CONVERT
7Z → XZ
Fast, secure 7Z to XZ conversion. No registration required.
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Situation. 7Z is the 7-Zip archive format, offering higher compression ratios than ZIP via LZMA. Solution: a XZ, produced below. 7Z to XZ conversion is the fastest path when the platform or tool you are shipping to does not speak 7Z. Instead of asking every recipient to install a decoder, produce a XZ once and hand them something their OS opens natively. In practice 7Z is the 7-Zip archive format, offering higher compression ratios than ZIP via LZMA. On the other end, XZ is the LZMA2-based compression format used for tight compression of source tarballs.
7-Zip Archive
Source format7z uses the LZMA2 compression algorithm to achieve significantly better compression ratios than ZIP. It is open-source and supports strong AES-256 encryption.
XZ Compressed
Target formatXZ provides very high compression ratio using LZMA2, common in Linux packages.
Why convert 7Z to XZ
A XZ often compresses the same content smaller than a 7Z 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.
HOW TO CONVERT
7Z → XZ
Provide the 7Z
Drag-and-drop the archive or pick it from your computer. We accept up to 100 MB on the free tier.
Stream-convert
The 7Z is decompressed and re-compressed into XZ in a single pipeline stage — no temporary extracted folder.
Retrieve the output
Click to download the XZ. File structure, timestamps and permissions match the original exactly.
Common Use Cases
Legacy format rescue
Re-archive decades-old 7Z collections into XZ before the 7Z tooling disappears from modern package managers.
Cloud storage optimisation
XZ tends to compress better than 7Z on text-heavy payloads — fewer bytes stored means lower monthly costs.
CI/CD artefact pipelines
Build agents publish artefacts as XZ when downstream jobs consume XZ natively; avoid an extra extract-and-rezip step.
Mobile sharing
Phone archive apps handle XZ out of the box but may prompt the user to install extra software for 7Z.
7Z vs XZ — Strengths and limitations
What each format does best, and where it falls short.
7Z Strengths
- Outstanding compression ratio — typically 20–50% smaller than ZIP, 10–30% smaller than RAR.
- Completely free and open source.
- AES-256 encryption of both content and filenames.
- Supports enormous archives (16 exabytes).
- Multi-threaded compression on modern CPUs.
Limitations
- Not natively supported on Windows before Windows 11 23H2 or macOS — requires a separate tool.
- Slower compression than ZIP (though decompression is fast).
- No built-in recovery records like RAR.
XZ Strengths
- Best-in-class compression ratio among mainstream tools.
- Streaming-capable — can pipe through network.
- Multi-threaded compression available.
- Mature on every Linux distribution.
- Supports integrity checking (CRC32, CRC64, SHA-256).
Limitations
- Slow compression at high levels — 3-5× slower than gzip.
- Memory-hungry: xz -9 can need 700+ MB to compress.
- 2024 supply-chain backdoor damaged trust in the project.
7Z vs XZ — Technical specifications
Side-by-side comparison of the technical details.
| Specification | 7Z | XZ |
|---|---|---|
| MIME type | application/x-7z-compressed | application/x-xz |
| Compression | LZMA, LZMA2, PPMd, Bzip2, DEFLATE | — |
| Max file size | 16 EB (exabytes) | — |
| Encryption | AES-256 (content + filenames) | — |
| License | LGPL | — |
| Extensions | — | .xz, .txz |
| Algorithm | — | LZMA2 |
| Standard | — | The .xz File Format specification 1.1.0 |
| Integrity checks | — | None, CRC32, CRC64, SHA-256 |
7Z vs XZ — Typical file sizes
Approximate file sizes for common scenarios.
7Z
- Source code archive ~50% smaller than ZIP
- Linux distro installer 2–10 GB
- Virtual machine disk image 5–40 GB
XZ
- Text/source archive 15-25% of original
- Linux kernel (.tar.xz) ~125 MB
- Firefox source code ~600 MB
Quality & Compatibility
Compressed size can go up or down between 7Z and XZ 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 7Z is password-protected, we will ask for the password during upload; the resulting XZ is emitted with encryption too if the format supports it.
- When the XZ has to fit a strict upload cap, split into multi-volume archives in Advanced — several smaller XZ parts are often accepted where a single large one is rejected.
- For distribution bundles, include a short README at the root of the XZ so recipients know what the archive contains without extracting it.
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 7Z and XZ use different compression codecs, every entry is decompressed from the 7Z and re-compressed for the XZ. 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 7Z and the XZ 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 7Z used an older codec like Deflate. Against modern LZMA2 / Zstd XZ 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 XZ can be re-encrypted with a password of your choice (AES where the target format supports it).
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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.