Formal:
* 很高兴见到你 (Hěn gāoxìng jiàn dào nǐ): Literally "very happy to see you." This is the most common and polite way to express this sentiment.
* 很高兴认识你 (Hěn gāoxìng rènshi nǐ): Literally "very happy to know you." This is used when meeting someone for the first time.
Informal:
* 见到你真高兴 (Jiàn dào nǐ zhēn gāoxìng): Literally "Really happy to see you." This is a more casual way to express the same sentiment.
* 看到你真高兴 (Kàn dào nǐ zhēn gāoxìng): Literally "Really happy to see you." This is similar to the previous phrase but more casual.
Other options:
* 很高兴 (Hěn gāoxìng): "Very happy." This is a shorter and more informal way to say "glad to see you."
* 很开心 (Hěn kāixīn): "Very happy." This is also a shorter and more informal way to say "glad to see you."
In addition to the above, you can also use phrases like:
* 好久不见 (Hǎojiǔ bùjiàn): "Long time no see."
* 你最近怎么样 (Nǐ zuìjìn zěnmeyàng): "How are you doing lately?"
The best way to choose the right phrase depends on the specific situation and your relationship with the person you are talking to.