Is there a maximum size for one/several document(s) that I want to have signed? You can create a collection of signatures with a maximum of 10MB. A collection can comprise of one or several documents. Related articles Are documents to be timestamped limited to a certain number of pages or a maximum file size? Is it possible to sign on multiple pages of the same document ? Universign API Guide Universign's identity validation principles Why and how can I revoke my certificate?