Invisible Ink

Hide a secret in zero-width chars.

Decrypt key (optional, XOR)

Encoder and decoder must use the same key. Wrong key → garbled output.

Cover text

Secret message

Result (copy + paste anywhere)

This is a normal message.‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌

48 hidden zero-width chars73