ISO 8583 Bitmap Decoder
Turn a primary (and secondary) bitmap in hex into the list of data elements present.
Tool inputs stay in your browser · optional AI search sends your query
Good to know: Bit 1 set means a secondary bitmap (fields 65–128) follows. Field names follow ISO 8583:1987.
How to use it (step by step)
- 1Fill in the boxes: “Bitmap hex (16 or 32 characters)”. Example numbers are already there so you can see how it works; replace them with yours.
- 2The result updates instantly as you type (on a phone it is below the boxes).
- 3The bold line is the main answer. Tap Copy next to any value to copy it.
Words to know
- ISO 8583
- The common “language” card machines and banks use to send payment messages to each other.
- Hex / binary
- Other ways of writing numbers. Binary uses only 0 and 1; hex uses 0–9 and A–F.
- Array / list
- An ordered collection of items, like ["apple", "banana"]. Every programming language has one.
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