QR Code Generator

No. The QR image is rendered by JavaScript inside your browser, so the URL, password, or contact details you encode never reach a server. You can even disconnect from the internet after the page loads and it still works.

Error correction adds redundant data so a code still scans when part of it is dirty or covered. L recovers about 7 percent, M about 15, Q about 25, and H about 30, but higher levels pack more modules into the same square, making the pattern denser. M is a good default; choose Q or H only if you plan to print small, place a logo, or expect wear.

The tool writes a standard WIFI: string holding the network name, security type, and password, for example WIFI:T:WPA;S:Cafe Guest;P:latte2024;;. iOS and Android cameras recognize that format and offer a one-tap join, so guests never type the password. Tick Hidden network if the SSID is not broadcast.

PNG is a fixed-resolution image (rendered at 400 pixels wide) that drops straight into a document, email, or web page. SVG is vector, so it scales to any size without blurring, which is what you want for posters, packaging, or large signage sent to a print shop.

Not directly in this tool, but you can. Generate at error correction level H, then place your logo over the center in an image editor. The high redundancy lets scanners read the code even with a modest logo covering the middle, though keeping the logo under about 20 percent of the area is safest.

No. Every code here is static, meaning the data is encoded directly in the pattern rather than pointing at a redirect service. That makes it free and permanent, but it also means you cannot edit the destination later or count scans. For editable or trackable codes you need a dynamic QR service, which is a different paid product.

The usual causes are low contrast and small size. Keep a dark foreground on a light background, since inverted or low-contrast colors confuse many scanners, and print at a large enough size with a clear quiet zone around it. If you packed a long URL or a full contact card, raise the size or lower the error correction so the modules are not too fine.

The QR format itself tops out near 4,296 alphanumeric or 2,953 byte characters at the lowest error correction. Long text or a detailed vCard produces a denser code that needs to be printed larger to stay readable, so shorter payloads scan more reliably. A URL, WiFi login, or basic contact is well within comfortable range.

Yes. Use the foreground swatch for the dark modules and the background swatch for the light area. Just keep strong contrast between the two, because pale foregrounds or dark backgrounds can make the code unreadable to phone cameras.