CONVERT CAB → LZ4 (CAB to LZ4)
Fast, secure CAB to LZ4 conversion. No registration required.
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HOW TO CONVERT CAB → LZ4
Provide the CAB
Drag-and-drop the archive or pick it from your computer. We accept up to 25 MB on the free tier.
Stream-convert
The CAB is decompressed and re-compressed into LZ4 in a single pipeline stage — no temporary extracted folder.
Retrieve the output
Click to download the LZ4. File structure, timestamps and permissions match the original exactly.
Why this pair exists — CAB is Microsoft's Cabinet archive format used in Windows installer packaging. Ergo, the LZ4 route. A CAB to LZ4 job switches archive containers. The contents do not change — the same files, directories and metadata end up inside a LZ4 instead of a CAB, often because the destination system reads one format but not the other, or because a LZ4 is smaller on disk. In practice CAB is Microsoft's Cabinet archive format used in Windows installer packaging. On the other end, LZ4 is a compression/archive format used to package or shrink files.
Why convert CAB to LZ4
A LZ4 often compresses the same content smaller than a CAB at the same strength setting, thanks to more modern codecs. For distribution over bandwidth-limited channels — email, chat apps, CDN delivery — the size difference matters.
CAB vs LZ4 — 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)
LZ4
- MIME type
- application/x-lz4
- Extensions
- .lz4
- Algorithm
- LZ77 variant with fast byte-level parsing
- License
- BSD 2-Clause (library), GPL v2 (CLI)
- Typical integrations
- Linux kernel, ZFS, Kafka, RocksDB, Cassandra
| Specification | CAB | LZ4 |
|---|---|---|
| MIME type | application/vnd.ms-cab-compressed | application/x-lz4 |
| Extension | .cab | — |
| Compression | MSZIP (DEFLATE), Quantum, LZX | — |
| Max volume size | 2 GB per file | — |
| Multi-volume | Yes (split archive spanning) | — |
| Extensions | — | .lz4 |
| Algorithm | — | LZ77 variant with fast byte-level parsing |
| License | — | BSD 2-Clause (library), GPL v2 (CLI) |
| Typical integrations | — | Linux kernel, ZFS, Kafka, RocksDB, Cassandra |
CAB vs LZ4 — 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.
LZ4 Strengths
- Decompression speed — approaches memcpy throughput.
- Very fast compression — can keep up with SSD write speeds.
- Stable format — reference implementation unchanged for years.
- Widely deployed in databases, filesystems, and kernels.
- BSD-licensed library.
Limitations
- Compression ratio lags gzip by 20-30%.
- Not designed for long-term archival where ratio matters.
- Older than zstd, which beats LZ4 at comparable speed at slightly better ratio.
Quality & Compatibility
Compressed size can go up or down between CAB and LZ4 depending on the codec and the level — modern LZMA2/Zstd usually beats older Deflate on text, while already-compressed content (images, video) changes little. We default to a balanced level; Advanced options expose the full range.
Tips for Best Results
- If the CAB is password-protected, we will ask for the password during upload; the resulting LZ4 is emitted with encryption too if the format supports it.
- When the LZ4 has to fit a strict upload cap, split into multi-volume archives in Advanced — several smaller LZ4 parts are often accepted where a single large one is rejected.
- For distribution bundles, include a short README at the root of the LZ4 so recipients know what the archive contains without extracting it.
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 LZ4 use different compression codecs, every entry is decompressed from the CAB and re-compressed for the LZ4. 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 LZ4 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 LZ4 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 LZ4 can be re-encrypted with a password of your choice (AES where the target format supports it).
Windows Cabinet
Source formatCAB (Cabinet) is a Windows archive format used for software installers.
LZ4 Compressed
Target formatLZ4 is an extremely fast lossless compression algorithm focused on speed over compression ratio. It can compress at over 500 MB/s per core and decompress at multiple GB/s, making it the standard choice for real-time and in-memory compression.
Common Use Cases
Share across platforms
Send LZ4 files to anyone without worrying about whether they have the right software for CAB.
Embed in documents
Drop LZ4 output into Word, Google Docs, PowerPoint, Notion or a website without conversion warnings.
Optimize size
LZ4 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 LZ4 — Typical file sizes
Approximate file sizes for common scenarios.
- Single driver package 100 KB - 20 MB
- Windows Update patch 1-500 MB
- Service pack archive 200 MB - 2 GB
- Text file 40-60% of original
- Already-compressed data (JPEG, MP4) 99%+ (no gain)
- Database page (typical) 55-70% of original
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Related comparisons
See these formats side by side to understand which fits your use case best.
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Your files are encrypted during transfer, processed in isolated containers, and automatically deleted within 60 minutes. We never read, share, or store your data.