Convert RPM to RAR Online (The One Repackaging Target That Needs Licensed Software to Finish)
Every other RPM conversion target has a free tool that writes it — RAR is the one exception, since only WinRAR or RARLAB's own licensed rar binary can legally create the archive at the end.
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The Only RPM Repackaging Target That Isn't Free to Build
An RPM's actual files sit inside its Payload section as a compressed cpio archive, entirely separate from the Lead, Signature, and Header sections that carry identification data, digests, and package metadata. Converting that payload to tar, tar.gz, tar.bz2, ZIP, or 7z is always a two-step process — extract with rpm2cpio and cpio, then repackage with a free tool — and every one of those destination formats has a free, openly documented archiver that writes it: GNU tar, gzip, bzip2, Info-ZIP's zip, or p7zip. RAR breaks that pattern entirely. RARLAB, the company behind WinRAR, has never published RAR's compression algorithm as an open standard, and the license covering the separate unRAR extraction code explicitly forbids using it to build a RAR-compatible archiver capable of creating new archives. Getting from RPM to a genuine .rar file means extracting the cpio payload exactly the same way as any other conversion, then handing the result to either WinRAR on Windows or RARLAB's own licensed command-line rar binary on Linux — there is no free-software equivalent for this last step.
RARLAB does sell that Linux command-line rar tool directly through its own website as a separate download from the Windows GUI, and its license permits using the tool itself to create archives, since the restriction specifically targets the unRAR extraction source code, not RARLAB's own compressor. That distinction, licensed creation tool versus extraction-only source code, is the entire reason this particular conversion needs paid or trial software somewhere in the chain, while every other target format on this list doesn't.
Cpio's Continuous Stream Lines Up Naturally With RAR's Solid Mode
Structurally, cpio and RAR share more in common than either does with ZIP: cpio bundles a package's files as one sequential stream of headers and data, and RPM's own payload compressor runs across that entire stream rather than treating each file independently — which is functionally close to what RAR's solid archiving mode does deliberately, compressing a whole batch of files as one continuous unit so its algorithm can find repeated patterns across file boundaries. That overlap means a RAR built from an RPM's extracted files, with solid mode turned on in WinRAR's archive options, can genuinely approach or beat the original RPM payload's compression ratio, depending on which algorithm the RPM used internally and at what settings.
Where the two diverge is in what the compressed stream is allowed to protect. RAR5 layers AES-256 encryption with PBKDF2-SHA256 key derivation (131,072 rounds) on top of that solid stream, plus an optional Reed-Solomon recovery record for rebuilding a damaged archive — protections RPM's own cpio payload has no equivalent for at all, since RPM instead relies on a completely separate mechanism, the GPG signature stored in its own Signature section, to prove a package hasn't been tampered with.
What Repackaging RPM Contents Into RAR Actually Changes
- Cost — no free creation path: unlike every other target format for this conversion, producing a real .rar file requires WinRAR or RARLAB's own licensed rar binary, not a free tool like p7zip or Info-ZIP.
- Gain — solid-mode compression across the whole extracted payload: similar in spirit to cpio's own sequential structure, letting RAR's algorithm find patterns across the package's files as one unit.
- Gain — stronger, verified password protection: RAR5's AES-256 with PBKDF2-SHA256 key derivation is a real upgrade over having no archive-level encryption at all, which is RPM's situation once the GPG-signed Signature section is stripped away during extraction.
- Lose — every install scriptlet and the dependency graph: %pre/%post/%preun/%postun scripts and the package's Requires/Provides list live only in the RPM Header, which cpio-reading extraction tools never touch.
- Lose — the GPG signature and digest verification: RAR has no cryptographic-signature concept comparable to RPM's Signature section for proving an archive's origin.
- Gain — an optional recovery record: WinRAR's Repair function can use an embedded Reed-Solomon record to rebuild a damaged archive, something neither cpio nor the original RPM format provides.
Where the RAR-Creation Step Actually Runs
On Linux, the documented sequence is rpm2cpio package.rpm | cpio -idmv to extract the files, followed by RARLAB's own command-line rar a package.rar ./extracted-folder, using the rar binary downloaded directly from rarlab.com and installed with make install after extracting its tarball — it is not typically bundled in a distribution's default repositories the way p7zip or zip usually is, precisely because it's licensed software rather than an open-source package.
