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.

Khoutu ea QR ke Eng?

Lipapali tseo tsa lisekoere tse ntšo le tse tšoeu tse holim'a menyetla, liphoustara le li-passing tsa ho palama li ka paka sehokelo, mangolo-tsoibila a Wi-Fi kapa tekete ea lisekoere-mithara tse seng kae. Mona ke kamoo li sebetsang kateng - le mokhoa oa ho li theha le ho li hlahloba ntle le ho ts'oaroa.

Pixels joalo ka data

QR khoutu - Khoutu ea Karabelo e potlakileng, e qapiloeng ka 1994 ke Denso Wave bakeng sa ho sala morao likarolo tsa koloi - ke barcode ea mahlakore a mabeli. Moo barcode ea khale ea supermarket e boloka linomoro tse leshome le metso e 'meli boemong bo le bong, khoutu ea QR e boloka data ho eona tse pedi dimensions: grid ea li-module tse ntšo le tse tšoeu, e 'ngoe le e 'ngoe hanyenyane. Ke ka lebaka leo khoutu ea QR e ka bolokang litlhaku tse likete ho fapana le linomoro tse leshome le metso e 'meli.

Lintlha e ka ba eng kapa eng ea li-byte tse ka emelang: URL, mongolo o hlakileng, lintlha tsa puisano, lintlha tsa Wi-Fi, esita le lifaele tsa binary ka mohopolo. Sekena se bala marang-rang, se hlophisa li-byte bocha, ebe oa li hlalosa.

Anatomy ea khoutu ea QR

Lits'oants'o tse tharo tse bonoang li etsa hore khoutu ea QR e khonehe ho tloha lehlakoreng lefe kapa lefe:

Element	Hokae	Karolo
Mekhoa ea ho fumana	Likhutlo tse tharo tse kholo	Lumella sekena hore se fumane khoutu le mokhoa oa eona
Mokhoa oa ho tsamaisana	Sebaka se senyenyane, tlase-le letona	E lokisa bakeng sa ho sothofala ha lense libakeng tse kobehileng
Mokhoa oa nako	Moeli o fapanyetsanang pakeng tsa ba fumaneng	E beha likhokahano tsa grid ea module
Sebaka se khutsitseng	Moeli o mosoeu ka hohle	E arola khoutu ho tikoloho ea eona - karolo ea maemo, u se ke oa e jara
Lintlha le tokiso ea liphoso	Tse ding tsohle	Boima ba moputso, bo kena-kenana le khaello ea mosebetsi

Ho na le "liphetolelo" tse 40 - boholo ho tloha ho 21x21 ho isa ho 177x177 modules. Liphetolelo tse kholo li boloka lintlha tse ngata; URL e tloaelehileng e fihla ho mofuta oa 3–5.

Hobaneng ha likhoutu tse senyehileng li ntse li skena

Khoutu ea QR e kenyelelitsoe Reed–Solomone tokiso ea phoso - tsona lipalo tse sireletsang li-CD le li-deep-space probes. Ho fihlela karolo e itseng ea li-module tse senyehileng, decoder e tsosolosa data e sieo ho e-na le ho hlōleha. Maemo a mane a matla a khoebo bakeng sa ho mamella:

L - hlaphoheloa ~ 7% tšenyo; khouto e teteaneng.
M - ~ 15%; maemo a letsatsi le letsatsi.
Q - 25%; e ntle bakeng sa khatiso e tla sebetsoa.
H - ~ 30%; e o lumella ho otla lets'oao bohareng, o pholoha libaka tse mahoashe.

Ke ka lebaka leo likhoutu li mamellang ho koaheloa ha logo: ha feela ts'enyehelo e ntse e le ka tlase ho tekanyetso ea ho khutlisa, moputso o ntse o phela.

Static vs dynamic codes

A e tsitsitseng Khoutu ea QR e kenyelletsa litaba tsa ho qetela ka kotloloho. E sebetsa ka ho sa feleng, ha e lefelle letho, ha e latele letho - fetola sebaka seo u eang ho sona ebe u hatisa khoutu hape. A mahlahahlaha Khoutu e kenyelletsa URL e khuts'oane e lebisang hape sebakeng se seng sa ts'ebeletso ea QR: ts'ebeletso e boloka sekhechana se seng le se seng 'me e ka supa moo e eang teng hamorao. E na le thuso bakeng sa matšolo, empa e eketsa ho its'etleha (tšebeletso e tlameha ho lula e phela), ho lekola lekunutu, 'me hangata ho ngolisoa. Tsa rona QR jenereithara e hlahisa feela likhoutu tse sa fetoheng - ha ho letho le felloang ke nako, ha ho na lifono lapeng.

