Compare two ACH files while ignoring routine creation metadata. Free, no signup, and your file is processed locally in your browser.
Primary topic: ACH file comparison tool
The ACH file comparison tool compares two NACHA files semantically so meaningful payment changes are easier to distinguish from routine metadata. Use this ACH file comparison tool as a practical first step, then review its results carefully. review differences in business context because a technically small change can still move money to a different account.
A reliable ACH file comparison tool workflow starts by confirming the business purpose before changing or exporting any data. This page is designed for compares two NACHA files semantically so meaningful payment changes are easier to distinguish from routine metadata. It performs the supported work locally, so the source does not need to be sent to a conversion service. Use the ACH file comparison tool with an approved source and a clearly defined expected result.
Start with a baseline ACH file and a second ACH file that represents the changed or regenerated version. 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 difference report covering batches, entries, amounts, receiver data, addenda and control values. Before transmission or downstream import, review added, removed and changed entries, totals, effective dates, identifiers and any ignored creation metadata, save the source separately and follow your organization’s approval process.
Confirm that the selected input really contains a baseline ACH file and a second ACH file that represents the changed or regenerated version. 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. review differences in business context because a technically small change can still move money to a different account. Ask the ODFI for the rejection code and compare it with the company profile, identifiers and processing date.
It compares two NACHA files semantically so meaningful payment changes are easier to distinguish from routine metadata. The ACH file comparison tool processes the data locally in your browser and does not require an account.
It needs a baseline ACH file and a second ACH file that represents the changed or regenerated version. Files remain on your device during processing.
You will get a difference report covering batches, entries, amounts, receiver data, addenda and control values. Review the result before using it in an operational workflow.
Check added, removed and changed entries, totals, effective dates, identifiers and any ignored creation metadata. Also remember that review differences in business context because a technically small change can still move money to a different account.
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 added, removed and changed entries, totals, effective dates, identifiers and any ignored creation metadata. 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. review differences in business context because a technically small change can still move money to a different account.
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.