SMUGGLR — Unicode Steganography Toolkit

Zero-Width Character Steganography

Encodes your secret as invisible binary using U+200B (ZWSP = 0) and U+200C (ZWNJ = 1), stitched inside cover text. Output is visually identical to normal text.

Cover Text //visible

Secret Message //hidden

Output

// encoded output appears here

Unicode Tag Block (U+E0000)

Uses chars from U+E0000–U+E007F — originally for emoji flag sequences. Used in AI-generated text watermarking. Completely invisible in every modern app and browser.

Carrier Text / Emoji

Secret Message

Output

// smuggled output appears here

Homoglyph Substitution

Replaces Latin letters with visually identical Unicode chars from Cyrillic, Greek & other scripts. Text looks normal to the eye but is technically different — bypasses keyword filters and fingerprints documents.

Input Text

Full substitution (all mappable chars) Partial (every 2nd char)

Output

// substituted text appears here

Glyph Reference — lookalike pairs

Zalgo / Combining-Mark Corruptor

Stacks invisible Unicode combining diacritics above, below, and through text — creating the "cursed" or "glitched" aesthetic. Intensity is fully adjustable.

Input Text

Up 4

Mid 1

Down 5

Randomize per character

Output

// corrupted text appears here

Whitespace Unicode Cipher

Encodes binary data using two different Unicode space characters — U+2003 EM Space (bit 1) and U+2002 EN Space (bit 0) — as word separators. Visually indistinguishable from normal spaces.

Cover Sentence

Secret (keep short)

Output

// output appears here

Emoji Smuggler — Variation Selector Steganography

Based on Paul Butler's February 2025 research. Each UTF-8 byte of your secret maps to one of 256 invisible Unicode Variation Selectors (U+FE00–FE0F and U+E0100–E01EF) appended directly after a carrier emoji. The result looks like a single normal emoji but carries an arbitrary hidden payload — survives copy-paste across all platforms.

Encoding Method

Paul Butler's method (recommended). Every UTF-8 byte of your secret → one invisible variation selector. Bytes 0–15 → U+FE00..FE0F · Bytes 16–255 → U+E0100..E01EF. One emoji can carry unlimited bytes. Completely undetectable visually. Survives copy-paste everywhere.

Appends invisible Unicode Tag Block characters (U+E0001 language tag + one char per byte) after the emoji. The same technique found in AI watermarking systems. Zero visual difference on any renderer.

Encodes each bit as U+200D ZWJ (= 1) or U+200C ZWNJ (= 0) between copies of the carrier emoji. Requires 1 emoji per bit — keep secrets very short (3–5 chars). The output chain looks like a sequence of the same emoji repeated.

Pick Carrier Emoji

😊

Smiling Face

U+1F60A

∞ bytes capacity

Secret Message //will be hidden inside the emoji

Smuggled Emoji

// smuggled emoji appears here

Decode — paste any smuggled emoji

Decoded Secret

// decoded message appears here

Steganography Inspector

Paste any suspicious text to scan for all 7 hiding techniques: zero-width chars, tag block (E0000), variation selector encoding, ZWJ chains, Zalgo marks, whitespace anomalies, and homoglyphs — with automatic decoding.

Paste Suspicious Text