Wishing the happiest of birthdays to my best friend who keeps giving, even when [he/she] knows that I don't have much to give in return.

Happy birthday to someone who helps make my life truly amazing.

Here's to another year of celebrating our amazing friendship. I treasure all of the memories that we have together and look forward to new ones. Happy Birthday to my best friend in the world.

You are much more than a friend to me, you are like the [brother/sister] that I never had. Happy birthday my [brother/sister].

Birthdays come around every year, but a friend like you only comes along once in a lifetime. I'm so glad that we've become best friends. Happy birthday.

There's no greater friendship than the one I have with you. Wishing my best friend the best birthday ever.

Having you as my best friend is the best thing that has ever happened to me. You're the best. Happy birthday.

I want you to know that you mean so much to me and I cherish the friendship that we share with each other. Wishing a truly awesome birthday to my greatest friend.

A friend like you only comes along once in a lifetime. Happy birthday to my best friend.

Happy birthday to my favorite person in the whole world and my best friend.

People who have a best friend are blessed, but I am extremely best, because I have the greatest best friend ever! Wishing you all of the wonderful things that birthdays brings to my best friend.

Even when we're far apart, our friendship only gets stronger. Happy birthday my friend.

As your best friend, it's my job to make sure that this is the best birthday you've ever had. I hope you're looking forward to a day of grand festivities.

You deserve the best that life has to offer. Thanks for being such an amazing friend. Wishing you the greatest of birthdays.

Today is a great day because I get to celebrate another year with my best friend. Wishing the most amazing day to my best friend on [his/her] birthday.

I hope your birthday brings you as much joy and happiness as you have brought to me.

Many people come and go in life, but you came into my life and never left. Wishing a very happy birthday to my lifelong best friend.