There are a ton of these now. Google provides OCR as part of their machine vision API. AWS has similar with Rekognition. As others have mentioned, there are dozens of others on less well known platforms.
Actually, based on my tests, there are only a few good services:
Abbyy (best recognition rate but by far most expensive), Google Cloud Vision (second best recognition rate), Microsoft OCR and... our OCR.space service with a very generous free tier and a competitive priced PRO tier.
Abbyy (best recognition rate but by far most expensive), Google Cloud Vision (second best recognition rate), Microsoft OCR and... our OCR.space service with a very generous free tier and a competitive priced PRO tier.