QR Generator Online
Ayuda y Preguntas

Preguntas Frecuentes sobre Creación y Escaneo de Códigos QR

Encuentra respuestas fiables sobre caducidad de códigos QR, resolución de impresión, corrección de errores y personalización de logo.

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Frequently Asked Questions & Technical Advice

Do static QR codes expire? No, static QR codes created on QR Generator Online contain raw data and will never expire as long as your destination link remains active.

What is the best format for print? Vector SVG is the recommended format for commercial printing as it scales to any physical dimension without pixelation or quality loss.

Arquitectura Técnica y Protocolo

The Master Technical & Practical FAQ for Optical 2D Barcodes

This is the QR Generator Online knowledge base — the place to settle a technical, design, prepress, or security question about the 2D matrix barcodes defined by ISO/IEC 18004.

The answers here cover the whole span: the maths behind Reed-Solomon error correction, how a phone camera turns a photo into data, the distance-to-size ratio you print by ($S = D / 10$), and where GDPR and CCPA touch a QR workflow. Developers, marketing leads, prepress technicians, and business owners all end up needing different pieces of it.

The categories below are sorted so you can jump straight to creating, styling, printing, or deploying a code.

Technical Summary of QR Code Symbology Standards

Technical ParameterStandard SpecificationEngineering Recommendation
Governing Standard ISO/IEC 18004:2015 (Information Technology) Strict adherence for universal optical decoding
Error Correction Levels Level L (7%), Level M (15%), Level Q (25%), Level H (30%) Level H for logo embeds; Level M for clean URLs
Quiet Zone Margin Minimum 4 module widths on all 4 sides Mandatory for scanner boundary edge-detection
Optical Sizing Formula S = D / 10 (Width = Scan Distance / 10) Minimum 25 mm x 25 mm for handheld print media
WCAG Contrast Ratio Minimum 4.5:1 luminance contrast (7:1 for outdoors) Dark foreground modules on light background canvas
Maximum Data Capacity 4,296 alphanumeric / 7,089 numeric / 2,953 bytes Keep under 150 characters for rapid camera decoding

Cómo Obtener una Respuesta Rápido

1

Select Data Payload Schema

Start from what you are encoding — URL, vCard 3.0, WiFi, WhatsApp, SMS, email, phone, location, event, crypto, plain text, or a Google Form.

2

Configure Styling & Error Correction

Set brand colours that stay above 4.5:1 contrast, choose a dot style, and if a logo is going in the middle, generate at Level H.

3

Export Vector SVG & Test Physical Proofs

Download the vector SVG or 4K PNG, then scan it on a few different phones under different lighting before it goes anywhere.

Temas que Cubre este Centro de Ayuda

Comprehensive Technical Coverage

The error-correction maths, the URI protocols, and how camera binarization actually works — explained rather than glossed over.

Practical Prepress & Printing Guidance

Real sizing formulas, which substrate to pick, and how to compensate for ink dot gain on press.

Security & Quishing Defense Strategies

What to do so a tampered or spoofed code cannot turn your campaign into a phishing vector.

100% Free & Open-Access Knowledge Base

Open documentation that stays put — no login, no paywall, whether you are a developer or a marketer.

QR Code Resolution & Print Sizing Guide

Quick reference guide for determining physical print dimensions based on user viewing distance.

Placement / ApplicationExpected Scan DistanceMinimum Width (S)Recommended Error Correction
Business Cards & Name Tags 15 cm - 30 cm (6" - 12") 25 mm x 25 mm (1.0" x 1.0") Level Q (25%) or Level H (30%)
Table Tents & Coasters 30 cm - 50 cm (12" - 20") 35 mm x 35 mm (1.4" x 1.4") Level M (15%) or Level H (30%)
Product Packaging & Labels 20 cm - 40 cm (8" - 16") 30 mm x 30 mm (1.2" x 1.2") Level H (30%) with center logo
Flyers, Posters & Magazines 50 cm - 150 cm (20" - 60") 60 mm - 150 mm (2.4" - 6.0") Level M (15%)
Vehicle Fleet Graphics 3.0 m - 6.0 m (10 ft - 20 ft) 300 mm x 300 mm (12" x 12") Level H (30%) on cast vinyl
Highway Billboards 15.0 m - 30.0 m (50 ft - 100 ft) 1500 mm - 3000 mm (5 ft - 10 ft) Level L (7%) or Level M (15%)

Situaciones Comunes que Nos Consultan

  • 1

    Enterprise IT & Security Compliance

    Check that a corporate QR rollout lines up with GDPR, CCPA, and ISO data-sovereignty rules before it ships.

  • 2

    Packaging Design & Flexographic Prepress

    Confirm a barcode die-line clears ISO/IEC 18004 contrast and quiet-zone limits before the plates get made.

  • 3

    Hospitality & Restaurant Chains

    Roll out contactless menus and guest WiFi cards that need no staff to explain them.

