RAR (Roshal Archive)
RAR is a proprietary archive format known for high compression ratios, solid archives, multi-volume splitting, and built-in error recovery. It is widely used for distributing large files and game mods, though its proprietary nature limits native OS support.
MIME Type
application/vnd.rar
Type
Binary
Compression
Lossless
Advantages
- + Higher compression ratios than ZIP, especially in solid mode
- + Built-in recovery records can repair damaged archives
- + Multi-volume splitting for size-limited media
- + AES-256 encryption with encrypted filenames
Disadvantages
- − Proprietary format requiring WinRAR or compatible tools to create
- − Not natively supported by operating systems — extraction tools needed
- − Slower compression speed compared to ZIP
When to Use .RAR
Use RAR when maximum compression and error recovery are priorities, or when distributing large files split across multiple volumes.
Technical Details
RAR5 uses a proprietary compression algorithm with optional solid mode (treating multiple files as one continuous stream for better ratios). Recovery records (Reed-Solomon codes) enable repair of damaged archives.
History
Eugene Roshal created RAR in 1993 in Russia. The format has evolved through RAR 1.x to RAR5, each improving compression and encryption. WinRAR remains the primary tool for creating RAR archives.