Reuters reported that the Cupertino-based tech giant was also setting up a group that would train police as to what kinds of data could be obtained and what was off-limits.
The news agency said the information had been in a letter, dated 4 September, sent by Apple general counsel Kate Adams to Democrat Senator Sheldon Whitehouse of Rhode Island.
In 2016, Apple refused to yield to an FBI demand to create a version of its iOS operating system that could be loaded on an iPhone 5C belonging to a terrorist involved in an attack in San Bernardino, California, in December 2015.
Since then, politicians from a number of countries, including Australia, have called for a means of breaking encryption in order to hunt down criminals. Australia is in the process of bedding down a law to make it an offence for technology companies to refuse to provide a means for law enforcement to access mobile devices.
In the letter, Adams wrote that Apple had dealt with 14,000 requests from law enforcement in 2017, including 231 emergency requests to each of which it responded within 20 minutes.
While such requests were handled via email, once the online tool was created by end-2018, it would be used instead to make and track requests.
As to the training of police officers, the letter said 1000 had already been trained in person at Apple's headquarters, but once the online tool was ready, the training would be done online.