encutil

Encoding/Decoding Utility CLI - encode and decode base64, hex, URL, HTML entities, hash strings/files, and decode JWTs.

Installation

pip install encutil

Usage

All commands accept input as an argument, from -f FILE, or from stdin.

Base64

encutil b64e "hello world"           # SGVsbG8gV29ybGQ=
encutil b64d "SGVsbG8gV29ybGQ="       # hello world
echo "secret" | encutil b64e         # c2VjcmV0Cg==

Hex

encutil hex "hello"                  # 68656c6c6f
encutil unhex "68656c6c6f"           # hello

URL Encoding

encutil url "hello world"            # hello%20world
encutil unurl "hello%20world"        # hello world
encutil url "key=value&foo=bar"      # key%3Dvalue%26foo%3Dbar

HTML Entities

encutil html "<script>alert('xss')</script>"
# &lt;script&gt;alert(&#x27;xss&#x27;)&lt;/script&gt;

encutil unhtml "&lt;script&gt;"      # <script>

Hashing

encutil hash sha256 "password"       # 5e884898da28...
encutil hash md5 "text"              # 1cb251ec0d56...
encutil hashfile sha256 myfile.txt   # Hash a file

Supported algorithms: md5, sha1, sha256, sha512, sha224, sha384

JWT Decoding

Decode JWT tokens without verification (extracts header and payload):

encutil jwt "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c"

# Header:
# {
#   "alg": "HS256",
#   "typ": "JWT"
# }
#
# Payload:
# {
#   "sub": "1234567890",
#   "name": "John Doe",
#   "iat": 1516239022
# }

Auto-Detect Encoding

Try multiple decodings and show what works:

encutil detect "SGVsbG8gV29ybGQ="

# BASE64:
# Hello World

JSON Output

All commands support --json for machine-readable output:

encutil b64e "hello" --json          # {"base64": "aGVsbG8="}
encutil hash sha256 "test" --json    # {"algorithm": "sha256", "hash": "9f86d08..."}

File Input

Read from file with -f:

encutil b64e -f secret.txt
encutil hashfile sha256 myfile.bin

For AI Agents

See SKILL.md for AI-agent-friendly documentation.

License

MIT