Free Online Security ASN.1 Messages Decoder

This online decoder allows decoding of ASN.1 encoded security messages (PDU). No ASN.1 syntaxes are required. Simply choose the ASN.1 interface you want to use and supply the data.

Available ASN.1 syntaxes are PKCS #1 (RFC 3447), PKCS #10 (RFC 2986), PKCS #15 (RSA), PKIX Certificate and CRL Profile (X.509/RFC 5280), and Cryptographic Message Syntax (RFC 5652).

For other application domains please use another decoder on the right.

Supported ASN.1 encoded inputs are raw (binary), Base64 or hexadecimal format. The generated output is in XML format.


Decode from file upload

  1. Select a security message (*):

  2. Upload the ASN.1 encoded message (max. 500 KB). Only the first PDU from the file will be decoded.

  3. Specify the format of the input file:
    Base64
    Binary
    Hexadecimal


Decode from direct input

  1. Select a security message (*):

  2. Copy below your base64 encoding (max. 100 KB). Only the first PDU will be decoded.


THIS FREE ONLINE ASN.1 DECODER SERVICE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. MARBEN PRODUCTS SHALL HAVE NO LIABILITY FOR ANY DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES IN ANY WAY RELATED TO THE USE OF THIS SERVICE, REGARDLESS OF WHETHER THE CLAIM FOR SUCH DAMAGES IS BASED IN CONTRACT, TORT, OR ANY OTHER LEGAL THEORY. IN NO EVENT SHALL MARBEN PRODUCTS BE LIABLE FOR ANY LOSS OF PROFITS OR OTHER SPECIAL OR CONSEQUENTIAL DAMAGES, EVEN IF MARBEN PRODUCTS HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.

Privacy Policy: Your data will be deleted after decoding

(*) We're constantly adding and updating the ASN.1 interfaces. Do not hesitate to contact us if you need other ASN.1 interfaces.