ACH File Validator and Viewer
Upload or paste an existing ACH/NACHA file to inspect record structure, totals, entry hash, and block padding. The file is not uploaded, logged, or stored.
Need to build a file from spreadsheet data instead? Use the generator or start from the import template. To see what a valid file looks like, open one of the NACHA file examples.
If your bank accepted the file and an individual entry came back days later, that is a return rather than a format error — look the reason up in the ACH return code list.