What is the maximum file size I can upload? Einar Austlid April 27, 2021 08:15 Updated Follow The maximum size of any file uploaded to Fonn is set at 1GB. Related articles Which file extensions does Fonn accept? What are the different types of folders? Can I upload video files? Everything you need to know about: Fillable PDF's How can I edit where Fonn saves downloaded documents? Comments 0 comments Please sign in to leave a comment.