ACH File Converter

Split ACH Files

Split a multi-batch ACH file into separate validated files.

1

Source ACH/NACHA file

Validate every split output

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Continue with a tool that fits the next step in this workflow.

How batches become separate files

Each selected batch keeps its header, entries, addenda, and Batch Control while receiving the file-level envelope needed for an independent NACHA file.

Controls recalculated for each output

File batch count, entry and addenda count, entry hash, debit and credit totals, block count, creation values, and padding are generated for the records in that output.

Ways to decide the split boundary

  • Company or originator approval.
  • SEC code or payment purpose.
  • Effective date or delivery window.
  • Bank, destination, or downstream processor.

Operational risks after splitting

A split changes file identities and may change transmission sequencing. Track which payments went to each output and prevent the source and split copies from both being sent.

Questions about splitting ACH files

Can one batch be divided into smaller batches?

This workflow separates existing batches. Dividing entry populations may require a controlled recreation process.

Are the split files padded?

Yes. Each output receives its own File Control, block count, and type 9 padding.

Can I send both the source and split files?

That can duplicate payments. Treat the outputs as replacements only under an approved delivery plan.

Which authoritative sources support this page?

Technical explanations are checked against these primary sources. Bank-specific requirements can be narrower than general format guidance.

  1. Nacha ACH File Details — Official record-field guidance, including Batch Header SEC codes and addenda capabilities.
  2. Nacha ACH File Overview — Official explanation of files, batches, entries, controls, and batch grouping.
  3. Nacha: How ACH Works — Official overview of ACH participants, consumer and corporate payments, and authorization responsibilities.
  4. Nacha Operating Rules Topics — Current rule changes and implementation topics published by Nacha.

Sources reviewed August 20, 2026. Nacha owns and maintains the linked materials.