  • 4

    Event Organizers & Conference Coordinators

    Speed up check-in, hand out speaker slide downloads, and drop sessions into attendees' calendars.

  • 5

    Real Estate Brokerages & Marketing Teams

    Turn a yard sign into a round-the-clock lead source that opens a 3D virtual tour.

Top 5 Most Common QR Code Failures & How to Fix Them

  • Weak contrast. Pale modules on a pale background give the camera nothing to lock onto. Stay at 4.5:1 or higher.
  • A clipped quiet zone. Trim the margin too close and the scanner can no longer find where the code begins. Keep the full 4-module border.
  • A 72 DPI screenshot. Low-res web graphics blur at the module edges in print. Supply vector SVG or a 300+ DPI raster instead.
  • Too much data. A long URL packs the matrix with tiny dots that smear when printed small. Shorten the link before you generate.
  • Glossy lamination. A high-gloss coat throws spotlights back into the lens. Ask for matte or satin.

Preguntas Frecuentes

Todo lo que desarrolladores, especialistas en marketing y empresarios necesitan saber.

What is the difference between a static and a dynamic QR Code?
A static code carries the actual data — the URL, vCard, WiFi string, whatever it is — inside the matrix. Nothing to expire, no server to depend on. A dynamic code carries a redirect that points at someone else's server, which lets you edit the destination later but ties you to a subscription to keep the redirect alive.
Do QR codes created on QR Generator Online ever expire?
They stay valid for life. Unlimited scans, no recurring fee, no timer counting down — the code is self-contained.
What is the minimum physical size a QR code can be printed?
For a short URL read from 15-20 cm away, 20 mm x 20 mm (0.8" x 0.8") is the floor. On packaging and business cards, treat 25 mm x 25 mm (1.0" x 1.0") as the safe industry minimum.
How does Error Correction Level H protect my QR code with a logo?
Level H duplicates roughly 30% of the payload through Reed-Solomon redundancy. That spare copy is what lets a logo sit over the centre modules — the scanner reconstructs the covered data from the redundant bits.
Can I customize QR code colors to match my brand identity?
You can recolour the modules, the background, the corner frames, and the corner dots independently. One rule governs all of it: dark against light needs to clear 4.5:1 contrast, or scanners start to struggle.
Why is SVG format recommended over PNG for commercial printing?
SVG describes the code as geometry, not pixels. Enlarge it from a business card to a billboard and the edges stay razor-sharp, because there is no pixel grid to run out of.
Are QR codes safe from malware and phishing ("quishing")?
The code itself only holds text or a URL — it cannot carry malware. The risk is a spoofed code pointing somewhere it should not. Guard against it by showing your verified logo in the centre and printing the real destination domain in plain text beside the code.
Is my personal data stored or tracked on QR Generator Online servers?
It is not. Everything runs client-side in browser memory. Your links, passwords, contact cards, and uploaded logos are never sent to a server or kept anywhere.

Lista de Verificación de Solución de Problemas

Hold contrast above 4.5:1, protect the 4-module quiet zone, and export vector SVG for print. Then scan a physical proof before the volume run — that final check is what separates a clean launch from a reprint.

Los 22 Generadores de Código QR

Explora los 22 generadores especializados de código QR para convertir sitios web, WiFi, vCards, documentos, redes sociales, enlaces de pago y ubicaciones en códigos escaneables.

URL

Redirigir a un enlace web existente

Documento PDF

Vincula o sube un menú, folleto o catálogo en PDF

Texto Plano

Codifica texto plano en un código QR

Contacto

Comparte información de contacto al instante

WiFi

Comparte credenciales WiFi mediante código QR

Correo

Crea un código QR de correo prellenado

SMS

Crea un código QR de SMS prellenado

Teléfono

Realiza una llamada con un solo escaneo

WhatsApp

Inicia una conversación de WhatsApp

Social

Enlaza a tu perfil de redes sociales

Ubicación

Comparte una ubicación en el mapa

Evento

Crea un código QR de evento de calendario

Cripto

Comparte una dirección de pago en criptomonedas

Google Forms

Enlaza a una encuesta de Google Forms

Instagram

Comparte tu perfil de Instagram

YouTube

Enlaza a tu canal o video de YouTube

LinkedIn

Comparte tu perfil de LinkedIn

Twitter / X

Comparte tu perfil de Twitter/X

TikTok

Comparte tu perfil de TikTok

Telegram

Comparte tu perfil o grupo de Telegram

PayPal

Acepta pagos de PayPal mediante código QR

UPI

Acepta pagos UPI (India)

Plataforma con la Privacidad Primero: los códigos QR estáticos se generan 100% localmente en tu navegador. Las campañas dinámicas se gestionan de forma segura con enrutamiento cifrado.

Seguro · Global · Rápido  —  Con la confianza de miles de usuarios. No necesitas cuenta.

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