CONVERT AR → RPM (AR to RPM)
Fast, secure AR to RPM conversion. No registration required.
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HOW TO CONVERT AR → RPM
Start the job
Upload a AR; 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 RPM codec at a balanced default level.
Save the result
Download the RPM when ready. Nothing about the original contents is logged or retained.
Here is the short version — AR is a compression/archive format used to package or shrink files. Hence the need for RPM. Going from AR to RPM converts the wrapper around a collection of files. If your workflow speaks RPM and the backup you were sent is a AR, 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 AR is a compression/archive format used to package or shrink files. And remember that RPM is a compression/archive format used to package or shrink files.
Why convert AR to RPM
Some RPM formats support features AR lacks: solid compression across many small files, per-file encryption, streamable headers. Repacking a legacy AR into a modern RPM is how you opt into those features without changing any of the files inside.
AR vs RPM — 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
RPM
- MIME type
- application/x-rpm
- MIME Type
- application/x-rpm
- Extension
- .rpm
- Category
- Archives & Compressed
- Full Name
- RPM Package
- Conversion Engine
- ARCHIVE
- Container
- Lead + signature + header + cpio archive
- Compression
- gzip, bzip2, xz, zstd
- Managers
- rpm, dnf, yum, zypper
| Specification | AR | RPM |
|---|---|---|
| MIME type | application/x-archive | application/x-rpm |
| 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 | application/x-rpm |
| Extension | .ar | .rpm |
| Category | Archives & Compressed | Archives & Compressed |
| Full Name | Unix AR Archive | RPM Package |
| Conversion Engine | ARCHIVE | ARCHIVE |
| Container | — | Lead + signature + header + cpio archive |
| Compression | — | gzip, bzip2, xz, zstd |
| Managers | — | rpm, dnf, yum, zypper |
AR vs RPM — 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.
RPM Strengths
- Explicit dependency graphs like DEB.
- Cryptographic signing and verification.
- Mature tooling (rpm, dnf, yum, zypper).
- Every enterprise Linux distro runs on RPM.
- Self-describing metadata headers.
Limitations
- Red Hat family only — incompatible with DEB.
- Cross-distro .rpms often fail due to library version mismatches.
- "RPM dependency hell" of the late 1990s was a real phenomenon before yum.
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) — RPM formats that support it can shrink 20-50% over per-file compression.
- When the AR contains symlinks, test that they still resolve after conversion; some RPM formats represent them differently on Windows vs Unix.
- Deterministic timestamps (via Advanced → reset mtimes) make the RPM 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 AR and RPM use different compression codecs, every entry is decompressed from the AR and re-compressed for the RPM. 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 RPM 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 RPM 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 RPM 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.
RPM Package
Target formatRPM (Red Hat Package Manager) is the package format used by Red Hat, Fedora, CentOS, SUSE, and related Linux distributions. It stores compiled software with metadata, dependency information, and installation scripts in a binary format.
Going the other way? Convert RPM back to AR with the same engine.
Common Use Cases
Share across platforms
Send RPM files to anyone without worrying about whether they have the right software for AR.
Embed in documents
Drop RPM output into Word, Google Docs, PowerPoint, Notion or a website without conversion warnings.
Optimize size
RPM 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 RPM — 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
- Small CLI tool 50 KB - 1 MB
- Desktop app (LibreOffice, Firefox) 100-250 MB
- Enterprise database server 500 MB - 5 GB
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Related comparisons
See these formats side by side to understand which fits your use case best.
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