What is a .SIT file?
SIT is a StuffIt archive, the dominant compression format on the classic Mac.
- Did you know
- StuffIt was to the classic Mac what ZIP was to Windows.
- StuffIt was written in 1987 by Raymond Lau, then a high-school student, and later sold by Aladdin Systems.
- Unlike ZIP, StuffIt preserved a Mac file’s resource fork, which was essential to classic Macintosh documents and applications.
- What Analyser reads
- Open more archives, packages and installers: macOS XAR/.pkg/.mpkg installers (member list), Windows .msu updates (CAB), Snap SquashFS packages, Flatpak bundles, StuffIt (.sit/.sitx), lzop (.lzo) and Brotli (.br) streams, Java Web Start (.jnlp), and the .tlz/.tbz/.tz compressed-tarball shorthands.
- Depth of analysis
- .SIT is an identification-grade format: Analyser recognises it from its bytes and decodes the header metadata it carries, rather than opening it in a full viewer. Formats that do get a full viewer are marked "Full" on the formats page.
- Open a .SIT file
- Drag a .SIT file onto the Analyser home page (or tap to pick one). It is identified entirely in your browser - nothing is uploaded, there is no account, and it works offline once installed.