Decoy Font(mixfont.com)
194 pointsby ray__Jul 16, 2026

32 Comments

ChrisArchitectJul 16, 2026
paularmstrongJul 16, 2026
Can someone explain the actual use-case here? I'm struggling with this because it also hides the message from myself, making it incredibly hard to type because I have no confirmation that I hit the right keys on the keyboard.
certifiedloudJul 16, 2026
Just squint and it'll become clear.
tomtheelderJul 16, 2026
Zoom out and you'll see the hidden message
samschoolerJul 16, 2026
I think this would be more interesting if the underlying letters were the fake letters as well. For usability it wouldn't be as good as you'd need an encoder, but it'd be cool because an AI with browser access couldn't read the contents either.
wronexJul 16, 2026
I was thinking this too. Then it might as well look like a normal font. But copy-paste and you get a garbled mess. Screen readers though.
9999pxJul 16, 2026
I screenshot the example and neither Claude nor ChatGPT had any problems reading both phrases. I don't get it.
alfanickJul 16, 2026
Someone had an idea, neat idea, but solved 10 years ago already.

Edit: GPT-5.5 says: "The hidden text is “HAPPY HUMAN.”

The outlined decoy text is “SORRY ROBOT.” Blurring or viewing it from farther away reveals the hidden message."

KarlissJul 16, 2026
1) Make an ambiguous text 2) Feed it to AI and see which of the 2 it picks 3) If it detects both repeat step 2 using minor adjustments or different AI model until AI responds with one of 2 message 4) Make a blog post claiming that AI chose dummy and other message was the real one
noman-landJul 16, 2026
This seems like it would absolutely wreck the experience for people using screen readers.
cushJul 16, 2026
It only works as a decoy when you give it to the LLM as an image. As html it appears like normal human friendly text, which is what screen readers use to interpret the text.
kube-systemJul 16, 2026
Which means that this font is entirely useless unless it is implemented in a way that breaks screen readers.
atarianJul 16, 2026
How? AFAIK screen readers don’t do OCR.
kpsJul 16, 2026
The assumption is that if you use this alone to try to convey information to a human, a human with a visual disability can't use it. If you also provide a text channel (e.g. `ALT="…"`) then the LLM can use that and doesn't need to read the confusing image.
OsrsNeedsf2PJul 16, 2026
Is it useful? No. Does it stop AI from reading it? Also no. But is it cool? Yes, it is very cool.
ryant123Jul 16, 2026
Yeah, it looks good
inigyouJul 16, 2026
The demonstration shows that it does stop AI
sheeptJul 16, 2026
It only works if you give it a screenshot, but it wouldn't work to block AI scrapers or fetch tools, and I think if printed out, it wouldn't work reliably if you took a photo, especially from afar
legoheadJul 16, 2026
I made an image and it fooled GPT. I asked it to look for a hidden message and it found the blurred word.

Still cool+fun though.

goodmythicalJul 16, 2026
The demonstration might, and it may work for certain models with certain prompts, but I just asked gemini if it could see both and it both did see both and gave me a tutorial on how I could see both as if it were a simple magic eye poster.
CshayaJul 16, 2026
sometimes in life there is no reason to kick a rock around besides having fun ;)
CGMthrowawayJul 16, 2026
> Is it useful? No

Seems like it might have some use thwarting Ring/Flock/etc cameras within a specific proximity.

It's giving major "They Live" vibes.

TiredOfLifeJul 16, 2026
Is it useful? No. Does it stop AI from reading it? Also no. But is it cool? Also no. Does it give me nausea? Yes yes yes.
jonplackettJul 16, 2026
I just gave the day dream / pay bills image to ChatGPT and Gemini pro and they both could only tell me the pay bills text (shown with the thin lines)
xnickbJul 16, 2026
Sure, but this is only as useful as useless it is.

