Change KakaoTalk themes without installing an app, the reason behind tesil
July 11, 2026
It was always frustrating to have to install an app, sign up, and go through complicated processes just to change a KakaoTalk theme. That’s why we created tesil, a tool to pick and assemble pieces in the browser and instantly receive them. This article is not about how to use it, but a record of why and how we made it.
It Started with a Small Inconvenience
Anyone who has ever changed a KakaoTalk theme knows. The process is somewhat cumbersome. You have to install a theme-making app, create an account, match image specifications, and the application method differs depending on whether you’re using an iPhone or Android. For people who just want to change the background and chat bubble color to their liking, the barrier is high.
Whenever we create a tool, we always ask the same question: Can this be done directly in the browser without installing an app or signing up? KakaoTalk themes were the perfect subject for that question. In fact, people are actively searching for this. We confirmed through data that searches like ‘how to make a KakaoTalk theme’ are consistent. The demand is clear, and if the process is unnecessarily complicated, we can simplify it.
Assemble and Receive
tesil has three principles. It can be done directly in the browser without installation or sign-up, you just need to select and combine design pieces like the background and chat bubble, and it exports in both iPhone and Android formats. Instead of a complicated editor, we focused on a simple flow of selecting, combining, and receiving, aiming to get results in just a few minutes.
What We Tried Not to Compromise On
There are two points where we did not want to compromise. One is copyright. Themes are ultimately about images and design, so using art with unclear sources could cause users trouble later. The design pieces of tesil are structured with respect to this aspect. The other is specification accuracy. KakaoTalk themes won’t apply or may look broken if the image size and format are incorrect. To ensure the result is applied properly without users worrying about the specifications, we let the tool handle that complexity.
We have explained why this format difference is important and how to actually apply your created theme in How to Make a KakaoTalk Theme, separated by iPhone and Android.
A Small Tool, But the Same Idea
tesil came from the same idea as other free tools we have made. It removes cumbersome processes and allows users to get results directly in the browser without installation or sign-up. Just like how photos and settings are processed only on the device, we think this approach works well for tasks that are desired to be like KakaoTalk themes but are tedious to go through. Free, no install / no download, and no sign-up—create it yourself at tesil.
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