Magika is a novel AI-powered file type detection tool that relies on the recent
advance of deep learning to provide accurate detection. Under the hood, Magika
employs a custom, highly optimized model that only weighs about a few MBs, and
enables precise file identification within milliseconds, even when running on a
single CPU. Magika has been trained and evaluated on a dataset of ~100M samples
across 200+ content types (covering both binary and textual file formats), and
it achieves an average ~99% accuracy on our test set.

Magika is used at scale to help improve Google users' safety by routing Gmail,
Drive, and Safe Browsing files to the proper security and content policy
scanners, processing hundreds billions samples on a weekly basis.