Japanese Bank Account Batch Formatter
Batch-prepare Japanese bank transfer rows for Zengin upload — bank lookup, half-width katakana, fixed-width export.
Japanese Bank Account Batch Formatter
Clean, validate, and prepare recipient data for Zengin bank transfer uploads. Converts names to half-width katakana automatically.
Sender Account (for .txt export)
Required to generate a valid Zengin header record. Saved on this device so you only enter it once.
Batch Import
Validated Rows
No account data yet
Import a batch or add a single row to start validating and formatting for Zengin upload.
Common Problems
Why do my bank transfer files get rejected by the portal even when the data looks correct?
Rejections are frequently caused by hidden whitespace or character encoding mismatches that the banking system cannot interpret. This tool explicitly sanitizes the text and forces the strict hankaku format that banking gateways demand for processing.
Can I process thousands of records at once?
While the tool is optimized for batch processing, browser memory limitations apply to extremely large datasets. It is recommended to process files in chunks of 500-1000 rows to ensure optimal performance and reliable validation checks.
What happens if a bank branch code is not found in the lookup?
If a code is missing, the tool highlights the row in red and prompts for manual verification to prevent data corruption. You will need to confirm the correct branch code via the official bank directory before the row can be marked as valid for export.
Does the tool store my recipient's bank account information locally?
No, this tool runs entirely in your browser as a client-side application to ensure your financial data remains private. Once you refresh the page or close your browser, all input data is cleared and nothing is transmitted to any external server.
Is it possible to use this for international bank transfers?
This tool is specifically designed for the Japanese domestic Zengin network and does not support SWIFT or other international banking formats. Attempting to use these outputs for international transfers will result in failed transactions or bank communication errors.
Workflow
What is Japanese Bank Account Batch Formatter?
Preparing accurate Zengin-format data is a critical requirement for automated bank transfers in Japan, as strict formatting constraints often lead to upload errors. This tool validates bank and branch code structures while automatically converting recipient names into the required half-width katakana (hankaku).
By providing a clear interface for batch entry and verification, it significantly reduces the manual overhead and risk of rejection associated with manual file construction. Developers and accounting staff can now process large volume transfer lists with confidence, ensuring compliance with banking system specifications.
How to use Japanese Bank Account Batch Formatter
First fill in Sender Account at the top with your own company name, sending bank account, and transfer date (this is saved on your device so you only enter it once). Then switch between Single Entry or Batch Import modes to input recipient data. For batch processing, paste CSV or TSV values in the following order: Recipient Name, Bank Code, Branch Code, Account Type (1, 2, or 4), Account Number, and Transfer Amount. The system validates bank code (4 digits), branch code (3 digits), account number (7-8 digits), and transfer amount (positive integer) in real time, and automatically converts recipient names to compliant half-width Katakana. Export .txt only becomes enabled once Sender Account is complete and every row is valid — it then generates a full Zengin file with header, data, trailer, and end records.
Example
Input: サトウ ケンジ, 0005, 001, 1, 1234567, 30000
Recipient name converted to half-width: ｻﾄｳ ｹﾝｼﾞ
Data record (Zengin format, 120 bytes):
Field Value
Type 2
Bank code 0005
Branch code 001
Account type 1 (ordinary)
Account number 1234567
Recipient name ｻﾄｳ ｹﾝｼﾞ
Transfer amount 00030000 (¥30,000)
If Sender Account is not filled in, Export .txt stays disabled — the header record needs real sender data to be valid.Use Cases
1. Streamlining monthly payroll transfers for distributed contractor teams in Japan.
2. Generating compliant bulk payment files for automated accounts payable systems.
3. Converting legacy Excel recipient lists into machine-readable Zengin upload formats.
4. Validating and fixing incorrect half-width character encodings in existing payment databases.
FAQ
Does this tool support all Japanese banks?
The tool includes a comprehensive database of major national banks, trust banks, and popular regional institutions. If a specific local credit union is missing, you can manually input the bank and branch code to ensure the format remains consistent.
How does the tool handle full-width katakana conversion?
The system utilizes a built-in character mapping engine that automatically detects full-width kana (zenkaku) and converts it into the standardized half-width (hankaku) format required by the Zengin specification. It also strips prohibited special characters that often cause system rejections.
Is the exported file compatible with all banking portals?
The output is generated following the standard Zengin Data Format (ZEDI) requirements. While most major Japanese banking portals use this standard, you should verify if your specific institution requires additional custom header rows.