How to open a .SIT file online
No extra software to download or install.
Pick your .SIT file
Drag it in or click to choose it. We read its contents list first, so it opens right away without unpacking everything.
Browse what's inside
See every file with its size, how much it's compressed and its date, and search by name across all the folders.
Preview or download
Click a file to preview text or images, or save just that one. Need everything? Download it all as a single ZIP.
About .SIT files
What a .SIT file is, and what's inside it.
A SIT file is a StuffIt archive, the Mac equivalent of ZIP, used from the late 1980s into the 2000s for distributing Mac software. To open one on a Mac, use the free StuffIt Expander or The Unarchiver. On Windows, use StuffIt Expander for Windows or the unar command-line tool. StuffIt development ended in December 2019, so use ZIP for any new archives.
Programs that open .SIT files
| Full name | StuffIt Archive |
|---|---|
| Developer | Aladdin Systems / Allume Systems / Smith Micro Software |
| First released | 1987 (StuffIt, classic Mac OS) |
| Category | Archives |
| MIME type | application/x-stuffit |
| Signature | 53 49 54 21 "SIT!" at offset 0 (older classic StuffIt archives) |
Related viewers
Found something inside the archive? Open it here.
Do I have to unpack the whole .SIT file?
No. The viewer reads its table of contents first and only unpacks a file when you click it. That works even with multi-gigabyte archives, because we read just the bytes we need.
Can I open password-protected archives?
Yes, for ZIP (ZipCrypto and AES) and 7Z. You'll be asked for the password,. We can't recover forgotten passwords.
Is my .SIT file uploaded anywhere?
No. The code that unpacks the file is downloaded once and then reused.
Why does a .docx or .apk open as an archive?
Because they are ZIP archives under the hood. Office documents, Android apps, Java programs and EPUB books all use ZIP as their container.
What about split archives (.001, .z01, .part1.rar)?
Multi-part archives need all their parts. Today you can open the first part to see the file list; joining parts is on our roadmap.
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