ending problems. Use this ACH file repair tool as a practical first step, then review its results carefully. repair does not prove that payment instructions are correct, authorized or acceptable to your bank.
A reliable ACH file repair tool workflow starts by confirming the business purpose before changing or exporting any data. This page is designed for rebuilds mechanical NACHA controls when an otherwise usable file has count, total, padding or line-ending problems. It performs the supported work locally, so the source does not need to be sent to a conversion service. Use the ACH file repair tool with an approved source and a clearly defined expected result.
Start with an ACH file with parseable records and repairable structural or control-value errors. 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 repaired copy with recalculated batch controls, file controls, block count and type 9 padding. Before transmission or downstream import, review the before-and-after diagnostics, file totals, entry hashes, record ordering and any issues the repair cannot resolve, save the source separately and follow your organization’s approval process.
Confirm that the selected input really contains an ACH file with parseable records and repairable structural or control-value errors. 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. repair does not prove that payment instructions are correct, authorized or acceptable to your bank. Ask the ODFI for the rejection code and compare it with the company profile, identifiers and processing date.
It rebuilds mechanical NACHA controls when an otherwise usable file has count, total, padding or line-ending problems. The ACH file repair tool processes the data locally in your browser and does not require an account.
It needs an ACH file with parseable records and repairable structural or control-value errors. Files remain on your device during processing.
You will get a repaired copy with recalculated batch controls, file controls, block count and type 9 padding. Review the result before using it in an operational workflow.
Check the before-and-after diagnostics, file totals, entry hashes, record ordering and any issues the repair cannot resolve. Also remember that repair does not prove that payment instructions are correct, authorized or acceptable to your bank.
No. Processing creates a separate result in browser memory and leaves the source file unchanged. Keep the original as the audit baseline until the new output has been reviewed and accepted.
Confirm that the files share compatible originator and processing settings, then review the before-and-after diagnostics, file totals, entry hashes, record ordering and any issues the repair cannot resolve. Do not rely on matching filenames or creation dates alone.
When the tool creates a new ACH output, it rebuilds affected counts, hashes, debit and credit totals, batch controls, file controls, block count and padding from the resulting entries.
Preserve the source, review a preview, validate the output and obtain any required approval before transmission. repair does not prove that payment instructions are correct, authorized or acceptable to your bank.
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.