KARLIE.AIAI TOOL · WEB APP● IN USE

A thumbnail for every live stream, in the channel's own style

Lock a face and a few style samples once. Then type a headline and a scene, and Gemini makes a 16:9 thumbnail that fits the rest of the channel.

My brother Karlie streams Valorant in Malayalam almost every day. Every live needs a thumbnail, and making one by hand each time took too long. I built KARLIE.AI in Google AI Studio on the Gemini API, and every thumbnail on his channel since November 2025 comes from it.

IN NUMBERS● IN USE

112live streams with a thumbnail from it

1face photo, locked once

7looks to pick from, like Gaming or Cinematic

2K16:9 image from one prompt

ROLE: Designer and builder (personal project)
TIMELINE: Nov 2025, in use since
PLATFORM: Web app, built in Google AI Studio
TOOLS: Gemini API, React, TypeScript
CHANNEL: KARLIE on YouTube See the lives ↗
CODE: Public version GitHub ↗

PROBLEM

A new thumbnail, almost every day

A live stream with a plain thumbnail gets passed over. But making a good one by hand, every day, takes longer than it should. General AI image tools are fast, yet they change the face and lose the channel's look from one image to the next.

EVERY DAYA new stream most days, so the thumbnail has to be quick.

SAME FACEIt has to look like Karlie every time, not someone close.

SAME LOOKColors, bold text and layout that match the rest of the channel.

HOW IT WORKS

Set it up once, then just describe the stream

Face: upload or paste one clear, front-facing photo.
Style: add a few past thumbnails, so it learns the colors, type and layout.
Lock: the profile is saved in the browser, with no account.
Generate: type a headline and a scene, pick a look and a mood, and get a 16:9 thumbnail.

KARLIE.AI setup: face and style references — 01 · Setup: one face photo and a few style samples, then lock the identity.

KARLIE.AI generating a thumbnail — 02 · Headline, scene, look and mood. Then it generates.

KARLIE.AI match history — 03 · Every result is kept in a history, ready to download.

NOTE · These screens use well-known faces as test stand-ins. On the channel, it uses Karlie's own photo.

A STRICT FACE RULEThe prompt asks for an exact match to the face photo, unless the chosen look is a cartoon or stylized one.

STYLE FROM EXAMPLESPast thumbnails show the style better than a long written prompt, so they go in as images.

ONE PROMPT, ONE IMAGEFace, style samples, headline and scene go to Gemini together, and it returns a 2K 16:9 image.

YOUR OWN KEYThe public version asks for your own Gemini API key, so anyone can use it for their channel.

ON THE CHANNEL

Every live since November

Every live after "Skibidi Valo and Fun Custom" has a thumbnail made with KARLIE.AI. A few of them below: Valorant, Christmas and New Year lives, and other games.

WHAT I LEARNED

What made it work

SHOW, DON'T DESCRIBEA few example images kept the style steadier than any style prompt I wrote.

SMALL INPUTSA headline and one line of scene is enough. Fewer choices made it fast to use every day.