Wi-Fi QR Code Generator

• Encodes the standard WIFI:T:WPA;S:...;P:...;; format
• iOS 11+ and Android 10+ join automatically on scan
• Older Android needs an app such as Google Lens
• Choose WPA for modern routers; leave blank if open

The code contains a short text string in a standard format — WIFI:T:WPA;S:NetworkName;P:Password;; — that phones recognize. When scanned, iOS (11 and later) and Android (10 and later) show a “Join network” prompt and connect without the user typing anything. Older Android phones need a QR app such as Google Lens.

Choose WPA for any modern router — it covers WPA2 and WPA3. WEP exists only for routers from the 2000s. For an open network with no password, pick “Open network” and leave the password blank. Tick “Hidden network” only if you disabled SSID broadcast on the router.

• A common English SSID + password (36 bytes) needs only version 3, 29×29
• Korean text costs about 3 bytes per character: a 55-byte Korean case still lands at 33×33
• A 63-character password pushes it to version 6, 41×41
• An open network with no password is the sparsest, 25×25

We generated six Wi-Fi codes with the site's own library and settings (error correction M; the quiet zone does not change the grid) and measured the resulting grid. A typical café case — SSID CafeGuest, password guest2026, 36 bytes — needed QR version 3, 29×29 modules. Swapping in a Korean SSID (41 characters, but 55 bytes because Korean text costs about 3 bytes per character) bumped it one step to version 4, 33×33. A 63-character alphanumeric password reached version 6, 41×41, while an open network with no password at all stayed the sparsest at version 2, 25×25. For comparison, a typical Korean business-card vCard code needs 57×57 — Wi-Fi codes are much sparser because they carry far less data.

All six cases decoded back exactly right at 512px with jsQR, the open-source reader the site uses for its own scan check — including the special-character password pa;ss,wo:rd"1, which the generator escapes to pa\;ss\,wo\:rd\"1 and which decoded back identically. What we have not tested is joining a real network with a phone camera: whether iOS or Android actually connects when it scans one of these codes was not verified on a device.

• Cafés print it on table tents and menus
• Rentals put it in the welcome booklet
• 3 cm at 300 dpi works out to about 0.81 mm per module (arithmetic, not a scan test)

Cafés and restaurants print it on table tents and menus; short-term rentals put it in the welcome booklet; offices post a guest-network code at reception; families stick one on the fridge for visitors. As arithmetic only: a common Wi-Fi code (29×29 modules, plus the default 4-module quiet zone on each side) printed 3 cm wide at 300 dpi puts about 0.81 mm in every module, and 2 cm about 0.54 mm; a denser 41×41 password code works out to about 0.61 mm at the same 3 cm, and a business-card vCard code (57×57) to about 0.46 mm. These are calculations, not a scan test — write the network name underneath so people know what they are joining.

• The password is stored as plain text in the code
• Fine for guest Wi-Fi, but don't post the image publicly
• A new password needs a new code; the old one just fails
• Network details never leave your browser

A Wi-Fi QR code stores the password as plain text. Anyone who scans it — or opens the image file — can read it with a QR reader app. That is fine for a guest network or a café, but do not post the image on social media or use it for the network your computers and cameras are on. If you change the password, print a new code; the old one simply stops working.

This page never sends your network details anywhere: the code is built by your browser, and you can verify that in the browser's network tab.