Videos using yellow font are going viral on TikTok lately, and they've got some users confused.

The trend is known as "Yellow Font Theory," and it's been a growing meme since November 2025, but many of the videos fail to explain what exactly the yellow font means.

So, what is Yellow Font Theory, and why are people writing "yellow font btw" at the end of their captions? Here's what you need to know.

@yellowfont.halfspeed

♬ original sound – 🪽

What Does 'Yellow Font Theory' Mean?

Yellow Font Theory refers to the idea that people use yellow font in their short-form video captions to signify that they're sharing an emotionally vulnerable statement or opinion with the world.

Videos using yellow font over emotionally honest captions started becoming increasingly popularized on TikTok throughout late November 2025 as TikTokers like @ericcromartie started going viral by posting videos with long, honest captions in yellow font.

Then, later in November, other TikTokers caught onto this trend and started posting parodies and ironic memes based on this phenomenon.

These videos usually use yellow font over either corny emotional captions or ironically emotional captions and explicitly draw attention to the font color by writing, "Yellow font btw" at the end of the statement.

This trend was largely popularized by TikToker @yellowfont.halfspeed, who started posting videos that poked fun at the idea of using yellow font in emotional videos back on November 23rd.

@elizabrrrrt yellow font btw am I a niche influencer now #fyp #charliekirk #yellowfont #niche #thirstrap ♬ original sound – thealienarms

How Is 'Yellow Font Theory' Used In Memes?

As a meme, Yellow Font Theory is mostly used in an ironic capacity. Some of the most popular examples of the meme feature yellow-font captions that are either emotional or ironically emotional, ending with the phrase, "Yellow font btw" or simply "yellow font."

The point of the memes is to explicitly make it clear that yellow font is being used to convey an honest, emotional sentiment, whether that sentiment is honest and emotional or not.

Beyond the memes, some people are taking the trend seriously and attaching the same "yellow font btw" phrase to genuinely emotional captions.

This has made it increasingly hard to tell which videos are genuine and which are not, resulting in a lot of videos by people wondering what the Yellow Font Theory means.

@yellowfont.halfspeed

♬ original sound – b

What Are Some More 'Yellow Font Theory' Memes?

@grxce.isa Literally bro #lore #btw #yellowfont #joke #attempt ♬ dream – ✧

@eternaliliesx take the risk or lose the chance #foryoupage #taylorswift #yellowfont #ruinthefriendship #targetaudience ♬ original sound – mads

@sp555dder #real #wockst★rz #yellowfont #viral #cool ♬ original sound – ً

@yellowfont.halfspeed

♬ original sound – vevuedits

---

For the full history of Yellow Font Theory, be sure to check out Know Your Meme's encyclopedia entry for more information.