How To Generate Qr Codes
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What a QR code actually encodes
Generating a QR code takes ten seconds. Generating one that actually scans reliably on a menu, a business card, or a banner — that takes a minute of thought about what’s going inside the code, how big it’ll print, and where it’s going to live. Skip that minute and you’ll be the person whose conference badge nobody can scan. Here’s how to avoid it.
Shorten the URL first
A QR code is just a 2D barcode that stores text. Any text — a URL, a phone number, a Wi-Fi password, a plain sentence. The important bit: the more characters you encode, the denser the code becomes, and the harder it is to scan at small sizes or on curved surfaces. A 20-character short URL scans cleanly from across a room. A 200-character tracking URL with UTM parameters becomes a grid of microscopic dots.
Error correction levels
If you’re encoding a link, do yourself a favor and shorten it before generating. A Bitly link, a branded short domain, or a clean custom slug on your own site — all three keep the code sparse and scannable. There’s a second benefit: if the destination ever changes, a short URL redirects, but a QR code pointing at the long original is locked in forever on whatever printed material it’s on.
Minimum print size
QR codes have four redundancy levels: L (7%), M (15%), Q (25%), H (30%). Higher levels let the code survive damage — a smudge, a logo in the middle, a fold — but they also make the code denser for the same data.
Test from 2-3 phones
A reasonable baseline: at error correction M with a short URL (under 30 characters), 1 inch square prints reliably for scanning from 10-12 inches away. Longer URLs or higher error correction push that up. For a poster scanned from across a room, scale proportionally — the rule of thumb is the code should be about 1/10th of the viewing distance.
What breaks QR codes in the wild
Smaller is always riskier. If the code has to live on a business card, keep the URL genuinely short and test on real paper, not just on a screen.
One more habit
Before you print 500 of anything, scan the code with at least two different phones — ideally one iPhone, one Android, one older device. Scan from the distance and angle people will actually scan at. About 1 in 10 codes that look fine on screen fail on a real phone in real light. Finding that out after the print run is expensive.