CONVERT APK → AR (APK to AR)
Fast, secure APK to AR conversion. No registration required.
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HOW TO CONVERT APK → AR
Start the job
Upload a APK; 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 AR codec at a balanced default level.
Save the result
Download the AR when ready. Nothing about the original contents is logged or retained.
APK is a compression/archive format used to package or shrink files. Reaching a AR from there is one hop. Need to turn a APK into a AR? 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. Background. APK is a compression/archive format used to package or shrink files. Destination side, AR is a compression/archive format used to package or shrink files.
Why convert APK to AR
Some AR formats support features APK lacks: solid compression across many small files, per-file encryption, streamable headers. Repacking a legacy APK into a modern AR is how you opt into those features without changing any of the files inside.
APK vs AR — Technical specifications
Side-by-side comparison of the technical details.
APK
- MIME type
- application/vnd.android.package-archive
- Extension
- .apk
- Container
- ZIP with specific layout
- Required signature
- APK Signature Scheme v1/v2/v3/v4
- Bytecode format
- DEX (Dalvik Executable)
- MIME Type
- application/vnd.android.package-archive
- Category
- Archives & Compressed
- Full Name
- Android Package
- Conversion Engine
- ARCHIVE
AR
- MIME type
- application/x-archive
- Extension
- .ar
- MIME Type
- application/x-archive
- Category
- Archives & Compressed
- Full Name
- Unix AR Archive
- Conversion Engine
- 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
| Specification | APK | AR |
|---|---|---|
| MIME type | application/vnd.android.package-archive | application/x-archive |
| Extension | .apk | .ar |
| Container | ZIP with specific layout | — |
| Required signature | APK Signature Scheme v1/v2/v3/v4 | — |
| Bytecode format | DEX (Dalvik Executable) | — |
| MIME Type | application/vnd.android.package-archive | application/x-archive |
| Category | Archives & Compressed | Archives & Compressed |
| Full Name | Android Package | Unix AR Archive |
| Conversion Engine | ARCHIVE | 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 |
APK vs AR — Strengths and limitations
What each format does best, and where it falls short.
APK Strengths
- Universal Android distribution since 2008.
- Self-contained: one file, installs anywhere.
- Cryptographically signed — tamper-evident.
- Supports side-loading, corporate distribution, and alternative stores.
- ZIP structure makes inspection trivial.
Limitations
- Google Play prefers AAB for new submissions since 2021.
- File sizes can be large — game APKs often exceed 150 MB.
- Without code obfuscation, decompilation is straightforward.
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.
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) — AR formats that support it can shrink 20-50% over per-file compression.
- When the APK contains symlinks, test that they still resolve after conversion; some AR formats represent them differently on Windows vs Unix.
- Deterministic timestamps (via Advanced → reset mtimes) make the AR 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 APK and AR use different compression codecs, every entry is decompressed from the APK and re-compressed for the AR. 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 APK and the AR 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 APK used an older codec like Deflate. Against modern LZMA2 / Zstd AR 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 AR can be re-encrypted with a password of your choice (AES where the target format supports it).
Android Package
Source formatAPK (Android Package Kit) is the package format used by Android for distributing and installing mobile applications. It is a ZIP archive containing compiled code (DEX files), resources, assets, certificates, and the Android manifest.
Unix AR Archive
Target 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.
Going the other way? Convert AR back to APK with the same engine.
Common Use Cases
Share across platforms
Send AR files to anyone without worrying about whether they have the right software for APK.
Embed in documents
Drop AR output into Word, Google Docs, PowerPoint, Notion or a website without conversion warnings.
Optimize size
AR often produces smaller files than APK 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.
APK vs AR — Typical file sizes
Approximate file sizes for common scenarios.
- Simple utility app 2-15 MB
- Typical consumer app 30-80 MB
- Modern 3D game 150 MB - 2 GB
- 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
Need to Convert Gigabyte Archives or Mass Folders?
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Related comparisons
See these formats side by side to understand which fits your use case best.
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