CONVERT AR → TAR (AR to TAR)
Fast, secure AR to TAR conversion. No registration required.
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HOW TO CONVERT AR → TAR
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 TAR codec at a balanced default level.
Save the result
Download the TAR 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 TAR. Need to turn a AR into a TAR? The conversion is lossless by definition — archive formats only store file data plus metadata, and every mainstream archive supports the same primitives. File names, folder structure, timestamps and attributes round-trip exactly. One more beat. AR is a compression/archive format used to package or shrink files. Receiving format: TAR is the Unix tape archive — a concatenation of files without compression.
Why convert AR to TAR
Some TAR formats support features AR lacks: solid compression across many small files, per-file encryption, streamable headers. Repacking a legacy AR into a modern TAR is how you opt into those features without changing any of the files inside.
AR vs TAR — 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
TAR
- MIME type
- application/x-tar
- MIME Type
- application/x-tar
- Extension
- .tar
- Category
- Archives & Compressed
- Full Name
- TAR Archive
- Conversion Engine
- ARCHIVE
- Block size
- 512 bytes (traditional)
- Header variants
- v7, ustar, POSIX.1-2001 (pax), GNU
- Max filename length
- 100 bytes (v7); unlimited (pax extended headers)
| Specification | AR | TAR |
|---|---|---|
| MIME type | application/x-archive | application/x-tar |
| 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-tar |
| Extension | .ar | .tar |
| Category | Archives & Compressed | Archives & Compressed |
| Full Name | Unix AR Archive | TAR Archive |
| Conversion Engine | ARCHIVE | ARCHIVE |
| Block size | — | 512 bytes (traditional) |
| Header variants | — | v7, ustar, POSIX.1-2001 (pax), GNU |
| Max filename length | — | 100 bytes (v7); unlimited (pax extended headers) |
AR vs TAR — 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.
TAR Strengths
- Streamable — you can tar files straight to a network pipe, no seek needed.
- Preserves Unix permissions, ownership, symbolic links, and timestamps.
- Universally supported on Unix-like systems.
- Simple format — the GNU tar source has been stable for decades.
- No compression overhead — pair with gzip/xz/zstd as needed.
Limitations
- No built-in compression — plain .tar files are the same size as their contents.
- No random access — reading one file requires scanning from the start.
- Windows tooling is second-class — PowerShell only added native tar in 2018.
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) — TAR 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 TAR formats represent them differently on Windows vs Unix.
- Deterministic timestamps (via Advanced → reset mtimes) make the TAR 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 TAR use different compression codecs, every entry is decompressed from the AR and re-compressed for the TAR. 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 TAR 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 TAR 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 TAR 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.
TAR Archive
Target formatTAR is a Unix archive format that bundles files together without compression. It is commonly combined with gzip or bzip2 for compressed archives and is the standard for Linux software distribution.
Common Use Cases
Share across platforms
Send TAR files to anyone without worrying about whether they have the right software for AR.
Embed in documents
Drop TAR output into Word, Google Docs, PowerPoint, Notion or a website without conversion warnings.
Optimize size
TAR 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 TAR — 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
- 1 MB of source files (uncompressed .tar) ~1 MB
- Same files as .tar.gz 150-400 KB
- Linux kernel source (.tar.xz) ~120 MB
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Related comparisons
See these formats side by side to understand which fits your use case best.
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