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ZJX

Smaller archives.Every byte back.

ZJX Basic is available for Linux. It packs your files into compact .zjx archives, opens the formats you already have, and checks every restore against the archive's own digests. Basic is free.

Available for Linux x86_64. Free for personal use and eligible organizations.

2.1× smaller than gzip -9 (26.0 MB), and 12.0% smaller than the best of 12 other settings, bzip2 -9. The smallest of all 15 settings measured.363.5 MB of public web-server logs, ZJX Basic 1.0.3. See the full test
The ZJX icon: a black armored cube with glowing cyan seams, held shut by a gold strap and buckle

Opens what you already have.

Bring your ZIP, 7z and RAR files along. ZJX Basic will open them, and opening archives is free for everyone.

  • .zipthe classic
  • .7z7-Zip
  • .rarWinRAR
  • .tartarballs
  • .gzgzip
  • .xzxz and LZMA
  • .bz2bzip2
  • .zstZstandard

Measured on public data. Rerun it yourself.

We packed 363.5 MB of public web-server access logs with ZJX Basic 1.0.3, the free download, and 12 settings of xz, zstd, 7-Zip, brotli, gzip, bzip2 and lz4, then restored every archive and checked it byte for byte. ZJX Basic wrote the smallest archive of all 15 settings: 12.0% smaller than the best of the rest, bzip2 -9, and 18.6% smaller than xz -9e.

Archive size of a 363.5 MB fileShorter is smaller
Archive size for 363.5 MB of public web-server access logs (Elastic Rally http_logs, JSON lines), smaller is better, with compression times in seconds for ZJX Basic and the settings it outpaced.
CompressorArchive sizeTime
ZJX Basic 1.0.3 fast12.2 MB
bzip2 -913.8 MB
xz -9e14.9 MB
brotli -q 1116.0 MB
zstd --ultra -22 --long=3116.0 MB
xz -618.0 MB
7-Zip LZMA2 -mx=918.0 MB

For reference, gzip -9 made a 26.0 MB archive, 2.1× larger than ZJX's.

Smaller and faster than xz -9e.Fast compressed the file in 268.05 seconds, 2.38× faster than single-threaded xz -9e (638.34 s), and still wrote the smallest archive.

Smallest, same bytes.Smallest wrote the identical 12.2 MB archive in 365.66 seconds, also ahead of xz -9e. Use it when size is all that matters.

Ultrafast is the default.Ultrafast packed the same 363.5 MB in 3.27 seconds, for the archives you're waiting on.

Measured with the released ZJX Basic 1.0.3 on the public Elastic Rally http_logs corpus. Times are wall-clock seconds to compress on an AMD Ryzen 3 7330U (4 cores), and every archive was restored and verified by SHA-256. Showing 7 of 15 settings, including the strongest. Read the full benchmark record, with the commands to rerun it

Three modes. Pick speed or size.

Every mode writes the same .zjx format, restores byte for byte, and is free. Ultra adds a fourth, Maximum, which searches extra strategies; gains depend on what you compress.

Ultrafast

The default. Packs in parallel, for the archives you're waiting on.

Speed
Compression

Fast

Smallest-class archives in less time. On the public http_logs benchmark, Fast made the same 12.2 MB archive as Smallest, 2.38× faster than xz -9e.

Speed
Compression

Smallest

Our smallest archives, built for long-term storage.

Speed
Compression

Basic is free, with no catch.

Free for personal use and eligible organizations; commercial terms apply. Opening archives is free for everyone.

Download ZJX freefor Linux
Every byte checked
Each archive carries digests for every chunk, its manifest and the whole file. Restores are checked against them.
Yours, offline
No account, no telemetry, no license server. Your archives belong to you.
No nags, no clock
No trial timer, no upgrade prompts, no artificial speed or size caps.
Opens your old archives
Including common password-protected and split archives. The exact list ships with the release.

Five editions. One format.

ZJX Basic, Pro and Ultra are available now for Linux. Archives made with Pro and Ultra open in Basic, free. Pro, Ultra and Mythic: pay once, keep your license, and get every future update to your edition.

  1. Basic

    Create and open archives. Free for personal use and eligible organizations; commercial terms apply.

    Free

    Available for Linux

  2. Pro

    Password protection and more compression choices.

    $10

    Available now for Linux · one-time

  3. Ultra

    Pro plus Maximum, a fourth mode that searches extra strategies. Gains depend on what you compress.

    $39

    Available now for Linux · one-time

  4. Mythic

    ZJX for companies, licensed for commercial work at any size.

    $149 / seat

    Launch list open

  5. Legend

    ZJX inside your product, or tuned to your data.

    Talk to us

    Agreed in writing

Basic, Pro and Ultra are for individuals. Mythic and Legend license ZJX to organizations. Compare editions

Questions

Is ZJX Basic really free?

Yes, with no time limit, no nags and no speed or size caps. It's free for personal use, accredited schools, nonprofits and businesses with under USD 100,000 in annual revenue. Organizations with USD 100,000 or more in consolidated annual revenue, and government bodies, need a commercial license such as Mythic or Legend to create archives. Accredited schools and universities, public ones included, and qualifying nonprofits stay eligible for free use whatever their size. Opening archives is free for everyone. Read the exact conditions in the license agreement

When can I download it?

ZJX Basic 1.0.3 is available now for Linux x86_64. Download the installer, extract it and open Install ZJX Basic. The download page includes the checksum and installation instructions. Download ZJX Basic

Can other people open my .zjx files?

Yes. Anyone can download ZJX Basic for Linux and open, list and test .zjx archives for free, including archives made with paid editions.

Do I need an account or an internet connection?

No. ZJX works offline with no account, no telemetry and no activation server. Paid license keys are checked on your machine, and ZJX never sends your files or usage anywhere.

How does ZJX Basic tell me about updates?

Basic checks for a signed release while it runs. With automatic downloads on, it downloads and verifies the update in the background, but nothing installs until you click Update, and ZJX restarts only when you choose Restart ZJX. If the license terms change, you review them first. You can turn automatic downloads off in Settings and still check by hand. Basic works offline; only update checks need a connection.

What does one-time pricing mean?

You pay once and keep your license forever, including every future update to your edition for as long as we offer it. When we improve speed or compression, every edition gets better.

Pro or Ultra?

Both are available for Linux x86_64 as one-time purchases. Pro is $10 with password protection and Balanced mode. Ultra is $39 and adds Maximum, a fourth mode that searches extra strategies, plus an opt-in early-access channel for pre-release builds. Gains from Maximum depend on what you compress. Pick Ultra if you want that extra search and early builds; pick Pro if passwords and Balanced are what you need.

What if I change my mind?

Pro, Ultra and Mythic have a 30-day money-back guarantee, no reason needed. Asking to be notified costs nothing. How refunds work

Which platforms are supported?

ZJX Basic is available now for Linux x86_64. Want it on Windows or macOS? Tell us which on the download page and we'll email you when it's ready.

Get ZJX Basic.

ZJX Basic is free, offline and yours to keep. Download it now for Linux x86_64.