In Japan we use the word “完全(かんぜん-kanzen)” for the English word “Perfect”. You can use the left side Japanese Kanji “完全” image for your any project freely.
And we also have a similar word “完全無欠(かんぜんむけつ-kanzenmuketsu)”. The meaning of this word is “perfect without any lack”. You can use this image ,too.