Help me find a Sepia photo filter please

[theblackradiator]

where have all the sepia photo effect filters gone? took a couple of photos of my ds today in a flat cap & waistcoat so wanted a sepia photo filter to give it that more vintage look. Why can't I find one ?? I'm sure it used to be a standard filter after b&w. I have found a retro photo app but it crops the photo to 1:1 and cannot be altered whereas I want my photo to remain it's original 3:4 portrait size.
Can anyone recommend an android app which just has a standard sepia filter please and let's me keep my photos original size.