An electronic device with a camera uses UV light to sanitize objects such as surfaces or hands. An object is identified by the electronic and placed at an optimal distance from the electronic device. At least part of the object is exposed to UV light emitted from the electronic device for a sufficient duration to achieve disinfection. In some implementations, instructions are delivered to a user associated with the electronic device to position the object so that a remainder of the object is exposed to UV light for disinfection. The electronic device may be moved relative to the object to continue disinfection. In some implementations, an indication is provided of the status of disinfecting the object.