Volim te jako.
Here's a breakdown of the sentence:
* Volim - I love (verb, present tense)
* te - you (object pronoun)
* jako - very much (adverb)
You can also use other translations like:
* Jako te volim. (Very much I love you.)
* Volim te puno. (I love you a lot.)
* Iskreno te volim. (I truly love you.)
The choice depends on the context and the desired level of formality.