UtilFoundryDEV TOOLS

ASN.1 DER Inspector

Walk the tag-length-value structure of a DER encoded blob and show how it nests.

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  • Runs in your browser
  • No data is uploaded
Local saving paused

Private to this browser, not a cloud backup. Saves expire 7 days after the last save. Avoid saving sensitive data on shared devices.

This input may contain credentials or sensitive data. Local saving is paused; use sanitized test data instead.

Saved ASN.1 DER Inspector workspaces

Saved only on this device. Clearing browser data removes your workspaces. Expired saves are removed when this app next checks storage.

No saved workspaces for this tool yet.

No settings needed
Hex to DER structure

Input

Paste or edit your hex bytes, then click “Run tool”.

Type, paste or drop a file
Hex
Ln 1, Col 1Spaces: 2UTF-835 bytes

Output

DER structure (read-only).

Read-only
Text
Ln 1, Col 1Spaces: 2UTF-80 bytes
Ready when you arePaste your input, then press Run tool or ⌘ ↵