Seo batho ba se kenyang ka hare

Li-URL - li-poster, likarete tsa khoebo, liphutheloana.
WiFi - the WIFI:S:name;T:WPA;P:password;; sebopeho se kopanya marang-rang ho scan; jenereithara ea rona e u etsetsa eona.
li-vCards — karete ea ho ikopanya le motho e mong scan.
E-mail, fono, SMS — e tlatsa skrineng sa ho ngola esale pele.
Litefo le litekete - mesaeno ea nako e le 'ngoe, ke ka lebaka leo likhoutu li sa tlamehang ho sebelisoa hape kapa ho nkuoa lifoto ke batho bao u sa ba tsebeng.

Ho hlahloba ka mokhoa o sireletsehileng (quishing)

Hobane khoutu ke sehokelo sa motho ea hatisitsoeng, bahlaseli le bona ba e sebelisa - mokhoa ona o bile o na le lebitso, quishing (QR phishing). Li-stickers li otla ka holim'a likhoutu tse molaong tsa limithara tsa ho paka makoloi, likhoutu ho li-imeile tse lebisang maqepheng a kotulo ea mangolo-tsoibila: mohala o bula moo o eang teng o sa bonahale, 'me ke kotsi eo.

Sebelisa scanner hore e bontsha dikahare tse hlakotsweng pele di bula - joalo ka QR scanner sebakeng sena sa marang-rang - sebakeng sa e tlolelang ka kotloloho ho sebatli.
Bala domain name ka hloko: paypa1.com ha se PayPal.
E-ba le pelaelo e kholo ea likhoutu tse fihlang kwahelang likhoutu tse ling, kapa tse hlokang ho kena hang ka mor'a ho hlahloba.

Na u fumane khoutu ea QR joalo ka setšoantšo? E hlaole ntle le ho e tšepa: the 'mali oa QR e bonts'a litaba tse tala tsa setšoantšo leha e le sefe, sebakeng sa heno, pele u bula eng kapa eng.

Ithute haholoanyane

Etsa e 'ngoe: the QR code jenereithara (lihokelo, Wi-Fi, imeile, SMS — download PNG).
Bala e 'ngoe u phela: the QR scanner ka khamera ea hau, kapa mmadi bakeng sa litšoantšo.
U batla ho tseba ka liaterese tse ka har'a lihokelo tsa QR? Qala ka hore na aterese ea IP ke eng.

FAQ

Lipotso tsa khoutu ea QR

Na likhoutu tsa QR li felloa ke nako?

Khoutu ea QR ke data e hatisitsoeng joalo ka lipikselse - e ke ke ea felloa ke nako. Se ka emisang ho sebetsa ke sebaka se ka morao ho eona: lintlha tse matla tsa khoutu ea QR ts'ebeletso e tsamaisang sebaka e ka 'nang ea koaloa,' me sehokelo se hlakileng sea shoa haeba leqephe leo u le batlang. Likhoutu tseo u li hlahisang sebakeng sa heno ka litaba tse hlakileng li lula li sebetsa ka ho sa feleng.

Na likhoutu tsa QR li bolokehile ho skena?

Khoutu ka boeona e inert; kotsi ke moo URL e supang teng. Bahlaseli ba hatisa likhoutu tse lebisang litsing tsa phishing, kahoo tšoara sehokelo se seng se sa tsejoe joalo ka sehokelo sefe kapa sefe se sa tsejoeng - se bale pele u bula. Ho sebelisa seskena se u bonts'ang moo u eang pele, ho e-na le ho qhomela ho sebatli, ke mokhoa o bolokehileng.

Phapano ke efe lipakeng tsa likhoutu tsa QR tse tsitsitseng le tse matla?

Khoutu e tsitsitseng e kenyelletsa litaba tsa ho qetela ka kotloloho - URL, mangolo-tsoibila a Wi-Fi, mongolo - mme e sebetsa ka ho sa feleng. Khoutu e feto-fetohang e kenyelletsa URL e khuts'oane ea ho tsamaisa bocha, e leng tšebeletso e e entseng, e lumellang hore sebaka se fetoloe hamorao; e sebetsa feela ha feela ts'ebeletso eo e ntse e le teng, 'me e latela sekeno se seng le se seng.

QR code e ka tšoara data e kae?

Ho fihla ho litlhaku tse ka bang 4,300 phetolelong e kholo ka ho fetisisa boemong bo tlase ba ho lokisa liphoso. Moeli o sebetsang o tlase haholo: tlhaku e 'ngoe le e' ngoe e eketsehileng e eketsa li-module, e etsa hore khoutu e be matla le ho feta ho e hlahloba - boloka meputso e le khutšoanyane, haholo-holo bakeng sa khatiso.