CONVERT WAR → GZ (WAR to GZ)
Fast, secure WAR to GZ conversion. No registration required.
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HOW TO CONVERT WAR → GZ
Upload the WAR
Send the archive file to KaijuConverter. Entries are never written to disk in cleartext.
Repack through 7-Zip
Our pipeline opens the WAR in streaming mode, walks every entry and writes it into a fresh GZ container.
Download the GZ
The new archive is ready in seconds. Both files auto-delete within two hours.
Here is the short version — WAR is a compression/archive format used to package or shrink files. Hence the need for GZ. Converting WAR to GZ means repacking the files inside one archive container into another format without extracting them to disk first. KaijuConverter runs 7-Zip and libarchive server-side, so a WAR full of thousands of entries becomes a clean GZ with the same tree, timestamps and permissions preserved. Technical note: WAR is a compression/archive format used to package or shrink files. Compare that with GZ is the gzip DEFLATE compression format, typically wrapped around TAR for Unix distributions.
Why convert WAR to GZ
GZ is supported by more systems out of the box than WAR. Windows reads GZ without extra software; macOS and most Linux distros ship decoders too. Converting upstream saves every downstream user from installing a utility just to read your bundle.
WAR vs GZ — Technical specifications
Side-by-side comparison of the technical details.
WAR
- MIME type
- application/java-archive
- Extension
- .war
- Container
- ZIP (JAR format)
- Required descriptor
- WEB-INF/web.xml
- Runtime
- Servlet container (Tomcat, Jetty, GlassFish, etc.)
- MIME Type
- application/java-archive
- Category
- Archives & Compressed
- Full Name
- Web Application Archive
- Conversion Engine
- ARCHIVE
GZ
- MIME type
- application/gzip
- Extension
- .gz
- MIME Type
- application/gzip
- Category
- Archives & Compressed
- Full Name
- Gzip Compressed
- Conversion Engine
- ARCHIVE
- Extensions
- .gz, .tgz (with tar)
- Algorithm
- DEFLATE (LZ77 + Huffman coding)
- Standard
- RFC 1952 (gzip), RFC 1951 (DEFLATE)
- Header
- 10 bytes: magic, method, flags, mtime, extra, filename, comment, crc, isize
| Specification | WAR | GZ |
|---|---|---|
| MIME type | application/java-archive | application/gzip |
| Extension | .war | .gz |
| Container | ZIP (JAR format) | — |
| Required descriptor | WEB-INF/web.xml | — |
| Runtime | Servlet container (Tomcat, Jetty, GlassFish, etc.) | — |
| MIME Type | application/java-archive | application/gzip |
| Category | Archives & Compressed | Archives & Compressed |
| Full Name | Web Application Archive | Gzip Compressed |
| Conversion Engine | ARCHIVE | ARCHIVE |
| Extensions | — | .gz, .tgz (with tar) |
| Algorithm | — | DEFLATE (LZ77 + Huffman coding) |
| Standard | — | RFC 1952 (gzip), RFC 1951 (DEFLATE) |
| Header | — | 10 bytes: magic, method, flags, mtime, extra, filename, comment, crc, isize |
WAR vs GZ — Strengths and limitations
What each format does best, and where it falls short.
WAR Strengths
- Standard Java EE deployment unit since 1999.
- ZIP-based — introspectable with any unzip tool.
- Auto-deployment in Tomcat, Jetty, GlassFish, and every Java servlet container.
- Well-defined web.xml deployment descriptor.
- Compatible with any JVM.
Limitations
- Requires a servlet container runtime — heavier than a self-contained fat-JAR.
- Spring Boot fat-JARs reduce WAR's relevance in new projects.
- Not containerized — Docker-era deployment prefers JAR + embedded server.
GZ Strengths
- Patent-free, royalty-free — that was the whole point in 1992.
- Universally supported on every OS.
- Fast compression and extremely fast decompression.
- Preserves original timestamps and filenames in the header.
- Streamable — can compress/decompress over pipes.
Limitations
- Compresses one file at a time — needs tar for multi-file archives.
- Older algorithm — Zstandard, xz, and brotli all beat it on ratio.
- Single-threaded in the reference implementation (pigz fixes this).
Quality & Compatibility
Archive conversion is strictly lossless. Byte-for-byte the files inside the GZ are the same as those that were inside the WAR; hashes of individual entries match pre- and post-conversion. Only the container wrapper changes.
Tips for Best Results
- For maximum compression, pick the slowest level in Advanced — the decoder speed of GZ is unaffected by how hard we crunch on our side.
- Keep a WAR backup until you have verified the GZ opens correctly in the destination tool; archives occasionally expose codec bugs at the edge.
- Do not convert already-compressed payloads (video, music, images) expecting smaller output — archive converters cannot compress what is already at the entropy limit.
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 WAR and GZ use different compression codecs, every entry is decompressed from the WAR and re-compressed for the GZ. 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 WAR and the GZ 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 WAR used an older codec like Deflate. Against modern LZMA2 / Zstd GZ 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 GZ can be re-encrypted with a password of your choice (AES where the target format supports it).
Web Application Archive
Source formatWAR (Web Application Archive) is a JAR file used to distribute Java web applications.
Gzip Compressed
Target formatGzip is a single-file compression format based on the DEFLATE algorithm. It is most commonly paired with TAR to create .tar.gz archives and is the standard compression for web content delivery.
Common Use Cases
Share across platforms
Send GZ files to anyone without worrying about whether they have the right software for WAR.
Embed in documents
Drop GZ output into Word, Google Docs, PowerPoint, Notion or a website without conversion warnings.
Optimize size
GZ often produces smaller files than WAR 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.
WAR vs GZ — Typical file sizes
Approximate file sizes for common scenarios.
- Simple Servlet app 500 KB - 5 MB
- Typical Spring MVC app with libs 20-100 MB
- Large enterprise WAR 200-800 MB
- Plain text file 25-40% of original
- HTML page 20-30% of original
- Source code archive 15-30% of original
Need to Convert Gigabyte Archives or Mass Folders?
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High-throughput enterprise pipeline for files up to 2,048 MB, 50-file batches, ISO PDF/A, and priority processing.
Convert thousands of camera RAW files (CR3, NEF, ARW) to WebP, AVIF, or TIFF in one pass.
GPU-accelerated RAW development with end-to-end 16-bit ICC color profile management.
Related comparisons
See these formats side by side to understand which fits your use case best.
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