Optional encryption using AES (Advanced Encryption Standard) with a 256-bit key.

Optional 256-bit BLAKE2 file hash can replace default 32-bit CRC32 file checksum.

Compression dictionary from 1 MiB to 1 GiB (limited to 256 MiB on 32-bit Windows, however 32-bit Windows still can decompress archives with 1 GiB dictionary).

Support for maximum file size of 16 EiB (2 64 bytes) minus 1.

Multithreaded CPU compression and decompression.

Checksum (integrity) verification for ACE, ARJ, BZIP2, CAB, GZ, BZIP2, RAR, XZ, ZIP and 7z archives.

Packing (creation) of RAR or ZIP archives.

RAR5 also changed the file name for split volumes from 'archivename.rNN' to ''.

The RAR5 file format removed comments for each file (though archive comment still remains), authenticity verification, and specialized compression algorithms for text and multimedia files. Options added in v5 include 256-bit BLAKE2 file-hashing algorithm instead of default 32-bit CRC32, duplicate file detection, NTFS hard and symbolic links, and Quick Open record to allow large archives to be opened faster. Maximum path length for files in RAR and ZIP archives is increased to 2048 characters. AES encryption, when used, was increased from 128- to 256-bit.

The RAR5 file format increased the maximum dictionary size to 1 GiB 11 different compression directory sizes from 1 MiB to 1 GiB are available, with the default in version 5 increased from 4 MiB to 32 MiB, typically improving compression ratio. WinRAR versions before 5.0 do not support RAR5 archives. Support for the archive format RAR5, using the same RAR file extension as earlier versions, was added in v5 files in the older RAR file format are now referred to as RAR4. WinRAR and the RAR file format have evolved over time.

Ms dos source code rar