QR Code Generator

What is a QR code?

A QR (Quick Response) code is a two-dimensional barcode that stores data in a grid of black and white modules. Unlike a traditional barcode, which encodes a short number along a single axis, a QR code stores information both horizontally and vertically — up to about 4,296 alphanumeric characters in the largest versions.

The three large squares in the corners are finder patterns that let a camera locate and orient the code from any angle, which is why scanning works upside down or at a tilt. Built-in Reed–Solomon error correction means a code still resolves even when part of it is scratched, covered or printed over.

What you can encode

A QR code is just text, but scanners recognise standard prefixes and act on them — which is what turns a code into a Wi-Fi login or a contact card.

• URLs — the most common use: menus, product pages, payment links, event pages.
• Wi-Fi credentials — network name, security type and password, so guests join without typing.
• Plain text — serial numbers, instructions, asset tags, inventory references.
• Contact details (vCard) — name, phone, email and company saved to a phone in one tap.
• Email, SMS and phone numbers — pre-filled messages and one-tap dialling.
• Geographic coordinates and calendar events.

Error correction levels explained

Every QR code carries redundant data so it survives damage. There are four levels: L recovers about 7% of the code, M about 15%, Q about 25% and H about 30%. Higher correction means more modules, so the pattern gets denser for the same content.

Choose L or M for clean digital use such as a website or slide deck. Choose Q or H for anything printed on packaging, stickers, outdoor signage, or when you plan to place a logo in the middle of the code — the logo effectively 'damages' the centre, and only a high correction level can absorb that.

Static vs dynamic codes, and sizing for print

The Nesake generator makes static codes: the data is encoded directly into the pattern, the code works forever, nothing is tracked, and no service can expire or paywall it. The trade-off is that the destination cannot be changed once printed. Dynamic codes point at a redirect service, which allows editing and scan analytics but stops working if that service disappears.

For printing, the practical rule of thumb is that the code should be at least one tenth of the expected scanning distance: 2–3 cm for something scanned at arm's length, and around 30 cm for a code read from three metres away. Always export at high resolution, keep a quiet zone of about four modules of empty space around the pattern, and never stretch the code non-proportionally.

Privacy and how this generator works

The code is generated entirely in your browser. The text you type — including Wi-Fi passwords and contact details — is never transmitted to a server, never logged and never stored. That matters, because many online QR services quietly route your code through their own domain so they can count scans.

Download the result as PNG for everyday use or SVG when you need infinitely scalable output for print. Because the code is static, it has no expiry date and no dependency on Nesake staying online.

Frequently asked questions