Offline Wikipedia Now Runs on a Cheap ESP32 Display

An Encyclopedia on a Microcontroller

Alun Morris has got offline Wikipedia running on the Cheap Yellow Display — the widely cloned ESP32 board with a resistive touchscreen and an SD card slot that has become the default cheap project screen. Hackaday covered the build on August 29, 2026, and the code is on GitHub.

• Runs on the ESP32-based Cheap Yellow Display, using its touchscreen and onboard SD card slot with no additional hardware
• Built on Kiwix offline Wikipedia archives, reprocessed into a custom format the ESP32 browser firmware can index and render
• Uses the Simple English edition to fit the screen's constraints, with full article text and images available
• Storage is not the limit — a modern SD card comfortably holds a complete Wikipedia dump, images included

How Do You Fit Wikipedia on an ESP32?

You do not, quite — and that is the clever part. The articles live on the SD card, not in the microcontroller's memory. The ESP32's job is indexing and rendering: finding the right article in a large archive quickly, then drawing it on a small screen with a browser Morris had already built for an earlier project.

The work went into the file format. Kiwix distributes its offline archives in a container designed for phones and desktops with real filesystems and real RAM behind them. Morris reprocessed those builds into a layout an ESP32 can seek through without holding much in memory at once. That is the kind of unglamorous format engineering that makes a project like this go from theoretically possible to actually usable.

Choosing the Simple English edition is a display decision rather than a storage one. Shorter sentences and tighter articles read far better on a few square inches than the full English edition's paragraphs do.

Why This Is More Than a Neat Hack

There is a practical argument underneath the novelty. An encyclopedia that needs no network, no account and no subscription, running on a board that costs about as much as lunch, is a genuinely useful object — for a boat, a remote cabin, a go-bag, or anywhere the connection is unreliable rather than absent.

It also runs against the grain of how reference material has been trending. Most knowledge access now routes through a server somewhere. Pushing a full archive down onto an edge device with a battery is a different model, and one worth having as an option.

What You Would Need to Build One

The bill of materials is short: a Cheap Yellow Display board, an SD card sized for the archive you want, and the firmware from Morris's repository. The Kiwix project supplies the source archives, which are free and available in a range of languages and completeness levels.

If you have worked with ESP32 boards before, this is a weekend build rather than a project. The chip's ecosystem has become remarkably capable at this class of task — we have covered an ESP32-C3 flight tracker with a round display and an ESP32 DIN-rail PLC for Home Assistant in the past week alone, and the through-line is the same: a $5 microcontroller plus good firmware now covers ground that used to want a single-board computer.

That is the trend worth watching across our mini computers coverage. Not every job needs Linux. This one certainly does not.

Sources: Hackaday — August 29, 2026; Offline-Wikipedia-ESP32 on GitHub — August 2026; Kiwix — August 2026.