A free program for Android, by Stofkat.

ToffeeShare is an end-to-end encrypted file-sharing platform that lets you send files directly from your mobile phone to another device. 

The transfer speeds are extremely fast. ToffeeShare is designed to be completely decentralized, so the data never leaves your device.

The app can be used to share files between two devices or between a device and a web browser.

The mobile app can be used in conjunction with the web app, so the receiving party does not have to install anything.

You can download this tool from the Google Play Store.