Your logo on the WiFi code, guests still connect on one tap
Placing a logo on a WiFi code works when you lift the error correction to H, because the mark blanks out centre modules and only high recovery rebuilds them. The payload holds your SSID, password and encryption type, so those details still reach the phone untouched behind the artwork.
One thing to weigh before you brand it: a WiFi code stores the password in plain text, so the prettier and more prominent it is on a counter, the more people can copy it. A branded guest-network code is the sensible thing to display, not your main network.
High correction for a logo, but mind the payload length
Set the code to H before adding the logo. A full SSID plus a long password makes the code denser than a bare link, so the modules are smaller and a logo bites harder into them — H's recovery margin is what keeps it readable.
If your guest password is long and the branded code stubbornly won't scan, either shorten the guest password or shrink the logo. The WiFi format allows up to 4,296 characters, but density, not the limit, is what fights the logo.
Brand the guest network, not your home WiFi
A logo turns the code into signage, and signage gets photographed. Encode a router guest network with its own SSID and password so anyone who scans reaches the internet but never your printers, NAS or smart devices.
This also lets you rotate the guest password on a schedule. Reprinting one branded card is cheap, and your main network credentials never appear on a public counter.
- Guest SSID on the branded card, main network hidden away.
- Rotate the guest password every few months.
- Keep the logo centred so the finder corners stay clean.
Contrast around the logo
Give the logo a solid pad so its edge is crisp against the pattern, and don't tint the code so light that the scanner struggles to tell dark modules from the background. The camera has to lock onto the grid before error correction can do its job.
Leave the quiet-zone margin around the whole code. Table tents and window decals often get trimmed too close, and a clipped margin fails just as reliably as an oversized logo.
How to add a logo to a WiFi code
- Fill the ssid and encryption. Enter the guest network name exactly, case included, and set encryption to WPA for almost any modern router.
- Enter the guest password. Paste the password into the password field; symbols are escaped for you. Use the guest network, never your main one.
- Switch correction to H. Do this before adding the logo. The usual slip is branding a default-level code, which a long password then makes too fragile to scan.
- Add logo and test. Place it centred, under 30% of the area, then scan from a hand's distance with an iPhone and an Android before printing.
Technical details
- Maximum characters: 4296
- Recommended error correction: H (high) — a center logo covers modules, and high recovery lets scanners rebuild them
- Payload format: WIFI:T:<auth>;S:<ssid>;P:<password>;H:<hidden>;;
- A longer SSID and password raise density, so favour a smaller logo than a link code would tolerate.
Frequently asked questions
- Can I add a logo to a WiFi QR code without breaking the connection?
- Yes, if you raise error correction to H first. The logo covers centre modules and H's redundant data rebuilds them, so the SSID and password still decode. Keep the logo under about 30% of the area and test on a real phone before printing.
- Why does my branded WiFi code fail when the plain one worked?
- A WiFi payload with a long password is denser than a simple link, so a logo covers proportionally more data. Raise the level to H, shrink the logo, or shorten the guest password. Also check the outer margin wasn't trimmed off during printing.
- Is it safe to put a logo on my WiFi code and display it?
- Only if it encodes a guest network. The code stores the password in plain text, so a branded card on a counter effectively publishes it. Use a separate guest SSID, keep the main network off the sign, and rotate the guest password periodically.
- Does the logo change how iPhones and Androids read it?
- No. Both read the module grid, not the artwork. iOS 11+ and Android 10+ handle WiFi codes from the native camera regardless of a centred logo, provided the pattern stays high-contrast and the logo doesn't sit over a corner finder square.
- How much of the WiFi code can the logo cover?
- Roughly 30% of the area at most, centred. Because WiFi payloads run longer than a link, err toward smaller. If the scan hesitates, reduce the logo before touching anything else — oversized artwork is the most common cause of failure.
- Should the logo have a transparent background?
- Better to give it a solid pad. A transparent logo lets the pattern show through and smears the boundary between mark and modules, which slows the decode. A clean solid edge helps the camera separate picture from pattern quickly.