A QR code is just data printed as pixels — it cannot expire. What can stop working is the destination behind it: a dynamic QR code points at a redirect service that might shut down, and a plain link dies if the target page does. Codes you generate locally with plain content keep working forever.

Are QR codes safe to scan?

The code itself is inert; the risk is where a URL points. Attackers print codes that lead to phishing sites, so treat a decoded link like any unknown link — read it before opening. Using a scanner that shows you the destination first, instead of jumping straight to the browser, is the safe habit.

What is the difference between static and dynamic QR codes?

A static code encodes the final content directly — a URL, Wi-Fi credentials, text — and works forever. A dynamic code encodes a short redirect URL owned by the service that made it, letting the destination be changed later; it works only as long as that service exists, and it tracks every scan.

How much data can a QR code hold?

Up to about 4,300 characters in the largest version at the lowest error-correction level. The practical limit is much lower: every extra character adds modules, making the code denser and harder to scan — keep payloads short, especially for print.

O le a le QR Code?

O na paso faatafafa uliuli-ma-paʻepaʻe i luga o menus, pepa lautele ma pepa ulufale e mafai ona faʻapipiʻi se fesoʻotaʻiga, faʻamatalaga Wi-Fi poʻo se tiketi i ni nai senitimita sikuea. O le auala lenei latou te galulue ai - ma pe faʻafefea ona fatuina ma suʻesuʻe e aunoa ma le puʻeina.

Pixels e pei o faʻamatalaga

O se QR code - Fa'ailoga vave Tali, invented in 1994 by Denso Wave for tracking car parts — is a two-dimensional barcode. O le mea e teu ai e se supamaketi barcode se sefulu numera i le tasi itu, o le QR code e teu ai faʻamatalaga i totonu lua fua: o se faasologa o modules uliuli ma paʻepaʻe, taʻitasi ma sina mea itiiti. O le mafuaaga lena e mafai ai e le QR code ona taofia le faitau afe o mataitusi nai lo le sefulu numera.

O faʻamaumauga e mafai ona avea ma soʻo se mea e mafai ona faʻatusalia e bytes: o se URL, tusitusiga manino, faʻamatalaga faʻafesoʻotaʻi, faʻamatalaga Wi-Fi, e oʻo lava i faila faila i le teori. E faitau e le scanner le fa'asologa, toe fa'aleleia paita, ma fa'amatalaina.

Anatomy o se QR code

E tolu fa'ailoga va'aia e mafai ai ona fa'aogaina se QR code mai so'o se itu:

Elemene	O fea	Matafaioi
Su'e mamanu	O sikuea tulimanu tetele e tolu	Tuu atu i le scanner e su'e le code ma lona tulaga
Fa'asologa o mamanu	Laititi sikuea, pito i lalo taumatau	Fa'asa'o mo le fa'aletonu o tioata i luga o mea fa'api'opi'o
Fuafuaga taimi	Laina fesuia'i i le va o tagata su'e	Seti fa'amaopoopo fa'asologa o module
Sone filemu	paepae paepae faataamilo	Tuueseese le code mai lona si'osi'omaga - o se vaega o le tulaga masani, aua le fa'aotiina
Fa'amatalaga & faasa'oga sese	O isi mea uma	O le uta, fa'atasi ma le fa'aletonu

E 40 "faiga" - lapopoa mai le 21 × 21 i le 177 × 177 modules. O lomiga tetele o lo'o iai fa'amatalaga e tele; ose URL masani o lo'o tula'i ile version 3–5.

Aisea ua fa'aleagaina codes pea scan

QR code fa'apipi'i Reed–Solomon faasa'oga sese — o le matematika lava e tasi e puipuia ai CD ma su'esu'ega vateatea loloto. E oo atu i se vaega patino o modules ua faaleagaina, e toe fausia e le decoder faamatalaga o loo misi nai lo le toilalo. E fa tulaga tau fefa'ataua'iga mo le maufetuuna'i:

L - toe faʻaleleia ~ 7% faʻaleagaina; code sili ona mafiafia.
M — ~15%; le faaletonu i aso uma.
Q — ~ 25%; lelei mo lolomi o le a taulimaina.
H — ~30%; e mafai ai ona e sasaina se logo i le ogatotonu, e sao mai luga o le gaoa.

O le mea fo'i lea e talia ai e tulafono fa'alilolilo se fa'alava o le logo: a fa'apea e tumau pea le fa'aleagaina i lalo o le tala o le tupe toe fa'aleleia, e tumau pea le uta.

