Digital business cards: NFC, QR and scanning paper cards

What a digital business card is

A digital business card is your contact details packaged so that a phone can save them in one gesture. The details themselves are ordinary: name, title, company, phone, email, website, a photo, a short line about what you do. What makes the card digital is the carrier, the thing that gets those details from your hand to someone else's address book without retyping.

Phones have understood a standard contact format for a long time: vCard, the format behind a .vcf file. When a phone is handed a vCard, whether from a QR code, a file or a web page, it offers to save the contact. Every digital business card, whatever it is called, ends in a vCard landing in an address book. The rest of this page is about the different roads that lead there.

The three carriers: a link, a code, a tap

• A link opens a web page that shows the card and offers the contact to save. It travels anywhere text does: a message, an email signature, a social profile.
• A QR code is a link or a contact drawn as a pattern a camera reads. It works on paper, on a screen and on a sign, and it needs nothing but the camera app the phone already has.
• A tap uses NFC, a short-range radio in most recent phones. A card or sticker with a chip holds the link, and holding a phone against it opens the link.

The three are not rivals. The same card behind them is what matters; each carrier covers a situation the others cannot reach. A tap is the fastest across a table, a code works on a poster, and a link works on a video call.

NFC cards and stickers

An NFC business card is a plastic card, a sticker or a key fob with a small passive chip inside. The chip has no battery: it is powered by the phone's own radio field when the phone comes within a few centimetres, which is why a tap has to be a touch and not a wave across a room.

The chip stores one short record in a standard format called NDEF, and on a business card that record is almost always a web address. The chip does not hold your name, your number or your photo. It holds the link, and the link opens the card. That has a useful consequence: when your details change, you edit the card and the chip needs nothing. Only the link is written on it, and the link stays the same.

Blank tags are sold in the common chip families NTAG213, NTAG215 and NTAG216, which differ mainly in how much they store; a short link fits on all of them. A phone writes the record with a tag-writing app, and the tag can be rewritten later unless it is deliberately locked.

What happens on a tap

On an iPhone that reads tags in the background (iPhone XS and later), holding the top edge of the phone near the tag shows a notification, and tapping the notification opens the link in Safari. On Android, NFC has to be switched on and the phone unlocked; the link then opens in the default browser. Neither side installs anything, because the link is an ordinary web page.

A tap cannot reach a phone across a table, through metal or through a thick case, and it does nothing on a phone with NFC switched off or without NFC at all. A tap opens a link; on its own it does not write a contact into the address book, it cannot be shown on a video call, and it cannot sit in an email signature. Those are the gaps the code and the link fill.

QR codes: a link or the contact itself

A QR code can carry two different things on a business card, and the choice changes what a camera does with it.

• A link QR holds a web address. The camera opens the page, which shows the card and offers the contact to save. The page can change; the printed code keeps working as long as the link does.
• A vCard QR holds the contact record itself, in the same vCard format phones save from a file. The camera offers Save contact straight away, with no page and no network. It works with no signal, and it never changes, because the details are in the pattern.

A code grows denser as it carries more. A short link makes a coarse code that reads from a distance; a full vCard with an address and a note makes a fine one that wants a closer, steadier read. Photos and logos do not fit in a QR code at all, which is why a contact code carries text and the photo lives on the card page instead.

Printing a QR code that scans

• Keep the quiet zone: the QR standard requires a blank margin around the code, and artwork that crowds it breaks the read.
• Dark modules on a light background. Inverted and low-contrast codes fail on many cameras.
• Size the code for the reading distance. A card in the hand is read up close; a banner is read from a step back and needs a much larger code.
• Error correction lets a reader recover a partly damaged code, but a logo dropped over the middle spends that margin. If you add one, test the printed proof with a real phone before the run.
• Print from a sharp image. A code that was screenshotted and enlarged has soft edges that a camera has to guess at.

Digital cards: what they carry and where they live

A card page carries the same details a vCard does, plus what a vCard cannot hold well: a photo, a logo, a colour, a short introduction, links that open. Where those details are stored differs from product to product, and it is worth knowing before you choose one.

