Guide

Zstandard & LZ4: The Modern Compression Formats Replacing Gzip

PC By Pablo Cirre • Updated May 7, 2026

Zstandard & LZ4: The Modern Compression Formats Replacing Gzip

For decades, gzip dominated compression for Linux packages, web servers, and data pipelines. Bzip2 offered better ratios but was painfully slow. Two algorithms changed everything: LZ4 (2011) and Zstandard (2016) — both achieving near-gzip or better compression ratios while being 3–10× faster.

LZ4 (2011): Speed Above All

Created by Yann Collet (the same person who later created Zstandard), LZ4 was designed with a single priority: decompression speed. On modern hardware it decompresses at roughly 4 GB/s — fast enough to saturate a RAM bus.

Compression ratio: ~1.7:1 (below gzip — larger files)
Compression speed: ~750 MB/s (6–8× faster than gzip)
Decompression speed: ~4,000 MB/s

Where LZ4 is used today:

Linux kernel (zram RAM compression, squashfs)
LVM snapshots
Docker layer caching
Redis, Cassandra, and other in-memory databases
Real-time data pipelines where latency matters more than file size

Zstandard / Zstd (2016): The New General-Purpose Standard

Created by Yann Collet at Facebook (now Meta) and open-sourced in 2016, Zstandard's design goal was to match or beat gzip's compression ratio while being much faster.

Configurable levels 1–22: level 3 ≈ gzip level 6 in ratio, but 3× faster
At level 19+: beats bzip2 in compression ratio
Facebook uses it for billions of internal compressions per day

Zstd is now standard in:

Fedora and Arch Linux packages (.tar.zst)
Ubuntu apt packages (experimental)
OpenSSH, Samba, Btrfs, FreeBSD base system
Linux kernel (CONFIG_KERNEL_ZSTD)

Compression Comparison Table

Algorithm	Ratio	Compress speed	Decompress speed	Use case
LZ4	~1.7:1	750 MB/s	4,000 MB/s	Real-time, RAM compression
Gzip (level 6)	~2.8:1	120 MB/s	400 MB/s	Web (Content-Encoding: gzip)
Zstd (level 3)	~2.9:1	400 MB/s	1,400 MB/s	Linux packages, general use
Bzip2	~3.1:1	20 MB/s	90 MB/s	Legacy (being replaced)
XZ/LZMA	~3.4:1	10 MB/s	50 MB/s	Debian packages, maximum ratio

Common File Extensions

Extension	Meaning
`.zst`	Zstandard compressed file
`.lz4`	LZ4 compressed file
`.tar.zst`	Tar archive compressed with Zstd
`.tar.lz4`	Tar archive compressed with LZ4

Working with Zstd

# Compress
zstd file.txt                    # creates file.txt.zst
zstd -19 file.txt                # maximum compression
zstd -T0 file.txt                # multi-threaded (use all cores)

# Decompress
zstd -d file.txt.zst             # or: unzstd file.txt.zst

# Compress directory (tar + zstd)
tar -I zstd -cf archive.tar.zst ./folder/

# Extract tar.zst
tar -I zstd -xf archive.tar.zst

Install zstd:

Linux (Debian/Ubuntu): sudo apt install zstd
Linux (Fedora/RHEL): sudo dnf install zstd
macOS: brew install zstd
Windows: download from the Zstd GitHub releases page

Working with LZ4

# Compress
lz4 file.txt                     # creates file.txt.lz4

# Decompress
lz4 -d file.txt.lz4

# Tar + LZ4
tar --use-compress-program=lz4 -cf archive.tar.lz4 ./folder/

Converting from Legacy Formats

If you have old archives in gzip, bzip2, or XZ format and want to recompress them with Zstd:

# Gzip to Zstd (recompress)
gzip -d -c file.gz | zstd -o file.zst

# Bzip2 to Zstd
bzip2 -d -c file.bz2 | zstd -o file.zst

# XZ to Zstd
xz -d -c file.xz | zstd -o file.zst

These commands decompress the original format via pipe and recompress to Zstd without creating an intermediate uncompressed file on disk.