Static vs dynamic codes

A tumau O le QR code e fa'ailoga sa'o ai mea mulimuli. E aoga e fa'avavau, leai se tau, leai se mea e alu ai - sui le mea e alu i ai ma toe lolomi le code. A malosi code fa'ailoga se URL toe fa'afo'i pu'upu'u o lo'o umia e se auaunaga QR: o lo'o fa'amauina e le 'au'aunaga su'esu'ega uma ma e mafai ona toe fa'asino le taunu'uga mulimuli ane. Fa'aoga mo fa'aupuga, ae fa'aopoopoina le fa'alagolago (e tatau ona ola pea le tautua), su'esu'eina fa'alilolilo, ma e masani lava o se fa'asoa. O tatou QR generator e maua ai na'o tulafono laiti - e leai se mea e muta, leai se telefoni ile fale.

O mea e tuu e tagata i totonu

URLs - pepa lautele, kata pisinisi, afifiina.
Wi-Fi —le WIFI:S:name;T:WPA;P:password;; fa'apipi'i fa'atasi i se feso'ota'iga i le fa'ata'ita'iga; e fausia e le matou afi mo oe.
vCards - se kata faʻafesoʻotaʻi i se faʻataʻitaʻiga e tasi.
Imeli, telefoni, SMS — mua'i faatumuina le lau tusi.
Totogi ma tiketi - saini e tasi le taimi, o le mea lea e le tatau ai ona toe faʻaaogaina pe puʻeina e tagata ese na tulafono laiti.

Va'ai saogalemu (quishing)

Talu ai o se code ua naʻo se fesoʻotaʻiga e lolomi e se tasi, o loʻo faʻaaogaina foi e le au osofaʻi - o le metotia e iai sona igoa, quishing (QR phishing). O fasi pepa e sasa i luga o tulafono fa'aletulafono i luga o mita paka, fa'ailoga i imeli e o'o atu ai i itulau o le seleselega fa'amaonia: o le telefoni e tatalaina le mea e alu i ai ma le le iloa, ma o le tulaga lamatia lena.

Fa'aaoga se scanner lea fa'aalia le anotusi ua fa'avasega a'o le'i tatalaina - pei o le QR scanner i luga o lenei 'upega tafaʻilagi - nai lo se tasi e oso saʻo i le suʻega.
Faitau ma le faaeteete le vaega: paypa1.com e le o PayPal.
Ia atili masalosalo i tulafono laiti e taunuu mai ufiufi isi code, po'o le mana'omia le saini i le taimi lava e uma ai le su'ega.

Na maua se QR code o se ata? Fa'avasega e aunoa ma le fa'atuatuaina: o le QR faitau e fa'aalia ai mea mata'utia o so'o se ata, i le lotoifale, ae e te le'i tatalaina se mea.

Aoao atili

Fausia se tasi: le QR code generator (sootaga, Wi-Fi, imeli, SMS - PNG download).
Faitau ola se tasi: le QR scanner ma lau meapueata, po o le tagata faitau mo ata.
E fia iloa tuatusi ile QR so'oga? Amata i o le a le tuatusi IP.

FAQ

QR code fesili

E muta le aoga o QR code?

O le QR code ua na'o fa'amaumauga e lolomi e pei o pixels - e le mafai ona muta. O le a le mea e mafai ona taofia le galue o le taunuuga i tua atu: o se QR code faʻamalosi e faʻasino i se auaunaga toe faʻafeiloaʻi e ono tapunia, ma o se fesoʻotaʻiga manino e mate pe a fai e le itulau faʻatatau. O tulafono laiti e te fa'atupuina fa'apitonu'u ma fa'amatalaga manino o lo'o galue pea e fa'avavau.

E saogalemu QR code e su'e?

O le code lava ia e le aoga; o le tulaga lamatia o le mea e faasino i ai se URL. O lo'o lolomi e le au osofa'i tulafono e ta'ita'i atu ai i saite phishing, o lea ia fai se so'otaga fa'aliliu e pei o so'o se so'oga e le iloa - faitau i ai a'o le'i tatalaina. O le fa'aaogaina o se masini su'esu'e e fa'aali muamua ai le mea e alu i ai, nai lo le oso sa'o i le su'esu'ega, o le mausa saogalemu lea.

O le a le ese'esega i le va o code QR static ma dynamic?

O se fa'ailoga fa'amautu e fa'ailoga sa'o ai mea mulimuli - o se URL, fa'amatalaga Wi-Fi, tusitusiga - ma e galue e fa'avavau. O se fa'ailoga fa'amalosi e fa'apipi'i ai se URL toe fa'afo'i pupuu o lo'o umia e le 'au'aunaga na faia ai, fa'ataga le mea e fai e sui mulimuli ane; e na'o le umi lava e i ai lena auaunaga, ma e siaki uma su'esu'ega.

O le a le tele o fa'amatalaga e mafai ona taofia e le QR code?

E oʻo atu i le 4,300 mataitusi i le tele o faʻamatalaga i le pito sili ona maualalo o faʻasaʻoga sese. O le tapula'a fa'atino e sili atu le maualalo: o tagata fa'aopoopo uma e fa'aopoopoina fa'aoga, fa'apupulaina le fa'ailoga ma faigata ona su'esu'e - fa'apuupuu uta, aemaise lava mo le lolomi.