Meaning the moment this gets wide adoption AI will have 0 issues dealing with it. LLMs are very good at translating one language to another.

goodmythicalJul 16, 2026
Gemini flash responds to "can you read both messages here?" with:

Yes, this is a clever optical illusion! Depending on which layers your eyes focus on, you can read two entirely different messages in this image:

    Message 1 (The sharp outline layer):

        PAY BILLS

        How to see it: Focus on the sharp, concentric black outline contours of the letters.

    Message 2 (The soft, blurry shadow layer):

        DAY DREAMS

        How to see it: Let your eyes relax/defocus slightly, or step back from the screen to focus on the soft, heavy grey drop shadows. The blurred shadows transform the "P" into a D, the "B" into a D, the "I" into an R, the "L"s into an M, and the "S" is shared!
jszymborskiJul 16, 2026
I think this illustrates that you can just do stuff without claiming it is useful. Like couldn't you just make this font and call it something like double-entendre or something?
BugsJustFindMeJul 16, 2026
You could, but is that what they've done?
jszymborskiJul 16, 2026
I'm just saying they should just drop the dubious claims and just say "I made a font that I think looks cool".
BugsJustFindMeJul 16, 2026
Oh, I fully agree
jereJul 16, 2026
It's similar to any anti face detection art. Probably useless but cool.
MorromistJul 16, 2026
Ehh. Probably not many people will be using this particular thing to thwart ai BUT I think it may be a stop on a path towards something very useful someday.
DweditJul 16, 2026
This is just level of detail. Gemma E4B reads the sharper text until you resize down to 150x150, then it reads the other text.
crazygringoJul 16, 2026
As do I. The hero image clearly says "SORRY ROBOT" to me, which is the message supposedly intended for AI... kind of a fail.

It's only when I squint hard that I can see "HAPPY HUMAN".

hananovaJul 16, 2026
You’re doing it the wrong way around, try intentionally letting your eyes defocus.
AlotOfReadingJul 16, 2026
Downsizing is effectively low pass filtering, so that's expected. Any scheme that transmits different messages in different frequency bands is going to be susceptible to a similar attack.
voidnullvalueJul 16, 2026
I generated a skill.md that reads this trivially. What kind of testing are you doing prior to release?

https://gist.github.com/voidnullvalue/620607d3c1773f8e7d83fb...

shlewisJul 16, 2026
Not even AI. I think I can write PIL script that will fix the font to be read by any ocr software.
mrweaselJul 16, 2026
Admittedly I'm a bit salty about LLMs due to they constant attacks on our infrastructure, the damage their doing to peoples minds and the general lack of morals shown by the AI companies, but things like this is rather childish and not really a solution to anything.
fckgwJul 16, 2026
Have you no whimsy?
theideaofcoffeeJul 16, 2026
NO FUN ALLOWED on srsbznz hacker news!
hyperhelloJul 16, 2026
How does it know HAPPY HUMAN translates to SORRY ROBOT? Is there a cycle in there or something?
pavonJul 16, 2026
I don't think the font can actually do that - I think it is a hand-crafted example of the idea. The later examples all have random letters for the decoy text.
MinimalActionJul 16, 2026
Extremely cool. I'm sure they'll eventually be trained to read it, but it's nice until then to trick AI.

I'm mad at AI companies for stealing texts from the entire internet knowledge base and now privatizing those profits in some sense.

meeritaJul 16, 2026
I am still figuring out what use case this might have. Why would you want to deceive an AI? Not to mention that, eventually, all AI systems will end up reading it.
jaakkocJul 16, 2026
Cool. Now do an accessible version.

(/s)

deadbabeJul 16, 2026
What would be cool would be neon signs using this font, where the front tubes show the decoy message, but then there’s hidden rear tubes that shine light on the wall in a different color showing the actual message.

