Smuggling arbitrary data through an emoji 😀󠄵󠅢󠅢󠅕󠅥󠅢󠄣󠄢
💀󠅀󠅟󠅧󠅞󠅕󠅔󠄐󠅒󠅩󠄐󠄵󠅢󠅢󠅕󠅥󠅢󠄣󠄢
This Hacker News comment by GuB-42 intrigued me :
With ZWJ (Zero Width Joiner) sequences you could in theory encode an unlimited amount of data in a single emoji.Is it really possible to encode arbitrary data in a single emoji?
tl;dr: yes, although I found an approach without ZWJ. In fact, you can encode data in any unicode character. This sentence has a hidden message󠅟󠅘󠄐󠅝󠅩󠄜󠄐󠅩󠅟󠅥󠄐󠅖󠅟󠅥󠅞󠅔󠄐󠅤󠅘󠅕󠄐󠅘󠅙󠅔󠅔󠅕󠅞󠄐󠅝󠅕󠅣󠅣󠅑󠅗󠅕󠄐󠅙󠅞󠄐󠅤󠅘󠅕󠄐󠅤󠅕󠅨󠅤󠄑.
https://paulbutler.org/2025/smuggling-arbitrary-data-through-an-emoji/
(Try pasting it into this decoder)
https://emoji.paulbutler.org/?mode=decode
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Animating URLs with Javascript and Emojis
by Matthew Rayfield on January 17th 2019
You can use emoji (and other graphical unicode characters) in URLs. And wow is it great. But no one seems to do it. Why? Perhaps emoji are too exotic for normie web platforms to handle? Or maybe they are avoided for fear of angering the SEO gods?
Whatever the reason, the overlapping portion on the Venn diagram of "It's Possible v.s. No One Is Doing It" is where my excitement usually lies. So I decided to put a little time into the possibilities of graphical characters in URLs. Specifically, with the possibility for animating these characters by way of some Javascript.