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What is an Encoder/Decoder?
Encoding transforms text or binary data into a different representation so it can be safely transported, stored, or embedded in a target medium. Decoding reverses the process to recover the original content. Unlike encryption, encoding is not a security mechanism — the transformation is entirely reversible and publicly defined. Common uses include transmitting binary data over text-based protocols, embedding special characters safely in HTML or URLs, and inspecting authentication tokens.
Supported Formats
| Format | Encode example | Use case |
|---|---|---|
| Base64 | Hello → SGVsbG8= | Email attachments, data URIs, JWT |
| URL Encode | a b → a%20b | Query strings, form data |
| HTML Entities | <b> → <b> | Safe HTML output |
| Hex | A → 41 | Debugging, binary inspection |
| Binary | A → 01000001 | Low-level analysis |
| Octal | A → \101 | Unix file permissions, C escape sequences |
| ASCII Codes | Hi → 72 105 | Protocol debugging |
| Unicode Escape | © → \u00A9 | JavaScript source, JSON |
| JWT Decode | eyJ… → header + payload JSON | Inspect tokens without a library |
Chain Encoding
The chain feature applies two encoding steps in sequence. For example, selecting Hex → Base64 first converts each character to its hex code, then Base64-encodes the result. This is useful for simulating multi-layer encoding found in obfuscated payloads or CTF challenges.
Related Tools
Encode Base64 → Base64 Encoder
Encode URLs → URL Encoder
Encode HTML entities → HTML Entity Encoder