The offline edition

The same tools, as self-contained HTML files that run from your disk. For the messages you are not allowed to paste into a website.

Why this exists

The free tools on this site already parse everything in your browser — nothing is uploaded. That is true, and it is also beside the point, because you cannot prove it to your security team from inside a browser tab.

So what actually happens is this: you sanitise a message, or retype one from a screenshot, or work with a sample that is close enough. The real one — the one with the PAN, the track data, the cryptogram, the one you are actually debugging at 2 a.m. — gets read by counting bytes by hand.

The offline edition removes the argument. The files sit on your disk. They contact nothing. You can disconnect the machine and they still work.

What you get

15 self-contained HTML files — the ISO 8583 message parser, the Mastercard IPM clearing file parser, and every lookup and decoder on this site
No install — no runtime, no account, no licence key. Open a file in a browser
No network, at all — no analytics, no ads, no fonts, no CDN. Verify it with your network panel or by pulling the cable
Each file works alone — copy one onto an air-gapped box and it still runs

How it differs from the free site

	Free site	Offline edition
Parsing	In your browser	In your browser
Runs without a network	No	Yes
Ads and analytics	Yes	None
Works inside a locked-down network	Usually blocked	Yes
Articles and reference tables	Yes	Linked back to the site

If you only ever work with test data, the free site is the same tool and costs nothing. This edition is for when that stops being enough.

Get it

US$39, paid in USDT. One purchase, one person, as many machines as you use.

Pay with USDT →

No account, no email address asked for. The download link appears as soon as the transfer clears and stays valid for 7 days. Team licences and invoices: [email protected]

A note on what this is not: a browser tab is not a vault. This edition removes the network from the equation; the usual rules about the machine you handle live cardholder data on still apply.