"My body just got reunited with my soul and mind, the parts of me that matter and that never can be held hostage," Peter Sunde wrote on Twitter on Monday.
He also thanked his supporters for backing him during his time in jail.
Sunde's lawyer Peter Althin confirmed his client's release after serving two-thirds of an eight-month sentence imposed on appeal in 2010.
Founded in 2003, The Pirate Bay allows users to dodge copyright fees and share music, film and other files using bit torrent technology, or peer-to-peer links offered on the site.
Sunde, 36, had been living under a false identity in southern Sweden when police finally caught up with him in May after a two-year hunt.
He and the site's other founders Fredrik Neij and Gottfrid Svartholm Warg had been sentenced on appeal to various prison terms and order to pay a fine of 46 million kronor (five million euros, $6.9 million) for copyright infringement.
Site financier Carl Lundström was also sentenced to four months in prison.
My body just got re-united with my soul and mind, the parts of me that matters and that never can be held hostage. #freebrokep #brokepfree
— Peter Sunde (@brokep) November 10, 2014
Neij, the last original founder of the site at large, was arrested last Monday on Thailand's border with Laos.
His capture came just days after Warg was sentenced by a Danish court to three years and six months in jail for "hacking and aggravated vandalism" in the largest such case in the country's history.
The judicial action against The Pirate Bay has dealt a symbolic blow to a global community of online sharers of films and music, which the movie and music industry decries as systemic theft that costs billions in lost revenue
each year.
So many people saying such nice things, thanks to all of you! And thanks for the support during this period. It really means a lot!
— Peter Sunde (@brokep) November 10, 2014
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