Kiwix: carrying Wikipedia (and more) offline

There is something deeply satisfying about having all of Wikipedia on a USB drive. No internet, no cell signal, no problem. Kiwix makes this possible, and it goes way beyond just Wikipedia.

What Kiwix is

Kiwix is an offline content reader. It downloads compressed copies of websites and knowledge bases in a format called ZIM, and serves them locally through a reader app or web server. The content is fully searchable and includes images, formatting, and internal links. It looks and feels like browsing the real site, except everything is local.

What you can download

The Kiwix library includes offline copies of:

• Wikipedia (full English Wikipedia is about 100GB with images, or 45GB text-only)
• Stack Overflow (complete archive, about 55GB)
• Project Gutenberg (60,000+ free ebooks)
• Khan Academy (educational videos and articles)
• TED Talks
• WikiHow
• MDN Web Docs (Mozilla's developer documentation)
• Various language Wiktionaries and Wikivoyage

The MDN Web Docs download is particularly useful for developers. Having the full JavaScript, CSS, and HTML reference available offline means you can work without internet and still look up API documentation.

How I use it

On trips

I keep Wikipedia and MDN Web Docs on my laptop. When I am working from a remote location with limited or no internet (before pulling out the Starlink Mini), I can still look things up. Stack Overflow offline has saved me more than once when debugging without connectivity.

On my homelab

I run Kiwix Server as a Docker container on my homelab. It serves all the ZIM files over the local network, so any device in my house can access the offline content through a browser:

services:
  kiwix:
    image: ghcr.io/kiwix/kiwix-serve:latest
    container_name: kiwix
    restart: unless-stopped
    ports:
      - "8888:8080"
    volumes:
      - ./zim-files:/data
    command: "*.zim"

Drop ZIM files in the ./zim-files directory and access them at http://your-server:8888. The web interface lets you search across all loaded content from any device.

For travel

The Kiwix Android app lets you download ZIM files directly to your phone or tablet. I keep a text-only Wikipedia (about 45GB) and Wikivoyage (travel guides) on my phone. Wikivoyage is especially useful when traveling internationally without reliable data.

Downloading content

The Kiwix desktop app has a built-in library browser where you can search and download ZIM files. For server use, download ZIM files directly from the Kiwix library:

# Download English Wikipedia (text only, ~45GB)
wget https://download.kiwix.org/zim/wikipedia_en_all_nopic.zim
 
# Download MDN Web Docs (~3GB)
wget https://download.kiwix.org/zim/other/mdnwebdocs.en.zim
 
# Download Stack Overflow (~55GB)
wget https://download.kiwix.org/zim/stack_exchange/stackoverflow.com_en_all.zim

The downloads are large but they are one-time. Updated versions are released periodically and you can replace the old ZIM file when you want to refresh.

Why this matters

We take internet access for granted until we do not have it. A flight without Wi-Fi, a remote campsite, a natural disaster that takes out local infrastructure, travel in a country with censored internet. In all these situations, having offline access to reference material is genuinely valuable.

For developers specifically, having documentation available offline removes the "I cannot work without internet" problem entirely. Between offline docs (Kiwix + MDN), local AI models (Ollama), and local development tools, you can be productive in places where most people would be stuck.

The self-hosting angle

Running Kiwix Server on your homelab is a natural fit alongside other self-hosted services. It uses minimal resources (a few hundred MB of RAM for the server process), and the ZIM files sit on your existing storage. Combined with a VPN for remote access, you have your own private knowledge base accessible from anywhere.

I think of it as another piece of infrastructure independence. The same philosophy that drives self-hosting email and file storage applies to knowledge access. Why depend on someone else's servers for information you can store locally?

Sources

• Kiwix
• Kiwix ZIM Library
• Kiwix Docker