What QR Codes Are and How to Create One
QR codes are those little black-and-white squares printed on menus, posters, packages, and payment terminals. Point a phone camera at one and it instantly opens a link, shows text, or starts a payment. Here is what they really are — and how to make your own in seconds.
What a QR code actually is
A QR ("Quick Response") code is a two-dimensional barcode. Where a traditional barcode stores a dozen or so digits in a row of lines, a QR code stores data in a grid of squares that can be read from any angle. That grid can hold a few thousand characters: a URL, a block of text, contact details, Wi-Fi credentials, and more.
The pattern includes built-in error correction, so a code still scans even if part of it is smudged, covered by a logo, or printed small. That redundancy is why QR codes are so reliable in the messy real world.
What you can put in one
- A link — by far the most common use. The code encodes a URL and the camera
opens it.
- Plain text — a note, a coupon code, a serial number.
- Contact info — so someone can save your details with one scan.
- Wi-Fi login — guests join your network without typing the password.
If your data is a URL with query parameters, encode those parameters cleanly first with the URL encoder so special characters survive the trip.
How to create one
- Open the QR code generator.
- Paste your link or type your text.
- The code updates live as you type.
- Download the image and drop it into your design, slide, or print file.
That is the whole workflow — no account, no watermark.
Tips for codes that always scan
- Keep good contrast. Dark code on a light background scans best; avoid
low-contrast color pairs.
- Leave a quiet zone. The empty margin around the code is part of the spec —
do not crop it away.
- Do not print too small. As a rule, aim for at least 2 × 2 cm for a code
scanned at arm's length, larger for posters.
- Test before you publish. Scan the final artwork with a couple of different
phones.
Generated entirely in your browser
The QR code generator builds the image locally with JavaScript — your link or text is never uploaded to a server. That matters when the code points to a private document, an internal tool, or an unreleased campaign URL: the data stays on your machine, and you can even generate codes offline once the page has loaded.