Something like the DAY DREAM/PAY BILLS would be pretty artistic!

btbuildemJul 16, 2026
Very neat! I like how the decoy text is less visible to the human eye than the "hidden" message, but it's the other way for the image models. Well done!
gilesvangruisenJul 16, 2026
Sol (high)

"[screenshot] there's a hidden message in this text what is it"

"The hidden message is “HAPPY HUMAN.”

The visible outlines say “SORRY ROBOT,” but if you blur or squint at it, the shading underneath reads “HAPPY HUMAN.”"

make3Jul 16, 2026
wow that's kind of crazy impressive that it can do that honestly, VLMs have gone so far, can't imagine the crazy amount of annotations they had to create to get to that level
SvokaJul 16, 2026
So... CAPTCHA?
yrds96Jul 16, 2026
Which sufficient tooling calls even OCR can read this, but I think this can be improved
fussloJul 16, 2026
Maybe the more interesting thing is how far people are going to 'fight' against AI?

Just the fact that people are putting real thought and effort (even if it doesn't last too long...) is worth considering.

On the human side, I'm kinda losing patience proving I'm human. But, I also really like claude being able to access information.

klabb3Jul 16, 2026
> Maybe the more interesting thing is how far people are going to 'fight' against AI?

All ”AI resistance” I’ve seen is not against the tech, but against human bad actors behind AI: unethical procurement of training data, reckless application, low effort high volyme spam, replacing humans, centralization of power, dependency on megacorps etc. I think a lot of people have become less tech-positive after the ad-tech era that brought us social media, unprecedented levels of surveillance, freemium rug pulls etc. It’s much easier to understand the resistance if you place it in that context, rather than imagining millions of sleeper agent luddites suddenly coming out of the woodworks.

xg15Jul 16, 2026
I like how, if you hold the phone at a distance, but not as far as intended by the font, your brain sort of mixes letters from both messages.

I was at some point reading SAPPY ROMAN, HARPY ROBAN etc.

Also, viewing the "hidden message" works even better if you hold the screen at an angle, tilted away from you.

goodmythicalJul 16, 2026
Also works if you scale/zoom the image. The crisp lines disappear entirely at a certain point.
jotatoJul 16, 2026
Hermes using gpt-5.5

Prompt: What does the message in this image say? Look closely

Response: DAY DREAM. The outline says “PAY BILLS,” but the hidden darker text says “DAY DREAM.”

jjcmJul 16, 2026
It's been really interesting seeing how LLMs perceive things differently than humans. I'm working on image->html conversion pipelines right now, and there are glaring issues LLMs run into that are obvious for humans. Any subtle gradients get lost, 75 degree angles get converted to 90 degree angles, etc.

This tracks towards what you're seeing with this font - the high frequency details get picked up, but the low frequency ones dont.

josefritzishereJul 16, 2026
I am struggling to imagine a scenario where this would actually work as intended.
calebmJul 16, 2026
Super cool!
calebmJul 16, 2026
asahJul 16, 2026
waddaya know, it worked (on google Gemini/veo)

https://share.gemini.google/1yNVV19wUn46

BugsJustFindMeJul 16, 2026
Everyone trying so hard to do something "useful" that they don't recognize when all they've done is make art.

Had this been described as a font that contains two overlapping messages for fun effect, everyone would understand and love it.

Instead, we get this zero-introspection take: "Decoy font is...more difficult for AI to read. If you’re having a hard time seeing the hidden message..."

It's difficult to read period and has zero effect on current SOTA or future AI. But it does show two overlapping messages that can be read in different ways.

jambalaya8Jul 16, 2026
I see uses for it that have nothing to do with AI, and which are not at all art.
parpfishJul 16, 2026
"They Live" vibes
digitaltreesJul 16, 2026
Omg. I needed this in my life.
jryan49Jul 16, 2026
Squinting is surprisingly effective for me for seeing the hidden text. That's really cool!
MPSimmonsJul 16, 2026
Also goes the other way, where you use the decoy to give instructions to the AI...