CONVERT
CAB → ZIP
Tap to choose your fileDRAG. DROP. DONE.
Upload any file and our engines will handle format detection automatically.
Max 25 MB · Free plan · No signup required
Convert to:
Detecting available formats...
Optimize for
Leave empty to use original name. Extension added automatically.
Uploading...
Processing your file...
Fast, secure CAB to ZIP conversion. No registration required.
Why this pair exists — CAB is Microsoft's Cabinet archive format used in Windows installer packaging. Ergo, the ZIP route. Converting CAB to ZIP means repacking the files inside one archive container into another format without extracting them to disk first. KaijuConverter runs 7-Zip and libarchive server-side, so a CAB full of thousands of entries becomes a clean ZIP with the same tree, timestamps and permissions preserved. Worth knowing: CAB is Microsoft's Cabinet archive format used in Windows installer packaging. Meanwhile ZIP is the universal archive format, supported natively on Windows, macOS, Linux and mobile.
Windows Cabinet
Source formatCAB (Cabinet) is a Windows archive format used for software installers.
ZIP Archive
Target formatZIP is the most widely used archive format, supported natively by Windows, macOS, and Linux. It combines file compression and bundling, making it the default choice for sharing multiple files as a single download.
Why convert CAB to ZIP
ZIP is supported by more systems out of the box than CAB. Windows reads ZIP without extra software; macOS and most Linux distros ship decoders too. Converting upstream saves every downstream user from installing a utility just to read your bundle.
HOW TO CONVERT
CAB → ZIP
Upload the CAB
Send the archive file to KaijuConverter. Entries are never written to disk in cleartext.
Repack through 7-Zip
Our pipeline opens the CAB in streaming mode, walks every entry and writes it into a fresh ZIP container.
Download the ZIP
The new archive is ready in seconds. Both files auto-delete within two hours.
Common Use Cases
Share across platforms
Send ZIP files to anyone without worrying about whether they have the right software for CAB.
Embed in documents
Drop ZIP output into Word, Google Docs, PowerPoint, Notion or a website without conversion warnings.
Optimize size
ZIP often produces smaller files than CAB for web, email and storage.
Archive & future-proof
Store in a widely-supported format that will still open on future operating systems without legacy plugins.
CAB vs ZIP — Strengths and limitations
What each format does best, and where it falls short.
CAB Strengths
- Multi-volume — designed for disk-spanning archives.
- Multiple compression algorithms in one format.
- Native Windows support for 30+ years.
- Authenticode signing integrates with Windows security stack.
- Microsoft-maintained tooling (MAKECAB, EXTRAC32, expand.exe).
Limitations
- Windows-only ecosystem — limited Mac/Linux tooling.
- Proprietary container with partial public documentation.
- Overtaken by MSI (which uses CAB internally) for new installers.
ZIP Strengths
- Universal support — every OS, every decade, every decompression tool.
- Fast random access via the Central Directory index.
- Per-file compression — each entry can use a different codec.
- Streamable and seekable.
- Royalty-free with public specification.
Limitations
- Default DEFLATE compression is weaker than modern alternatives (7z, zstd, xz).
- Legacy ZipCrypto encryption is cryptographically broken.
- Max 65,535 entries in a single ZIP (ZIP64 extension lifts this but breaks older tools).
CAB vs ZIP — Technical specifications
Side-by-side comparison of the technical details.
