Encode / Decode
Hide a message inside a cover sentence, or pull a hidden message back out. Two methods: spacing between words, and invisible Unicode characters.
Method 1
Single space between two words = bit 0, double space = bit 1. Your cover text needs at least as many word-gaps as your secret needs bits (8 bits per character, plus an 8-bit terminator). Longer cover text = more capacity.
Method 2
The secret is converted to binary and hidden as invisible Unicode characters (U+200B / U+200C) spliced right after the first word, ending in a U+200D marker. Capacity is essentially unlimited, but some apps strip invisible characters on paste — test your destination first.