Signature information cannot be entered directly on the mobile phone! Need to use some software.

At present, some commonly used methods may be to sign on paper, take photos with mobile phones, cut out the signed pictures, and then paste them into electronic documents. However, this method is suitable for friends to show and has no legal effect, so it is not applicable to contracts, certificates and other documents.

Electronic document signing software, which can be a third-party software with electronic signature qualification, encrypts the electronic document by uploading, then manually signs it, and binds it with the electronic document itself to encrypt and save it again. Such documents cannot be tampered with and can be used for judicial expertise and disputed evidence.