Is there a tool to lower number of triangles in model's mesh?

Questions & Answers
1

I don’t have experience with 3D modelling at all.
I have a model in Collada format with thousands of triangles. I want to use a mesh collider on it but it supports only max 255 triangles.

Is there a software that can create another mesh with low number of triangles?

2

@nTu4Ka
actually yeah, it’s based on a Website i use for my game. the website is Called Mixamo.

here is the link you can try it: https://www.mixamo.com/decimator

NOTE ** you may have to make an account, but it’s free.