To retain all branches you can try the svn2git tool. However, this tool has some bugs.
To only import the trunk (with complete history): git svn clone http://host/svn/...
Create a .gitignore after the conversion.
Turn the folder into a git repository as described here.

Do you need DevOps-experts?

Your development team has a full backlog? No time for infrastructure architecture? Our DevOps team is ready to support you!

Convert a Subversion repository to Git