CAB to 7Z Converter
Processing entirely on your device — large files may take a moment.
7Z is ideal for big archives you store or share with power users; convert to ZIP when the recipient just needs to double-click. If your files are still in CAB format, this page is the shortcut: CAB is Microsoft's installer cabinet format — drivers, Windows updates and legacy installers arrive as CAB files.
iLoveConverter processes everything locally on your computer, which makes it private and fast: no upload wait, no server storage, no limits. Add as many files as you like — batch conversion is built in.
How CAB compares to 7Z
| CAB | 7Z | |
|---|---|---|
| Compression | MSZIP / LZX | LZMA / LZMA2 |
| Encryption | None | AES-256 native |
| Bundling | Multi-file with folders | Multi-file, solid mode |
| Best for | Drivers and Windows updates | Maximum compression, secure archives |
How to convert CAB to 7Z
- 1
Select your files
Drag & drop your CAB files onto the area above, or click to browse. You can add multiple files at once for batch conversion.
- 2
Convert instantly
Click "Convert to 7Z". The conversion runs entirely inside your browser using WebAssembly — no upload, no queue, no waiting.
- 3
Download results
Download each converted 7Z file individually, or grab everything at once as a ZIP archive.
About the CAB format
CAB (Cabinet) is Microsoft's own archive format, built for software distribution: Windows update packages, device drivers and legacy installers arrive as CAB files. It supports MSZIP, Quantum and LZX compression, and Windows Explorer actually opens it — on Windows.
Everywhere else it is a locked box. Converting CAB to ZIP makes driver payloads and update contents readable on macOS, Linux and phones — useful when you need a driver file on a machine that cannot run the installer.
+ Strengths
- ✓Native to Windows software distribution
- ✓Efficient LZX compression for its era
! Limitations
- −Windows-centric — opaque elsewhere
- −No encryption or recovery features
About the 7Z format
7Z is the native format of Igor Pavlov's 7-Zip (1999), built around LZMA/LZMA2 compression — for years the ratio king against ZIP and RAR — with AES-256 encryption, solid archiving (similar files compress as one stream) and open, unpatented specifications. A 7Z of the same photos or code is routinely 20–40% smaller than its ZIP.
The trade-off is platform defaults: Windows Explorer and macOS Archive Utility do not open 7Z without third-party tools (7-Zip, PeaZip, Keka). It is the format for maximizing compression on your own terms, and for encrypted archives done properly (header encryption included).
+ Strengths
- ✓Top-tier compression ratio (LZMA2)
- ✓Real AES-256 encryption, optional header encryption
- ✓Open format, free tooling everywhere
! Limitations
- −No native OS support — recipients need tools
- −Solid mode makes single-file extraction costly
Why convert CAB to 7Z?
Think of it as moving your file to the container that fits the job. Windows-centric — opaque elsewhere 7Z works differently: Top-tier compression ratio (LZMA2) If any of that sounds like your task, run the conversion — it takes seconds and nothing leaves your device.
Frequently asked questions
Is this CAB to 7Z converter really free?
Yes — completely free, with no sign-up, no watermark and no daily conversion limits. The site is supported by advertising.
Are my files uploaded to a server?
No. The conversion runs entirely inside your browser using WebAssembly, so your files never leave your device — that is what makes it instant and private.
Does it work on Windows, Mac, iPhone and Android?
Yes. Anything with a modern browser works: Windows, macOS, Linux, Android and iOS. No software installation is required.
Is there a file size limit for CAB to 7Z?
The only limit is your device's memory, since nothing is uploaded. Files up to a few hundred megabytes work fine on a modern desktop browser; very large files simply take a little longer.
What about folders and directory structure?
The full directory tree is preserved: folders stay folders, and deep paths arrive exactly as they were packed in the CAB file.
Is there a size limit for archive conversion?
There is no upload cap because nothing is uploaded — the practical limit is your device memory. A few hundred megabytes of unpacked content works comfortably on a modern computer.