CONVERT GZ → BZ2 (GZ to BZ2)
Fast, secure GZ to BZ2 conversion. No registration required.
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HOW TO CONVERT GZ → BZ2
Provide the GZ
Drag-and-drop the archive or pick it from your computer. We accept up to 25 MB on the free tier.
Stream-convert
The GZ is decompressed and re-compressed into BZ2 in a single pipeline stage — no temporary extracted folder.
Retrieve the output
Click to download the BZ2. File structure, timestamps and permissions match the original exactly.
Setup: GZ is the gzip DEFLATE compression format, typically wrapped around TAR for Unix distributions. Goal: an interchangeable BZ2. A GZ to BZ2 job switches archive containers. The contents do not change — the same files, directories and metadata end up inside a BZ2 instead of a GZ, often because the destination system reads one format but not the other, or because a BZ2 is smaller on disk. Context: GZ is the gzip DEFLATE compression format, typically wrapped around TAR for Unix distributions. BZ2 is the bzip2 Burrows-Wheeler compression format, slower but tighter than gzip.
Why convert GZ to BZ2
A BZ2 often compresses the same content smaller than a GZ at the same strength setting, thanks to more modern codecs. For distribution over bandwidth-limited channels — email, chat apps, CDN delivery — the size difference matters.
GZ vs BZ2 — Technical specifications
Side-by-side comparison of the technical details.
GZ
- MIME type
- application/gzip
- 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
- MIME Type
- application/gzip
- Extension
- .gz
- Category
- Archives & Compressed
- Full Name
- Gzip Compressed
- Conversion Engine
- ARCHIVE
BZ2
- MIME type
- application/x-bzip2
- Extensions
- .bz2, .tbz2, .tb2
- Algorithm
- Burrows-Wheeler Transform + Huffman coding
- MIME Type
- application/x-bzip2
- Extension
- .bz2
- Category
- Archives & Compressed
- Full Name
- Bzip2 Compressed
- Conversion Engine
- ARCHIVE
- Block size
- 100-900 KB (configurable)
- Max block size
- 900 KB
| Specification | GZ | BZ2 |
|---|---|---|
| MIME type | application/gzip | application/x-bzip2 |
| Extensions | .gz, .tgz (with tar) | .bz2, .tbz2, .tb2 |
| Algorithm | DEFLATE (LZ77 + Huffman coding) | Burrows-Wheeler Transform + Huffman coding |
| Standard | RFC 1952 (gzip), RFC 1951 (DEFLATE) | — |
| Header | 10 bytes: magic, method, flags, mtime, extra, filename, comment, crc, isize | — |
| MIME Type | application/gzip | application/x-bzip2 |
| Extension | .gz | .bz2 |
| Category | Archives & Compressed | Archives & Compressed |
| Full Name | Gzip Compressed | Bzip2 Compressed |
| Conversion Engine | ARCHIVE | ARCHIVE |
| Block size | — | 100-900 KB (configurable) |
| Max block size | — | 900 KB |
GZ vs BZ2 — Strengths and limitations
What each format does best, and where it falls short.
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).
BZ2 Strengths
- 10-15% smaller than gzip for the same content.
- Block-based — partial recovery possible from corrupted archives.
- Patent-free, open-source reference implementation.
- Stable for 30+ years with no breaking changes.
Limitations
- Much slower than gzip — 3-5× the compression time.
- Still slower than xz and zstandard at modern levels.
- Single-threaded in reference; pbzip2 fixes this.
Quality & Compatibility
Compressed size can go up or down between GZ and BZ2 depending on the codec and the level — modern LZMA2/Zstd usually beats older Deflate on text, while already-compressed content (images, video) changes little. We default to a balanced level; Advanced options expose the full range.
Tips for Best Results
- If the GZ is password-protected, we will ask for the password during upload; the resulting BZ2 is emitted with encryption too if the format supports it.
- When the BZ2 has to fit a strict upload cap, split into multi-volume archives in Advanced — several smaller BZ2 parts are often accepted where a single large one is rejected.
- For distribution bundles, include a short README at the root of the BZ2 so recipients know what the archive contains without extracting it.
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 GZ and BZ2 use different compression codecs, every entry is decompressed from the GZ and re-compressed for the BZ2. 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 GZ and the BZ2 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 GZ used an older codec like Deflate. Against modern LZMA2 / Zstd BZ2 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 BZ2 can be re-encrypted with a password of your choice (AES where the target format supports it).
Gzip Compressed
Source 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.
Bzip2 Compressed
Target formatBzip2 provides higher compression ratios than gzip at the cost of slower speed. It is commonly used for .tar.bz2 archives in Linux distributions where smaller download sizes are preferred.
Going the other way? Convert BZ2 back to GZ with the same engine.
Common Use Cases
Share across platforms
Send BZ2 files to anyone without worrying about whether they have the right software for GZ.
Embed in documents
Drop BZ2 output into Word, Google Docs, PowerPoint, Notion or a website without conversion warnings.
Optimize size
BZ2 often produces smaller files than GZ 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.
GZ vs BZ2 — Typical file sizes
Approximate file sizes for common scenarios.
- Plain text file 25-40% of original
- HTML page 20-30% of original
- Source code archive 15-30% of original
- Text file 20-30% of original
- Source code archive 15-25% of original
- Linux kernel source (.tar.bz2) ~150 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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Your files are encrypted during transfer, processed in isolated containers, and automatically deleted within 60 minutes. We never read, share, or store your data.