The State Archives in Leszno | Archiwum Państwowe W Lesznie in Poland has free, online genealogy collections as well as onsite family history collections. This is a newer archive, opened in the early 1950s.
You can see all online collections from the State Archives in Leszno by searching at Szukajwarchiwach.pl and filtering results by these archives. Here’s a link to the search results with thousands of digitized collections.
You can copy and paste text into Google Translate if you can’t read the original language.
Here’s a table from their site showing some digitized collections with links.
You can use SEZAM to search for collections at the archive. Here is an example of a search for collections at The State Archives in Leszno.
And here is a link to “Become a family archivist!” organized by the Supreme Directorate of State Archives.
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Friday: 7:00 am – 3:00 pm