Why Package Managers Switched

Fedora 31 (2019): Moved RPM packages to .tar.zst — package install speed improved ~15% due to faster decompression
Arch Linux (2020): Migrated .tar.xz packages to .tar.zst
Docker: Uses Zstd for faster image layer transfer (eStargz / OCI image spec)
npm: Under consideration for registry tarball compression

When to Use Which Format

Situation	Recommended format
Maximum decompression speed (database snapshots, RAM caches, real-time streaming)	LZ4
General-purpose replacement for gzip/bzip2	Zstd (level 3)
Maximum compression ratio, speed less important	Zstd (level 19+) or XZ
Web servers, HTTP Content-Encoding	Gzip (universal compatibility)
Legacy tools that only understand gzip	Gzip

The key takeaway: Zstd is the new default for most use cases. LZ4 wins when sub-millisecond latency is critical. Gzip stays relevant only where compatibility is non-negotiable.

Related conversions

Frequent conversions across the catalogue:

Frequently Asked Questions

Install zstd first (on Linux: `sudo apt install zstd` or `sudo dnf install zstd`; macOS: `brew install zstd`; Windows: download from GitHub). Then run `zstd -d file.zst` to decompress. For .tar.zst files, run `tar -I zstd -xf archive.tar.zst`. 7-Zip on Windows also supports .zst files from version 24+.

Install zstd first (on Linux: `sudo apt install zstd` ou `sudo dnf install zstd`; macOS: `brew install zstd`; Windows: baixar de GitHub). Then run `zstd -d file.zst` to decompress. para .tar.zst files, run `tar -I zstd -xf archive.tar.zst`. 7-Zip no Windows also suporta .zst arquivos de version 24+.

Install zstd first (on Linux: `sudo apt install zstd` oder `sudo dnf install zstd`; macOS: `brew install zstd`; Windows: herunterladen von GitHub). Then run `zstd -d file.zst` to decompress. für .tar.zst files, run `tar -I zstd -xf archive.tar.zst`. 7-Zip auf Windows also unterstützt .zst Dateien von version 24+.

Install zstd first (on Linux: `sudo apt install zstd` o `sudo dnf install zstd`; macOS: `brew install zstd`; Windows: descargar de GitHub). Then run `zstd -d file.zst` to decompress. para .tar.zst files, run `tar -I zstd -xf archive.tar.zst`. 7-Zip en Windows also soporta .zst archivos de version 24+.

On KaijuConverter every file is processed inside an isolated container, encrypted in transit (TLS 1.3) and at rest, and automatically deleted after 60 minutes with multi-pass overwrite. We never train on, share, or analyze user content. For maximum privacy on extremely sensitive material, prefer offline tools (ImageMagick, FFmpeg, LibreOffice) that you control end-to-end.

For most use cases, yes. Zstd at level 3 achieves similar compression ratios to gzip level 6 while being 3–4× faster to compress and decompress. At higher levels (15+), Zstd beats gzip in compression ratio too. The main reason to still use gzip is compatibility — web servers, old scripts, and tools that only understand gzip won't work with Zstd.

For most usar cases, yes. Zstd at level 3 achieves similar compressão ratios to gzip level 6 while being 3–4× faster to compress e decompress. At altaer levels (15+), Zstd beats gzip in compressão ratio too. The main reason to still usar gzip is compatibilidade — web servers, old scripts, e ferramentas that only understand gzip won't funcionar com Zstd.

For most verwenden cases, yes. Zstd at level 3 achieves similar Komprimierung ratios to gzip level 6 while being 3–4× faster to compress und decompress. At hocher levels (15+), Zstd beats gzip in Komprimierung ratio too. The main reason to still verwenden gzip is Kompatibilität — web servers, old scripts, und Werkzeuge that only understand gzip won't work mit Zstd.

For most usar cases, yes. Zstd at level 3 achieves similar compresión ratios to gzip level 6 while being 3–4× faster to compress y decompress. At altaer levels (15+), Zstd beats gzip in compresión ratio too. The main reason to still usar gzip is compatibilidad — web servers, old scripts, y herramientas that only understand gzip won't work con Zstd.

