FamilyFinder (FamilyTreeDNA) and MyHeritage files supported.
Chromium based (e.g. Chrome or Opera) browsers are recommended, (Old) Microsoft Edge probably won't work, upgrade it to the Chromium based version.
The uploaded files will only be stored temporary and will be deleted after the session is closed.
Source code available
here.
Contact: staffan@betner.nu or @StaffanBetner (Twitter)