Zero-Width Steganography Encoder
Bounded lossless byte-hex steganographic encoder using U+200B/U+200C bits. No encryption, authentication or robustness to text normalization.
Description
Encode up to 128 payload bytes as a U+200B/U+200C bit stream.
Zero-width characters can represent a byte stream without rendering ordinary visible glyphs. This encoder produces the strict two-character format accepted by the paired decoder.
When to use this tool
Encode up to 128 payload bytes as a U+200B/U+200C bit stream. Use it when the input measurements and conventions below match the operation you need.
- Prepare payloadHex, respecting the measurement basis and boundaries below.
- Compare the worked example with your intended operation before reusing its result.
How to use the tool and how it works
- Enter every field in the input table using the stated units and exact supported selector spelling where applicable.
- Run the tool. Correct input errors before interpreting an output.
- Read the result fields below; use accompanying flags and the stated sign, boundary or model convention when interpreting a number.
The input is an even-length hexadecimal string of at most 256 digits, representing up to 128 bytes. It expands each byte most-significant bit first, maps zero to U+200B and one to U+200C, and joins the characters without separators; empty input gives empty output.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| payloadHex | Payload hex. | Text |
| Output field | Interpretation |
|---|---|
| result | Object containing the following named result fields. |
| result.encodedText | Encoded text; use the stated units and sign convention. |
{
"input": {
"payloadHex": "41"
},
"output": {
"result": {
"encodedText": "\u200b\u200c\u200b\u200b\u200b\u200b\u200b\u200c"
}
}
}Limitations and assumptions
- The output is an encoded stream, without attached cover text, encryption or authentication. Text sanitation can remove these characters and make the payload unrecoverable.
- Every declared field is required and unexpected fields are rejected. Numeric inputs must be finite; input errors are distinct from a valid false result or an explicitly qualified output.
- Extremely large inputs and nonfinite or excessively large outputs are rejected. List positions reported by the tool use zero-based indices unless stated otherwise.
Alternative or Complementary methods
Use the applicable protocol specification and a reviewed implementation for real verification, hashing or key management. A format label, probability model or tentative text mapping does not replace that operation. Compare the scope of the nearby tools below before substituting one.
References
Similar or alternative tools
- Zero-Width Steganography Decoder
Bounded lossless byte-hex steganographic decoder using U+200B/U+200C bits. No encryption, authentication or robustness to text normalization.
- Whitespace Steganography Encoder
Bounded lossless byte-hex steganographic encoder using one space/tab bit per line. No encryption, authentication or robustness to text normalization.