I search about a good tool that help me to Vectorize my pixel photos to enhance the quality but be a free tool ?

I work as a graphic designer sometimes i see some photos with bad quality like a blurred pixels . so I search about a good tool that help me to Vectorize my pixel photos to enhance the quality but be a free tool ? 

Parents
  • Gimp is an okay free program as well!

Reply
  • Gimp is an okay free program as well!

Children
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