The tables you look up most while debugging a message, plus the bitmap you have to compute. Like the parser, everything runs in your browser — nothing you type is uploaded.
Read a settlement file as fields instead of hex — in your browser, nothing uploaded
Look up what a code means, or pull one message value apart
The high-frequency fields — type a value, get the meaning
EMV tags, AIDs, currency codes, merchant categories
The same bytes in another base, or another encoding
The ones that compute rather than look up
Every table on this page is also published as JSON and CSV — 637 entries with English and Chinese labels, and the ISO 4217 minor-unit exponent you need to place the decimal point in DE4. CC BY 4.0, no dependencies: github.com/lizhi5753186/iso8583-data