How to resize a font? (Android)

[IIN]

I want to replace my phone's system typeface with adobe's Source Sans Pro, but it's too small for my eyes. How can I resize it? Thanks in advance?

[Ralf Herrmann]

Which phone?

[IIN]

I'm using an Android phone. I rooted it and I've been replacing the system fonts with fonts I like. I really like source sans pro, but it's just too small.

[Ralf Herrmann]

(Can’t help in that case, but added it to the topic title for clarity.)

[IIN]

Is it easy to resize ttf files? Source Sans Pro is an open source typeface. All I need is some method to make it bigger, and then I can put it on my phone.

[Ralf Herrmann]

Well, any font editor can do it, but fiddling with all the values is tricky. 

I would suggest to try the Fontsquirrel webfont generator:
https://www.fontsquirrel.com/tools/webfont-generator

You can upload a TTF font there, change the percentage of “x-height matching” and download the result. That’s pretty easy.