What Are QR Codes, and How Do They Work?

Regan Black
|
July 3, 2025
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QR codes are everywhere, from restaurant tables to event check-ins. You've probably scanned one without even thinking twice. They're fast, easy, and incredibly versatile.

At GuestCam, we use QR codes to simplify event guest photo sharing at weddings, parties, and corporate gatherings. But what exactly is a QR code, and how does it work? This post breaks it all down, from the basics to real-world uses like event photo sharing and easily receiving payments.

What Is a QR Code?

A QR code (short for "Quick Response" code) is a two-dimensional barcode that holds much more information than the traditional kind you’d find on a cereal box. It was invented in 1994 by a Japanese company called Denso Wave to help track parts in car manufacturing.

Unlike 1D barcodes that store data horizontally, QR codes store it both vertically and horizontally. That’s why they can hold URLs, contact info, and even Wi-Fi credentials - all in one tiny square. If you’ve ever scanned a GuestCam QR code to upload event photos (or view an event gallery), you’ve already used this tech in action.

How Do QR Codes Work?

QR codes are made up of tiny squares arranged in a square grid. When you scan one using your phone's camera or a QR scanning app, your device decodes the pattern into something useful, like a link or a contact card.

Structure of a QR Code

  • Positioning patterns: The three large squares in the corners help your phone figure out the orientation.
  • Alignment patterns: Smaller squares that ensure the code is readable, even on curved or uneven surfaces.
  • Timing patterns: These help define the grid so the device knows how to read the code.
  • Data modules: The black and white squares that actually contain your data.
  • Error correction: QR codes have built-in redundancy so they still work even if a portion is damaged or blurry.

What Can They Store?

QR codes can store different types of information:

  • URLs (like to an event gallery)
  • Plain text
  • Contact details (vCard)
  • Wi-Fi credentials
  • App deep links
  • Event check-in or photo-sharing links (like what GuestCam uses)

Static vs. Dynamic QR Codes: What’s the Difference?

There are two main kinds of QR codes - static and dynamic.

Static QR Codes

Once created, these codes are locked. You can’t change the destination or content later. Great for simple, one-off use cases.

Dynamic QR Codes

These can be edited later and offer tracking. For example, a museum exhibit might use a dynamic QR code to link visitors to a digital guide. If the exhibit content changes or expands, the QR code can still be used - the destination link is simply updated behind the scenes without having to print a new code.

Popular QR Code Uses in Real Life

QR codes have moved way beyond just tech or retail. Here’s where they’re commonly used, including how we use them at GuestCam.

Events Ticketing & Photo Sharing

QR Code table sign to collect event pictures
QR Code Table Sign to Collect Event Pictures

This is where QR codes really shine. Whether you're hosting a wedding, birthday party, or corporate retreat, QR codes make it effortless for guests to upload and view photos. With just one scan, they’re taken to a branded gallery where they can instantly share pictures - no app, no sign-ups, no hassle.

One of the most popular and effective use cases in the events space is using a QR code for wedding pictures. Weddings are full of excitement and movement, with guests snapping photos from all angles. Placing a QR code on signage or table cards makes it easy for everyone to contribute their shots to a shared online album for the event.

You get all the guest-taken photos & videos in one place, without having to chase people down later or dig through messages.

It's one of the simplest ways to ensure every memory, big or small, gets captured and collected.

Marketing & Advertising

QR codes are everywhere in ads, posters, and packaging. Brands use them to drive traffic to websites, social campaigns, and product pages.

Payments & E-commerce

You’ve probably paid for something using a QR code. Apps like PayPal and Venmo let you scan to send or receive money. It’s fast and doesn’t require physical contact.

Healthcare

Hospitals and clinics use QR codes to manage prescriptions, patient records, and appointment confirmations.

Restaurants & Hospitality

You’ve likely scanned a QR code to view a menu or order food. It’s quick, contactless, and removes the need for physical menus.

Education

Teachers use QR codes to link to quizzes, study guides, or homework assignments. It saves time and paper.

Are QR Codes Safe? Tips for Secure Scanning

While QR codes are convenient, they can be misused. Malicious codes can send users to phishing websites or initiate sketchy downloads.

Here’s how to stay safe:

  • Stick to scanning codes from trusted sources.
  • Use your phone’s default camera or a reputable QR scanning app.
  • Preview the URL (many phones show a preview) before tapping to open it.

At GuestCam, we generate secure, branded QR codes so your guests always know they’re in the right place.

How to Create a QR Code in Minutes

There are plenty of tools online that let you generate a QR code in seconds.

How To Do It:

  1. Pick the type of content (URL, text, Wi-Fi, etc.)
  2. Add your content
  3. Customize the design if you want (colors, logo, etc.)
  4. Download the code and test it

Popular tools include QR Code Monkey, Canva, and Flowcode. For business or event use, look for platforms that offer analytics and editing options. If you need a simple Link QR Code generator that doesn't required signup, and doesn't expire, checkout our free QR Code generator.

If you’re using GuestCam to collect & share event photos, we generate the QR code for you, optimized for your event. You just print it or display it digitally, and guests do the rest.

The Future of QR Codes

QR code adoption skyrocketed during the pandemic, and it’s only growing.

  • AR and smart packaging are adding layers of interactivity.
  • More venues are integrating QR-based check-in and photo sharing.
  • Digital IDs and authentication systems are going QR.

We see this first-hand at GuestCam. More couples and event organizers are looking for touch-free, simple solutions that still feel fun and personalized, and QR codes make that possible.

Conclusion: Why QR Codes Matter More Than Ever

QR codes are more than just techy squares. They’re a bridge between the real world and the digital one. At GuestCam, they help guests instantly upload event photos, connect with galleries, and share memories without needing to download an app or jump through hoops.

Whether you're planning a wedding, hosting a team offsite, or just looking to simplify your workflows, QR codes are worth embracing.

Planning a special event?

Make your event unforgettable—let guests share their photos and so much more with GuestCam.

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