How to open a .OSK file online
No extra software to download or install.
Pick your .OSK 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 .OSK files
What a .OSK file is, and what's inside it.
An OSK file is a game file used by the rhythm game osu! and developed by peppy. It functions as an archive that contains custom skin elements to change the visual appearance of the game's interface. These files are primarily opened and processed by the osu! application.
Programs that open .OSK files
| Full name | osu! Skin Package |
|---|---|
| Developer | peppy (Dean Herbert); osu! game |
| First released | 2007 (osu! first released September 2007) |
| Category | Archives |
| MIME type | application/zip |
| Signature | 50 4B 03 04 "PK" - standard ZIP local file header |
Related viewers
Found something inside the archive? Open it here.
Do I have to unpack the whole .OSK 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 .OSK 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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