100% Client-Side No data leaves your browser

ASN.1 Decoder

Parse BER/DER encoded structures into a recursive tree view

ASN.1 Hex Data
Decoded Tree
// Paste ASN.1 hex data and click "Decode ASN.1" to show the tree representation.

Related Tools

🏷️

EMV Tag Inspector

Decode EMV tags and TLV data
📡

ISO 8583 Studio

Parse full ISO 8583 messages
📖 About This Tool

What is the ASN.1 Decoder?

The ASN.1 Decoder parses Abstract Syntax Notation One (ASN.1) encoded data structures using DER/BER encoding rules. It is used for decoding X.509 certificates, PKCS structures, and other ASN.1-encoded data in payment security.

🛠️ How to Use
  1. Enter the hex-encoded ASN.1 data.
  2. Click Decode to parse the structure.
  3. Navigate the decoded tree of tagged values.
❓ FAQ

What is ASN.1 used for in payments?

ASN.1 encoding is used in X.509 certificates for TLS/SSL, EMV certificate authority public keys, RSA key structures, and PKCS#7/CMS signed data structures used in 3D Secure and payment gateway authentication.