The subject for the bachelor thesis is functions on public library websites in Sweden. The purpose is therefore to compare the functions of five Swedish public library websites with the goal of finding similarities, differences and possible patterns. The reason behind this is a lack of studies on public library websites internationally, as well as studies on library websites at a national level. The examined websites belong to Stockholm stadsbibliotek, Göteborg stadsbibliotek, Malmö stadsbibliotek, Uppsala stadsbibliotek and Umeå stadsbibliotek. The method used was a comparative content analysis. An observation schedule based on Mierzecka and Suminas’ model was also created for the material collection process and organization. Rogers and Scaifes’ external cognition theory was used as teorethical perspective. The findings show that there are similarities between the examined websites, which could be explained by their shared library type. There were also differences, that could be attributed to the fact that they have different levels of independence from the respective municipality's website. Lastly, there were patterns between the websites as well, that could be explained by their shared goal of meeting the users’ needs. But this is a limited study conducted on a small sample within a limited time frame. More research is therefore needed on this subject.