Edit ACH entries and rebuild all control totals safely. Free, no signup, and your file is processed locally in your browser.
Primary topic: ACH file editor
The ACH file editor lets you change selected ACH entry values and then rebuilds dependent NACHA control records. Use this ACH file editor as a practical first step, then review its results carefully. keep the original file, document authorized changes and never use editing to bypass bank or receiver approval.
A reliable ACH file editor workflow starts by confirming the business purpose before changing or exporting any data. This page is designed for lets you change selected ACH entry values and then rebuilds dependent NACHA control records. It performs the supported work locally, so the source does not need to be sent to a conversion service. Use the ACH file editor with an approved source and a clearly defined expected result.
Start with an existing ACH file whose entries, amounts, receiver details or other supported fields need correction. 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 an updated NACHA file with entry counts, hashes, totals, block count and padding recalculated. Before transmission or downstream import, review every edited value, resulting transaction codes, totals, trace numbers and validation diagnostics, save the source separately and follow your organization’s approval process.
Confirm that the selected input really contains an existing ACH file whose entries, amounts, receiver details or other supported fields need correction. 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. keep the original file, document authorized changes and never use editing to bypass bank or receiver approval. Ask the ODFI for the rejection code and compare it with the company profile, identifiers and processing date.
It lets you change selected ACH entry values and then rebuilds dependent NACHA control records. The ACH file editor processes the data locally in your browser and does not require an account.
It needs an existing ACH file whose entries, amounts, receiver details or other supported fields need correction. Files remain on your device during processing.
You will get an updated NACHA file with entry counts, hashes, totals, block count and padding recalculated. Review the result before using it in an operational workflow.
Check every edited value, resulting transaction codes, totals, trace numbers and validation diagnostics. Also remember that keep the original file, document authorized changes and never use editing to bypass bank or receiver approval.
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 every edited value, resulting transaction codes, totals, trace numbers and validation diagnostics. 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. keep the original file, document authorized changes and never use editing to bypass bank or receiver approval.
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.