LZ4 to XZ Converter
Processing entirely on your device — large files may take a moment.
Unpack XZ into ZIP/TAR for tools that cannot read LZMA2. If your files are still in LZ4 format, this page is the shortcut: LZ4 is the speed king of compression — hundreds of MB/s on commodity hardware, the default for kernel initramfs images and big-data pipelines.
This converter runs entirely in your browser using WebAssembly — your files never leave your device, nothing is uploaded, and there are no watermarks, sign-ups or queues. Drop in several files at once to convert them as a batch.
How to convert LZ4 to XZ
- 1
Select your files
Select your LZ4 file.
- 2
Convert instantly
The file bytes are gzip-compressed in place — the same archive your server or build tool produces, made locally.
- 3
Download results
Download the .gz file — ready to upload, serve or attach.
About the LZ4 format
LZ4 trades compression ratio for near-memcpy speed: hundreds of megabytes per second in both directions, which is why initramfs images, database WALs and big-data shuffles default to it. It is the format you choose when decompression must never be the bottleneck.
7-Zip reads .lz4 natively (tar.lz4 bundles unwrap to a full tar), making browser-side repackaging into zip or tar a one-click affair.
+Strengths
- ✓Fastest mainstream decompression
- ✓Frame format carries content size/checksums
- ✓Default in kernels and data platforms
!Limitations
- −Large files compared to xz/zstd
- −Legacy block format vs frame format confusion
- −Not everyone's archive tool supports it
About the XZ format
XZ wraps the LZMA2 algorithm: the best ratio of the common Unix compressors, which is why distribution packages and source releases pick it when bandwidth matters more than CPU.
Windows Explorer and many cross-platform tools cannot open it — unpacking to ZIP or TAR makes the payload portable.
+Strengths
- ✓Highest common ratio
- ✓Standard for Linux packages
- ✓Integrity checks built in
!Limitations
- −Memory-hungry at high settings
- −Sparse support outside Linux
Why convert LZ4 to XZ?
Converting makes sense where the strengths of XZ meet what LZ4 cannot give you. Highest common ratio Meanwhile Large files compared to xz/zstd One pass through the converter above puts your file on the right side of that trade-off.
Frequently asked questions
Is this LZ4 to XZ converter really free?
Yes — completely free, with no sign-up, no watermark and no daily conversion limits. The site is supported by advertising.
Are my files uploaded to a server?
No. The conversion runs entirely inside your browser using WebAssembly, so your files never leave your device — that is what makes it instant and private.
Does it work on Windows, Mac, iPhone and Android?
Yes. Anything with a modern browser works: Windows, macOS, Linux, Android and iOS. No software installation is required.
Is there a file size limit for LZ4 to XZ?
The only limit is your device's memory, since nothing is uploaded. Files up to a few hundred megabytes work fine on a modern desktop browser; very large files simply take a little longer.
What about folders and directory structure?
The full directory tree is preserved: folders stay folders, and deep paths arrive exactly as they were packed in the LZ4 file.
Are the files inside my LZ4 archive modified?
No. Contents are unpacked in memory and repacked into XZ byte-for-byte — the conversion changes the container, never the files inside it.