On Windows, 7-Zip can open an .rpm file directly and browse into the embedded cpio archive without any extra tool, but 7-Zip itself cannot write the final .rar — that step still requires WinRAR specifically, since 7-Zip's own RAR support, like every other free archiver's, is extraction-only under the same unRAR license restriction. WinRAR remains fully functional past its 40-day trial period, showing a licensing reminder on each launch rather than actually stopping, so the RAR-creation half of this conversion works without payment during that window and continues working, with the nag screen, indefinitely afterward.
Documented Problems Specific to This Conversion
A recurring point of confusion is expecting a free tool like p7zip, PeaZip, or 7-Zip to write a .rar file the same way it writes a .7z or .zip — none of them can, and it's not a missing feature or a bug; the unRAR license under which those tools read RAR archives explicitly bars using that code to build an archiver capable of creating new ones, so this limitation is intentional on RARLAB's part, not an oversight by the other software's developers.
A second, well-documented issue involves the same 07070X cpio variant problem that affects every RPM conversion target: RPM 4.12 and later use a stripped-down cpio format for packages containing files over 4 GB, and older rpm2cpio or cpio builds that don't recognize its magic bytes will fail during the extraction step, before the RAR-creation step is even reached — updating the rpm-tools package resolves it.
A third pattern shows up around numeric file ownership carried over from the RPM's cpio payload: build-system UID and GID values that don't correspond to any real account on the machine performing the conversion can leave the extracted-then-rarred files owned by unfamiliar or nonexistent numeric users, requiring a manual ownership reset before or after building the RAR archive.
A fourth complaint is specific to automated build pipelines that try to script this conversion end-to-end: because RARLAB's Linux rar binary isn't distributed through standard package managers like apt or dnf, a CI/CD pipeline has to either bundle a licensed copy of the binary itself or fall back to a different target format entirely, unlike every other RPM conversion path on this list, which can rely on tools already present in a stock Linux repository.
RPM's Payload Against a RAR Rebuilt From It
| Aspect | Original RPM | Converted RAR |
|---|---|---|
| Container for file entries | Cpio (SVR4 or 07070X) | RAR's proprietary block structure |
| Free tool available to create it | N/A (built by rpmbuild) | None; WinRAR or RARLAB's own rar binary only |
| Solid-style compression | Yes, inherent to the cpio stream | Yes, when solid mode is enabled |
| Encryption | None on the payload itself | Optional AES-256, PBKDF2-SHA256 |
| Authenticity verification | GPG signature in Signature section | Not present; no equivalent field |
| Built-in recovery record | Not present | Optional Reed-Solomon record |
| Installable via a package manager | Yes, on RPM-based systems | No — plain compressed files only |
Frequently Asked Questions About Converting RPM to RAR
Why can't I just use p7zip or PeaZip to create the RAR file?
Those tools can only extract RAR archives, not create them, because the unRAR license they rely on explicitly forbids using that code to build a RAR-compatible archiver. Only WinRAR or RARLAB's own licensed rar binary can legally create a new .rar file.
Is there a free version of RAR for Linux?
RARLAB sells a command-line rar tool for Linux directly from its own website, separate from the Windows WinRAR GUI. It's not bundled in standard distribution repositories the way free archivers are, since it's licensed software rather than open source.
Will the RAR file still let me reinstall the software as a package?
No. Dependencies, version metadata, and install scriptlets live only in the RPM's Header section, which extraction tools reading the cpio Payload never touch, so a RAR built from those files carries none of that information.
Why did my rpm2cpio command fail before I even got to the RAR step?
RPM 4.12 and later use a stripped-down cpio format for packages with files over 4 GB, and older rpm2cpio or cpio builds don't recognize it — updating those tools fixes the extraction failure that happens before RAR is even involved.
Does WinRAR stop working if I don't pay for a license?
No. WinRAR keeps functioning past its 40-day trial period; it just displays a licensing reminder on every launch afterward rather than disabling any actual features.