Sobre os arquivos LZ4

LZ4 Comprimido

Lançado em 2011 Por Yann Collet

Algoritmo compressão extremamente rápido (2011). Comprime menos que gzip mas dramaticamente mais rápido. Padrão para compressão real-time em sistemas modernos.

Família

Archives & Compressed

Extensão

.lz4

Tipo MIME

application/x-lz4

Pode ser usado como

Entrada Saída

A história

COMO NASCEU O
FORMATO LZ4.

LZ4 was released in 2011 by Yann Collet — the same French engineer who would later design Zstandard at Facebook. Where most compression algorithms chase ratio, LZ4’s explicit goal was raw speed: decode at around 4 GB/s per single CPU core, with compression fast enough to keep pace with modern SSDs and RAM. The trade-off is ratio: LZ4 typically only shrinks data by 30-50%, less than gzip’s 60-70%. But for use cases where decompression speed matters more than storage size, LZ4 wins uncontested.

The Linux kernel accepted LZ4 for zram (compressed swap), initramfs (compressed boot images), and btrfs transparent compression. Databases (Apache Cassandra, RocksDB) use LZ4 for on-disk page compression because decoding is almost free. ZFS exposes LZ4 as its fastest transparent compression mode. Network protocols (Apache Kafka, PostgreSQL) offer LZ4 as a wire-format option. It’s the "compress this, don’t care about ratio" default of modern systems engineering.

CURIOSIDADES E
FATOS INTERESSANTES.

LZ4 decompresses at roughly 4 GB/s per CPU core — faster than most SSDs can read data.

Yann Collet wrote LZ4 years before he designed Zstandard — both aimed at different trade-offs on the same speed-vs-ratio curve.

Linux kernel supports LZ4 for zram swap, which is why low-RAM systems (Raspberry Pi, Chromebooks) run better under pressure.

Apache Kafka, RocksDB, Cassandra, and ZFS all offer LZ4 as a transparent-compression option.

LZ4 is dual-licensed: BSD 2-Clause for the library, GPL v2 for the command-line tool — open for any use.

VANTAGENS E
LIMITAÇÕES.

Vantagens

Decompression speed — approaches memcpy throughput.
Very fast compression — can keep up with SSD write speeds.
Stable format — reference implementation unchanged for years.
Widely deployed in databases, filesystems, and kernels.
BSD-licensed library.

Limitações

Compression ratio lags gzip by 20-30%.
Not designed for long-term archival where ratio matters.
Older than zstd, which beats LZ4 at comparable speed at slightly better ratio.
Rare as a user-facing format — lives mostly inside databases and filesystems.

Tamanhos típicos de arquivo

Text file

40-60% of original

Already-compressed data (JPEG, MP4)

99%+ (no gain)

Database page (typical)

55-70% of original

Especificações técnicas

MIME type: application/x-lz4
Extensions: .lz4
Algorithm: LZ77 variant with fast byte-level parsing
License: BSD 2-Clause (library), GPL v2 (CLI)
Typical integrations: Linux kernel, ZFS, Kafka, RocksDB, Cassandra

CONVERTER A PARTIR DE
LZ4

lz4 zip lz4 7z lz4 tar lz4 gz lz4 bz2 lz4 xz lz4 lzma lz4 zst lz4 cpio lz4 ar lz4 apk lz4 deb lz4 rpm

CONVERTER PARA
LZ4

zip lz4 7z lz4 tar lz4 gz lz4 bz2 lz4 rar lz4 xz lz4 lzma lz4 zst lz4 cpio lz4 ar lz4 apk lz4 deb lz4 rpm lz4 lz lz4 cab lz4 iso lz4 jar lz4 tgz lz4 war lz4 dmg lz4 snap lz4

Casos de uso comuns

Real-time compression, ZFS filesystem, game asset streaming, memory-mapped data