CONVERT
TAR → GZ
Tap to choose your fileDRAG. DROP. DONE.
Upload any file and our engines will handle format detection automatically.
Max 25 MB · Free plan · No signup required
Convert to:
Detecting available formats...
Optimize for
Leave empty to use original name. Extension added automatically.
Uploading...
Processing your file...
Fast, secure TAR to GZ conversion. No registration required.
Starting point: TAR is the Unix tape archive — a concatenation of files without compression. Natural next step, a GZ. A TAR becomes a GZ by opening the source archive in memory and writing every entry into a new container using the GZ codec. No files touch disk in cleartext, which is handy when the TAR is password-protected or contains sensitive folders. A quick refresher — TAR is the Unix tape archive — a concatenation of files without compression. By contrast, GZ is the gzip DEFLATE compression format, typically wrapped around TAR for Unix distributions.
TAR Archive
Source 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.
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.
Why convert TAR to GZ
GZ is supported by more systems out of the box than TAR. 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.
HOW TO CONVERT
TAR → GZ
Upload the TAR
Send the archive file to KaijuConverter. Entries are never written to disk in cleartext.
Repack through 7-Zip
Our pipeline opens the TAR 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.
Common Use Cases
Share across platforms
Send GZ files to anyone without worrying about whether they have the right software for TAR.
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 TAR 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.
TAR vs GZ — Strengths and limitations
What each format does best, and where it falls short.
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.
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).
TAR vs GZ — Technical specifications
Side-by-side comparison of the technical details.
TAR
- MIME type
- application/x-tar
- Extension
- .tar
- Block size
- 512 bytes (traditional)
- Header variants
- v7, ustar, POSIX.1-2001 (pax), GNU
- Max filename length
- 100 bytes (v7); unlimited (pax extended headers)
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
| Specification | TAR | GZ |
|---|---|---|
| MIME type | application/x-tar | application/gzip |
| Extension | .tar | — |
| Block size | 512 bytes (traditional) | — |
| Header variants | v7, ustar, POSIX.1-2001 (pax), GNU | — |
| Max filename length | 100 bytes (v7); unlimited (pax extended headers) | — |
| 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 |
TAR vs GZ — Typical file sizes
Approximate file sizes for common scenarios.
TAR
- 1 MB of source files (uncompressed .tar) ~1 MB
- Same files as .tar.gz 150-400 KB
- Linux kernel source (.tar.xz) ~120 MB
GZ
- Plain text file 25-40% of original
- HTML page 20-30% of original
- Source code archive 15-30% of original
- Already-compressed file (JPEG, MP4) 99-100% (no gain)
Quality & Compatibility
Archive conversion is strictly lossless. Byte-for-byte the files inside the GZ are the same as those that were inside the TAR; 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 TAR 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 TAR and GZ use different compression codecs, every entry is decompressed from the TAR 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 TAR 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 TAR 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).
RELATED CONVERSIONS
Other popular pairs involving TAR or GZ
More from TAR
More ways to reach GZ
Related comparisons
See these formats side by side to understand which fits your use case best.
Related Guides
TAR/GZ Archive Format: The Unix Compression Standard Explained
Complete guide to TAR archive format: file structure, gzip/bzip2/xz/zstd compression options, metadata preservation, incremental backups, SSH streaming, and comparison with ZIP.
Read guideRAR Archive Format: The Proprietary Compression Powerhouse
Complete guide to RAR archive format: RAR4 vs RAR5, solid archives, multi-volume splitting, recovery records, AES-256 encryption, comparison with ZIP/7z/Zstandard.
Read guideTGA Files: Truevision TARGA Format for Games, VFX, and 3D Textures
Complete guide to TGA (Truevision TARGA) image files — file structure, color depth, RLE compression, game development use cases, FFmpeg/ImageMagick conversion, and TGA vs PNG comparison.
Read guideSecure & Private Conversion
Your files are encrypted during transfer, processed in isolated containers, and automatically deleted within 60 minutes. We never read, share, or store your data.