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While the full version is paid, the free trial or viewer mode from Objective Systems allows you to analyze data using BER, DER, CER, and PER rules. Top Free Online ASN.1 Decoders (No Download Required)
Below is a guide to the best free and open-source ASN.1 decoders available for download or online use in 2026.
A specialized .NET-based tool that allows you to display, edit, and convert ASN.1-encoded data. It is particularly useful for working with digital certificates and security protocols. Download it at Sysadmins LV .
This tool is designed for decoding binary data encoded with Basic Encoding Rules (BER). It features a user-friendly tree view that highlights tags, lengths, and values in different colors. You can download it from dtvTools or Softpedia .