For 95% of use cases, yes — server-side ImageMagick, FFmpeg and LibreOffice produce identical output to the same tools on your laptop. Desktop software wins for: extremely large files (multi-GB), batch jobs of thousands of files, scripted pipelines, or content too sensitive to upload. KaijuConverter caps at 25 MB per file on the free tier (up to 2 GB on paid plans).

LZ4 prioritizes speed above all — it's the fastest general-purpose compression algorithm available, decompressing at ~4 GB/s. Zstd prioritizes the balance of speed and ratio — it compresses better than LZ4 while still being much faster than gzip. Choose LZ4 when latency matters most (real-time systems, RAM caches); choose Zstd when you want the best speed/ratio tradeoff for file archiving and distribution.

LZ4 prioritizes speed above all — it's the fastest general-purpose compressão algorithm disponível, decompressing at ~4 GB/s. Zstd prioritizes the balance of speed e ratio — it compresses melhor que LZ4 while still being much mais rápido que gzip. Choose LZ4 when latency matters most (real-time systems, RAM caches); choose Zstd when you want the best speed/ratio tradeoff para arquivo archiving e distribution.

LZ4 prioritizes speed above all — it's the fastest general-purpose Komprimierung algorithm verfügbar, decompressing at ~4 GB/s. Zstd prioritizes the balance von speed und ratio — it compresses besser als LZ4 while still being much schneller als gzip. Choose LZ4 when latency matters most (real-time systems, RAM caches); choose Zstd when you want the best speed/ratio tradeoff für Datei archiving und distribution.

LZ4 prioritizes speed above all — it's the fastest general-purpose compresión algorithm disponible, decompressing at ~4 GB/s. Zstd prioritizes the balance de speed y ratio — it compresses mejor que LZ4 while still being much más rápido que gzip. Choose LZ4 when latency matters most (real-time systems, RAM caches); choose Zstd when you want the best speed/ratio tradeoff para archivo archiving y distribution.

Most format conversions are lossy by design — JPG, MP3, MP4, WebP all discard perceptual data to save bytes. Going through a lossy intermediate compounds the loss. To minimize visible/audible drift: convert from the original master, choose a higher quality setting, and avoid converting back and forth between lossy formats.

ZIP format technically supports Zstd as a compression method (APPNOTE defines method ID 93 for Zstd), but most ZIP tools don't support it yet. 7-Zip doesn't support Zstd natively either. For Zstd compressed archives, the standard approach is tar+zstd (.tar.zst). If you need cross-platform compatibility, stick with ZIP+Deflate or 7z+LZMA2.

ZIP formato technically suporta Zstd como um compressão method (APPNOTE defines method ID 93 para Zstd), mas most ZIP ferramentas don't support it yet. 7-Zip doesn't support Zstd natively either. para Zstd comprimido archives, the padrão approach is tar+zstd (.tar.zst). If you need cross-platform compatibilidade, stick com ZIP+Deflate ou 7z+LZMA2.

ZIP Format technically unterstützt Zstd als ein Komprimierung method (APPNOTE defines method ID 93 für Zstd), aber most ZIP Werkzeuge don't support it yet. 7-Zip doesn't support Zstd natively either. für Zstd komprimiert archives, the Standard approach is tar+zstd (.tar.zst). If you need cross-platform Kompatibilität, stick mit ZIP+Deflate oder 7z+LZMA2.

ZIP formato technically soporta Zstd como un compresión method (APPNOTE defines method ID 93 para Zstd), pero most ZIP herramientas don't support it yet. 7-Zip doesn't support Zstd natively either. para Zstd comprimido archives, the estándar approach is tar+zstd (.tar.zst). If you need cross-platform compatibilidad, stick con ZIP+Deflate o 7z+LZMA2.

Yes — KaijuConverter accepts multiple files in a single drop and returns a ZIP. For very large batches (thousands of files) consider command-line tools or our API: <code>find . -name "*.heic" -exec magick {} {.}.jpg \;</code> or similar one-liners scale to millions of files when run locally.