Short answer: "I love you" in Portuguese is Eu te amo, or Amo-te depending on the situation.
Eu te amo, the core translation
The default way to say "I love you" in Portuguese is Eu te amo. Pronounced roughly eh-oo chee AH-moo.
When Portuguese speakers actually use it
"Eu te amo" in Brazil; "Amo-te" in Portugal.
Alternative: Amo-te
Amo-te is the other option Portuguese speakers reach for in this situation. It's not a synonym so much as a register shift, use the one that matches who you're talking to.
Practice this in a real Portuguese conversation
Reading a phrase and saying it out loud are two different skills. Skala's AI conversations let you drop "Eu te amo" into a real Portuguese exchange in your first 3-minute lesson, so it sticks the first time.
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FAQ
What's the most polite way to say "I love you" in Portuguese?
Both Eu te amo and Amo-te are polite. Pick based on who you're talking to: register, not translation, is what natives are tuning into.
How do I pronounce Eu te amo?
Roughly eh-oo chee AH-moo. Recording yourself once and comparing to a native audio inside Skala closes the gap faster than reading pronunciation guides.