CONVERT AR → LZMA (AR to LZMA)
Fast, secure AR to LZMA conversion. No registration required.
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HOW TO CONVERT AR → LZMA
Provide the AR
Drag-and-drop the archive or pick it from your computer. We accept up to 25 MB on the free tier.
Stream-convert
The AR is decompressed and re-compressed into LZMA in a single pipeline stage — no temporary extracted folder.
Retrieve the output
Click to download the LZMA. File structure, timestamps and permissions match the original exactly.
Here is the short version — AR is a compression/archive format used to package or shrink files. Hence the need for LZMA. Our AR to LZMA converter is a bulk re-archiver. You upload an archive, we open it, stream every entry directly into a new archive of the target type and emit a LZMA bit-identical to what running 7-Zip locally would produce. Context: AR is a compression/archive format used to package or shrink files. LZMA is a compression/archive format used to package or shrink files.
Why convert AR to LZMA
A LZMA often compresses the same content smaller than a AR 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.
AR vs LZMA — Technical specifications
Side-by-side comparison of the technical details.
AR
- MIME type
- application/x-archive
- Extensions
- .a (static library), .ar (generic)
- Magic number
- "!<arch>\n" (first 8 bytes)
- Used in
- Static libraries, .deb package wrappers
- Tools
- ar, ranlib, nm
- MIME Type
- application/x-archive
- Extension
- .ar
- Category
- Archives & Compressed
- Full Name
- Unix AR Archive
- Conversion Engine
- ARCHIVE
LZMA
- MIME type
- application/x-lzma
- Extensions
- .lzma, .lz
- MIME Type
- application/x-lzma
- Extension
- .lzma
- Category
- Archives & Compressed
- Full Name
- LZMA Compressed
- Conversion Engine
- ARCHIVE
- Algorithm
- Lempel-Ziv-Markov chain + range coding
- Public domain SDK
- Yes (since 2001)
- Variants
- LZMA (original), LZMA2 (multi-threaded, used in xz)
| Specification | AR | LZMA |
|---|---|---|
| MIME type | application/x-archive | application/x-lzma |
| Extensions | .a (static library), .ar (generic) | .lzma, .lz |
| Magic number | "!<arch>\n" (first 8 bytes) | — |
| Used in | Static libraries, .deb package wrappers | — |
| Tools | ar, ranlib, nm | — |
| MIME Type | application/x-archive | application/x-lzma |
| Extension | .ar | .lzma |
| Category | Archives & Compressed | Archives & Compressed |
| Full Name | Unix AR Archive | LZMA Compressed |
| Conversion Engine | ARCHIVE | ARCHIVE |
| Algorithm | — | Lempel-Ziv-Markov chain + range coding |
| Public domain SDK | — | Yes (since 2001) |
| Variants | — | LZMA (original), LZMA2 (multi-threaded, used in xz) |
AR vs LZMA — Strengths and limitations
What each format does best, and where it falls short.
AR Strengths
- Universal Unix static-library format since 1971.
- Used as container for .deb packages.
- Simple structure — easy to parse.
- 55+ years of stability.
Limitations
- Minimal metadata.
- Multiple extended-filename variants cause subtle incompatibilities.
- Not a general-purpose archive format.
LZMA Strengths
- Highest-ratio mainstream compression (beats gzip by 30%).
- Public domain SDK — royalty-free.
- Mature since 1998 with no breaking changes.
- Core of 7z, xz, .tar.xz workflows.
- Multi-threaded LZMA2 scales across CPU cores.
Limitations
- Slow compression at highest settings.
- Memory-hungry — 1 GB+ for extreme compression levels.
- Zstandard matches its ratios at less memory cost.
Quality & Compatibility
Compressed size can go up or down between AR and LZMA 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 AR is password-protected, we will ask for the password during upload; the resulting LZMA is emitted with encryption too if the format supports it.
- When the LZMA has to fit a strict upload cap, split into multi-volume archives in Advanced — several smaller LZMA parts are often accepted where a single large one is rejected.
- For distribution bundles, include a short README at the root of the LZMA 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 AR and LZMA use different compression codecs, every entry is decompressed from the AR 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 AR 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 AR 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).
Unix AR Archive
Source formatAR is one of the oldest Unix archive formats, used primarily to group compiled object files into static libraries (.a files). It is also the basis of Debian .deb packages, which are AR archives containing control and data tar files.
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.
Going the other way? Convert LZMA back to AR with the same engine.
Common Use Cases
Share across platforms
Send LZMA files to anyone without worrying about whether they have the right software for AR.
Embed in documents
Drop LZMA output into Word, Google Docs, PowerPoint, Notion or a website without conversion warnings.
Optimize size
LZMA often produces smaller files than AR 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.
AR vs LZMA — Typical file sizes
Approximate file sizes for common scenarios.
- Small static library (libm.a) 500 KB - 5 MB
- Large C++ template library 50-500 MB
- .deb package (wrapping two tar.gz) 100 KB - 300 MB
- Text/source archive 15-25% of original
- Linux kernel source (.tar.xz = LZMA2) ~125 MB
- Windows system backup (.lzma) 25-40% of original
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Related comparisons
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