How to tell a girl that you think she's pretty, without sounding creepy about it?

snowboarder720
quick question for all of you. If a random guy just walked up to you and just said "you look cute today", would you think he's a creep?

if so, what are other lines for a guy to just tell a girl that he thinks she's pretty without sounding creepy.

for example, if your busy working and some random guy who thinks your cute just said hello and initiated a small conversation and then before he leaves he just states that he thinks your cute. would you feel shy?
How to tell a girl that you think she's pretty, without sounding creepy about it?
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