How to get the Slim Filter on TikTok and do the 'lost 100lbs' trend
Rachel Newton
Updated on March 24, 2026
Another effect has gone viral on TikTok called the Slim Filter which makes it look like you’ve ‘lost 100lbs’ in weight.
Social media filters that dramatically change your appearance are taking over TikTok this month and amusing everyone.
The first one was the hilarious Old Age Filter which showed what you’d look like as a pensioner – and it’s scarily realistic!
Then, the Gender Swap Filter began entertaining people, and the Long Hair Filter. Now, there’s a new one to add to the mix.
Here’s how to get the Slim Filter, also known as the Weight Loss Filter…
TikTok’s Slim Filter looks like you’ve ‘lost 100lbs’
The filter is being used as part of a trend that sees TikTok users fooling others into thinking they’ve lost loads of weight.
However, the popular effect doesn’t actually make your face smaller, it makes it bigger, so the whole thing is a prank.
People are placing the filtered image next to the normal one and pretending to see what they’d look like if they lost 100 pounds.
It’s gone viral across the world, but many are slamming the trend for being ‘toxic’ and promoting issues surrounding body image.
How to get the Slim Filter on TikTok
The filter everyone is using isn’t actually on TikTok, it’s on an app called FaceApp where you can change your appearance in all kinds of ways.
Download FaceApp for free on the App Store. It will ask you to start a free trial but you can just tap the cross at the top if you don’t want to do that.
Then, follow these steps:
- Upload a photo of yourself.
- Tap ‘Sizes’ in the bottom bar.
- Press ‘Big Face’.
- Tap ‘Apply’.
- Now press ‘Save’ at the top.
How to do the ‘lost 100lbs’ trend
To make the videos everyone is doing on TikTok where it looks like you’ve ‘lost 100lbs’ you need to download another free app called CapCut and create an account.
Here’s what to do after that:
- Open TikTok and type ‘Slim Filter’ or ‘Weight Loss Filter’ into the search bar.
- Find a video of someone that has done the trend.
- Above their username, it will say ‘CapCut – Try this template’.
- Click on that and you will be redirected to CapCut.
- Follow the steps to create the clip, then download it.
- Now you can upload the video to TikTok.
