CONVERT
CAB → LZMA
Fast, secure CAB to LZMA conversion. No registration required.
DRAG. DROP. DONE.
Upload any file and our engines will handle format detection automatically.
Max 100 MB · Free plan · No signup required
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Why this pair exists — CAB is Microsoft's Cabinet archive format used in Windows installer packaging. Ergo, the LZMA route. A CAB becomes a LZMA by opening the source archive in memory and writing every entry into a new container using the LZMA codec. No files touch disk in cleartext, which is handy when the CAB is password-protected or contains sensitive folders. Worth knowing: CAB is Microsoft's Cabinet archive format used in Windows installer packaging. Meanwhile LZMA is an archive format that bundles multiple files into a single compressed container.
Windows Cabinet
Source formatCAB (Cabinet) is a Windows archive format used for software installers.
LZMA Compressed
Target formatLZMA (Lempel-Ziv-Markov chain Algorithm) is a high-ratio compression algorithm developed by Igor Pavlov for the 7-Zip archiver. It achieves significantly better compression than gzip or bzip2, especially on text and binary data, at the cost of higher memory usage.
Why convert CAB to LZMA
LZMA is supported by more systems out of the box than CAB. Windows reads LZMA 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 → LZMA
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 LZMA container.
Download the LZMA
The new archive is ready in seconds. Both files auto-delete within two hours.
Common Use Cases
Cross-platform distribution
Send a LZMA to mixed-OS teams when only Windows users can open your CAB reliably.
Backup migration
Move historical backups from legacy CAB into LZMA as your archival standard evolves.
Upload-cap-friendly packaging
Cloud portals with a 50/100 MB upload cap accept a LZMA that the larger CAB would not fit in.
Game and mod repacking
Mod distribution platforms typically require LZMA; repack your CAB build once before upload.
Quality & Compatibility
Archive conversion is strictly lossless. Byte-for-byte the files inside the LZMA 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 LZMA is unaffected by how hard we crunch on our side.
- Keep a CAB backup until you have verified the LZMA 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
Frequently Asked Questions
Yes. The free tier accepts files up to 100 MB without registration, email capture or watermarks. 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 LZMA use different compression codecs, every entry is decompressed from the CAB and re-compressed for the LZMA. 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 LZMA 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 LZMA 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 LZMA can be re-encrypted with a password of your choice (AES where the target format supports it).
Secure & Private Conversion
Your files are encrypted during transfer, processed in isolated containers, and automatically deleted within 2 hours. We never read, share, or store your data.