Tools · in the browser

Payment cryptography calculators, no install

The same DES/3DES, DUKPT, TR-31, key-component, PIN-block and EMV tools as the desktop app, compiled to WebAssembly from the same Kotlin code. Keys and card data stay on this page: nothing you type is sent anywhere.

Downloading the calculator engineWASM
Needs WebAssembly GC: Chrome/Edge 119+, Firefox 120+, Safari 18.2+Prefer an app? Download ISO8583Studio
ISO8583Studio toolsDownloading the calculator engineWASM

MAC Tools

ANSI X9.9 & X9.19: ANSI X9.9 and X9.19 MACs

ANSI X9.9 single-DES and X9.19 retail MACs for financial messages, including ISO 8583 field 64 and 128 MACs.

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More MAC Tools

48 payment cryptography tools, free in your browser

Every calculator below is the desktop app's own Kotlin code compiled to WebAssembly. Each has its own page; open one and the app starts on it.

EMV & Card Tools

Cryptographic Tools

Key Management

Payment Utilities

Card Validation

DUKPT Tools

  • DUKPT ISO 9797DUKPT calculator · Derived unique key per transaction (ISO 9797)
  • DUKPT ISO AESAES DUKPT calculator · Derived unique key per transaction (AES)

MAC Tools

Data Converters