Hinkel, who won 21 caps between 2003 and 2009, played for Freiburg last season having previously spent three seasons at
The full-back, having started his professional career with Stuttgart, also spent two years with Sevilla in
Hinkel announced his decision to hang up his boots on his blog while also confirming his intention to stay in football in some capacity in the future.
He said: "There's something important I need to tell you. I decided to end my career as a football pro. It was not a snap decision, but a step that has been planned for some time. I've even been busy with my new career for a few weeks already.
"I know many may think that 30 is no age to quit. But in my case I have a different opinion. I played football at a very high level for 12 years - 12 wonderful intensive years with amazing experiences, first class clubs and overwhelming supporters.
"Of course, I had opportunities to carry on. There were a lot of offers in recent months, especially from abroad. But together with my family I decided that this would not have been the right thing for us anymore. I have two kids - and no desire to sign a contract somewhere just to prolong my career for a little while. That's not my way."
Regarding his future plans, Hinkel added: "I am thrilled to begin a new chapter in my life and full of energy to start it. It goes without saying that this chapter will also be in football, this is the best sport in the world.
"I have several ideas, but before I can start to implement them, I want to improve my skills and knowledge in all respective areas. Right now I'm working to get a coaching licence."
Borussia Dortmund defender Mats Hummels insists the UEFA Champions League final will not be his last game for the club.