Some services keep every card on their servers, under an account, and the link points at that copy. The card then depends on the account staying open. Others keep the card on the device and carry the details inside the link itself, so there is no server copy and nothing to lapse. OvniCard is the second kind: your cards and the contacts you collect live in your own phone's storage, a shared card travels inside its link, and the photo and logo stay on your device rather than travelling with it.

Keeping a card up to date

Which carrier you print decides what an edit costs you later.

• An NFC tag holds a link, so editing the card changes nothing on the tag.
• A link QR holds a link, so it keeps working after an edit too.
• A vCard QR holds the details themselves. A new phone number means a new code and a reprint.

Many people print the contact code on paper for the one-gesture save, and rely on the link and the tap for everything that might change. If your details change often, print the link.

Scanning paper cards into contacts

Paper cards are not going away, and the useful half of a digital card is what happens to the ones you receive. A card scanner photographs a paper card and reads the print into a contact using optical character recognition, the same technology that turns a scanned page into text. The fields it finds, name, company, phone, email, address, are placed into a contact you can check and save.

Two things separate a scanner you can trust from one you cannot. Where the reading happens: on the device, so the photo of someone's card is not sent anywhere, or on a server, which is faster on old phones but means the card leaves your hand. And what it does when the print is hard to read: guesses silently, or tells you. OvniCard reads on your device by default, keeps the original photo with the contact so you can always check the source, and offers an optional cloud reader that stays off until you switch it on; the privacy page lists what that reader sends.

When the scanner is not sure

Print is read by a machine with a confidence, not a certainty. A stylised font, a dark background, a photo taken at an angle or a glossy card under a lamp all lower it. A good scanner surfaces that: a field it is unsure about is flagged for you to check instead of being written into your address book as fact. OvniCard highlights those fields in the contact.

One card per photo is the other rule. Two cards overlapping in one frame cannot be read honestly, because the reader cannot tell whose number is whose; OvniCard refuses that photo and offers a one-tap crop to a single card. Whatever you collect exports as .vcf, the format every address book speaks, so nothing you scanned is locked in.

Sharing from a phone

• Show the QR code on your screen and let the other person's camera read it. This is the everyday move: no tap hardware, no typing, and it works between any two phones with a camera.
• Send the link in a text or an email. It opens in their browser, and the card page offers the contact to save.
• Put the QR image on your lock screen, so the card is one button away when someone says show me.
• Add the QR image and the plain link to your email signature. The image serves phones, the link serves people reading on a desktop.
• Attach the .vcf file where a file is what is wanted, such as a form or a shared folder.
• Hand over a paper card with the code printed on the back, so the card you give away saves itself.

Whoever receives the card needs nothing but the phone they already own. The camera reads the code; the browser opens the link; the address book saves the vCard.

Choosing by situation

• Across a table: a tap, if you have an NFC card and they have NFC on; otherwise the QR on your screen.
• At a booth or a counter: a printed QR on a sign, large enough for the distance, with the link written under it.
• On a video call: the link in the chat, or the QR held up to the camera.
• In an email: the QR image plus the plain link.
• With someone who hands you a paper card: scan it, check the flagged fields, save.
• With no signal: the vCard QR, because the details are in the code and no page has to load.

What none of this does

A digital card does not make someone remember you; it removes the retyping. A tap does not work on a phone without NFC, a code does not work without a camera, and a link does not work without a browser, which is why a card worth carrying offers all three. No carrier writes into a stranger's address book without their consent: the phone always asks before saving, on every platform, and that is a feature.

Be wary of claims that need an account on both sides. If the other person has to install something or sign up to receive your details, the card has stopped being a card and become a subscription for them too.

Where OvniCard stands

Today OvniCard makes the card, the link, the link QR and the vCard QR on your phone, from the details you type, and reads paper cards into contacts on your device. It runs in the browser from a link; adding it to your home screen is optional. Nothing is uploaded to make a card, and nothing on this site cites a user count, a rating or a price that is not real.

NFC is not in the web app, because browsers on iPhone cannot write tags. The iPhone app, coming to the App Store, writes your OvniCard link to a tag you hold the phone to and reads tags the same way. Until it ships there is no store badge, no pre-order and no chip in a box on this site. The link and the QR work on every phone with a camera or a browser, which is every phone.