CAB
- MIME type
- application/vnd.ms-cab-compressed
- Extension
- .cab
- Compression
- MSZIP (DEFLATE), Quantum, LZX
- Max volume size
- 2 GB per file
- Multi-volume
- Yes (split archive spanning)
ZIP
- MIME type
- application/zip
- Compression
- DEFLATE (most common), plus Bzip2, LZMA, XZ, Zstandard
- Max entries
- 65,535 (classic), ~2^64 (ZIP64)
- Encryption
- ZipCrypto (legacy, broken), AES-128/192/256
- Variants
- JAR, DOCX, EPUB, APK, ODT, WAR
| Specification | CAB | ZIP |
|---|---|---|
| MIME type | application/vnd.ms-cab-compressed | application/zip |
| Extension | .cab | — |
| Compression | MSZIP (DEFLATE), Quantum, LZX | DEFLATE (most common), plus Bzip2, LZMA, XZ, Zstandard |
| Max volume size | 2 GB per file | — |
| Multi-volume | Yes (split archive spanning) | — |
| Max entries | — | 65,535 (classic), ~2^64 (ZIP64) |
| Encryption | — | ZipCrypto (legacy, broken), AES-128/192/256 |
| Variants | — | JAR, DOCX, EPUB, APK, ODT, WAR |
CAB vs ZIP — Typical file sizes
Approximate file sizes for common scenarios.
CAB
- Single driver package 100 KB - 20 MB
- Windows Update patch 1-500 MB
- Service pack archive 200 MB - 2 GB
ZIP
- Text document bundle 50–70% of originals
- Photo album (already compressed) ~99% of originals
- Source code repository 10–30% of originals
Quality & Compatibility
Archive conversion is strictly lossless. Byte-for-byte the files inside the ZIP are the same as those that were inside the CAB; hashes of individual entries match pre- and post-conversion. Only the container wrapper changes.
Tips for Best Results
- For maximum compression, pick the slowest level in Advanced — the decoder speed of ZIP is unaffected by how hard we crunch on our side.
- Keep a CAB backup until you have verified the ZIP opens correctly in the destination tool; archives occasionally expose codec bugs at the edge.
- Do not convert already-compressed payloads (video, music, images) expecting smaller output — archive converters cannot compress what is already at the entropy limit.
Frequently Asked Questions
Yes. The free tier accepts files up to 25 MB without registration, email capture or watermarks; paid plans go up to 2 GB. Paid plans raise the size cap, enable batch conversions and provide a REST API for automation, but nothing on the free tier is quality-limited — the output is exactly the same as on any paid plan.
Yes — because CAB and ZIP use different compression codecs, every entry is decompressed from the CAB and re-compressed for the ZIP. The uncompressed data is identical on both sides, and the re-compression happens entirely inside our processing container.
Uploads run over HTTPS, files are processed in isolated containers, and both the source CAB and the ZIP output are auto-deleted within two hours. No account is required, file contents are never logged, and KaijuConverter does not use uploads for AI training. The paid plan adds a signable data-processing agreement for regulated workflows.
Usually yes, modestly, when the original CAB used an older codec like Deflate. Against modern LZMA2 / Zstd ZIP containers expect 10-30% savings on mixed content and almost no change on pre-compressed payloads. Advanced → compression level lets you trade speed for ratio.
Most files finish in well under a minute. Small images and documents are typically ready in a few seconds; large video or audio files scale roughly with duration. Upload speed from your network is usually the dominant factor, not server time.
Yes. Provide the password during upload; we use it only to decrypt inside the processing container and never log or persist it. The resulting ZIP can be re-encrypted with a password of your choice (AES where the target format supports it).
Related comparisons
See these formats side by side to understand which fits your use case best.
Related Guides
7-Zip and 7z Format: The Complete Technical Guide
Master 7-Zip and 7z: LZMA/LZMA2 compression algorithm, solid archives, AES-256 with filename encryption, comparison with ZIP and RAR, BCJ filters for executables, self-extracting archives, split volumes, and full command-line reference.
Read guideZIP Archive Format: The Complete Technical Guide
Master ZIP: central directory architecture, DEFLATE compression, ZIP64 extensions, AES vs ZipCrypto encryption, split archives, ZIP as container (DOCX/APK/JAR), Zip Slip/Zip Bomb vulnerabilities, and command-line usage.
Read guide7Z Format: The Complete Guide to 7-Zip Archives
Everything about 7Z: LZMA2 compression, header encryption, solid archives, split archives, comparing 7Z vs ZIP vs RAR, and when to use the 7Z format.
Read guideSecure & Private Conversion
Your files are encrypted during transfer, processed in isolated containers, and automatically deleted within 60 minutes. We never read, share, or store your data.