CONVERT
CAB → GZ
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Fast, secure CAB to GZ conversion. No registration required.
Why this pair exists — CAB is Microsoft's Cabinet archive format used in Windows installer packaging. Ergo, the GZ route. Going from CAB to GZ converts the wrapper around a collection of files. If your workflow speaks GZ and the backup you were sent is a CAB, this tool rewraps the bundle for you without asking you to extract and re-compress by hand — and without leaving a scratch folder behind. Keep in mind CAB is Microsoft's Cabinet archive format used in Windows installer packaging. And remember that GZ is the gzip DEFLATE compression format, typically wrapped around TAR for Unix distributions.
Windows Cabinet
Source formatCAB (Cabinet) is a Windows archive format used for software installers.
Gzip Compressed
Target formatGzip is a single-file compression format based on the DEFLATE algorithm. It is most commonly paired with TAR to create .tar.gz archives and is the standard compression for web content delivery.
Why convert CAB to GZ
Some GZ formats support features CAB lacks: solid compression across many small files, per-file encryption, streamable headers. Repacking a legacy CAB into a modern GZ is how you opt into those features without changing any of the files inside.
HOW TO CONVERT
CAB → GZ
Start the job
Upload a CAB; we read its header to learn how many entries it carries and the compression method used.
Transcode container
Every entry is decompressed, then recompressed with the GZ codec at a balanced default level.
Save the result
Download the GZ when ready. Nothing about the original contents is logged or retained.
Common Use Cases
Share across platforms
Send GZ files to anyone without worrying about whether they have the right software for CAB.
Embed in documents
Drop GZ output into Word, Google Docs, PowerPoint, Notion or a website without conversion warnings.
Optimize size
GZ 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 GZ — 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.
GZ Strengths
- Patent-free, royalty-free — that was the whole point in 1992.
- Universally supported on every OS.
- Fast compression and extremely fast decompression.
- Preserves original timestamps and filenames in the header.
- Streamable — can compress/decompress over pipes.
Limitations
- Compresses one file at a time — needs tar for multi-file archives.
- Older algorithm — Zstandard, xz, and brotli all beat it on ratio.
- Single-threaded in the reference implementation (pigz fixes this).
CAB vs GZ — 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)
GZ
- MIME type
- application/gzip
- Extensions
- .gz, .tgz (with tar)
- Algorithm
- DEFLATE (LZ77 + Huffman coding)
- Standard
- RFC 1952 (gzip), RFC 1951 (DEFLATE)
- Header
- 10 bytes: magic, method, flags, mtime, extra, filename, comment, crc, isize
| Specification | CAB | GZ |
|---|---|---|
| MIME type | application/vnd.ms-cab-compressed | application/gzip |
| Extension | .cab | — |
| Compression | MSZIP (DEFLATE), Quantum, LZX | — |
| Max volume size | 2 GB per file | — |
| Multi-volume | Yes (split archive spanning) | — |
| Extensions | — | .gz, .tgz (with tar) |
| Algorithm | — | DEFLATE (LZ77 + Huffman coding) |
| Standard | — | RFC 1952 (gzip), RFC 1951 (DEFLATE) |
| Header | — | 10 bytes: magic, method, flags, mtime, extra, filename, comment, crc, isize |
CAB vs GZ — 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
GZ
- Plain text file 25-40% of original
- HTML page 20-30% of original
- Source code archive 15-30% of original
- Already-compressed file (JPEG, MP4) 99-100% (no gain)
Quality & Compatibility
File attributes that both formats understand (modification time, Unix permissions, symlinks) round-trip cleanly. Obscure metadata that one side lacks (e.g., advanced ACLs in one direction) is dropped silently rather than causing the conversion to fail.
Tips for Best Results
- Archives with thousands of tiny files benefit hugely from "solid" compression (one of the Advanced options) — GZ formats that support it can shrink 20-50% over per-file compression.
- When the CAB contains symlinks, test that they still resolve after conversion; some GZ formats represent them differently on Windows vs Unix.
- Deterministic timestamps (via Advanced → reset mtimes) make the GZ reproducible for CI artefact verification; otherwise two "identical" conversions will produce slightly different bytes.
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 GZ use different compression codecs, every entry is decompressed from the CAB and re-compressed for the GZ. 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 GZ 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 GZ 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 GZ 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
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Complete guide to Zstandard (ZST) and LZ4 — the modern compression algorithms replacing Gzip in Linux, Docker, databases, and package managers.
Read guideCompressing Files with Python: zip, tar, gzip and lzma
Learn to compress and decompress files with Python: zipfile for ZIP, tarfile for TAR.GZ and TAR.XZ, lzma for maximum compression, and shutil for high-level archive operations.
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.