QR Code Generator

Qué admite este generador de códigos QR

¿Qué es un código QR?

A QR (Quick Response) Code is a two-dimensional matrix barcode composed of black modules arranged in a square pattern. Unlike 1D linear barcodes, QR codes encode data both horizontally and vertically, enabling higher capacity and fast omni-directional scanning. Modern smartphones decode QR codes using the device camera and on-device algorithms, making them a universal bridge between physical and digital experiences.

Cómo funciona la codificación de códigos QR

• Selección de modo: The input string is segmented into optimal encoding modes (numeric, alphanumeric, byte, Kanji) to minimize symbol size.
• Codificación de datos: Segments are converted to bit streams with mode indicators and length fields.
• Bloques de corrección de errores: Reed–Solomon ECC codewords are generated and interleaved, enabling recovery from physical damage or occlusion.
• Construcción de la matriz: Finder patterns, timing patterns, alignment patterns, format & version info are placed, then data/ECC bits are mapped.
• Evaluación de máscara: One of 8 masks is applied; the one yielding the lowest penalty score (best visual balance) is chosen.
• Renderizado de salida: Modules are rasterized to a pixel grid (PNG here) with optional quiet zone.

Entendiendo la corrección de errores (niveles ECC)

QR codes use Reed–Solomon error correction. Higher levels allow successful decoding even if a portion is obscured, but increase symbol density.

Directrices de tamaño e impresión

• Tamaño físico mínimo: For business cards: ≥ 20 mm. Posters: scale so smallest module ≥ 0.4 mm.
• Regla de distancia de escaneo: A practical heuristic is Distance ÷ 10 ≈ minimum code width (in the same units).
• Quiet Zone: Maintain at least 4 modules of clear margin (we expose this as "Quiet zone").
• High Contrast: Dark foreground (near black) on white background yields best results.
• Vector vs Raster: PNG at sufficient resolution is fine for most print up to moderate sizes; for large signage prefer SVG (not provided here) or render with a large module size then downscale.

Consideraciones de diseño y marca

• Evitar la sobreestilización: Rounding or removing too many modules reduces decodability.
• Colocación del logotipo: Keep logos within the central 20–30% and raise ECC if overlaying.
• No alteres los patrones finder: The three large corner squares are critical for detection speed.
• Elección de colores: Light foreground or inverted schemes reduce contrast and scanner success rates.

Mejores prácticas de implementación

• Prueba en varios dispositivos: iOS & Android camera apps + third-party scanners.
• Acortar URLs: Use a reputable short domain to reduce version (size) and increase scan speed.
• Evita cadenas frágiles de redirección: Keep landing pages stable; broken URLs waste printed materials.
• Rastrea de forma responsable: If analytics needed, use privacy-respecting, minimal redirects.
• Ajuste al entorno: Ensure adequate lighting and contrast where the code is displayed.

Aplicaciones comunes de los códigos QR

• Marketing y campañas: Direct users to landing pages or promotions.
• Envasado y trazabilidad: Provide batch, origin, or authenticity info.
• Registro de eventos: Encode ticket or attendee IDs.
• Pagos: Static or dynamic invoice links in regions supporting QR payment standards.
• Acceso Wi‑Fi: Simplify guest onboarding without sharing passwords verbally.
• Menús digitales: Reduce printing costs and enable rapid updates.

Notas sobre privacidad y seguridad

• Procesamiento local: This tool never uploads your content; generation happens in-browser.
• Enlaces maliciosos: Always inspect destination domains before widespread distribution.
• Dinámico vs Estático: This generator produces static codes (data embedded) – resistant to third-party tracking but not editable post-print.
• Contenido seguro: Avoid embedding sensitive secrets (API keys, internal URLs) in publicly visible codes.

Solución de problemas de escaneo

• Salida borrosa: Increase module size, ensure printer DPI ≥ 300.
• Bajo contraste: Switch to solid dark (#000) on white (#FFF).
• Esquina dañada: Raise ECC level (e.g., M → Q/H).
• Fondo con ruido: Add or enlarge quiet zone.
• Datos saturados: Shorten content (use shorter URL) to reduce version complexity.

Preguntas frecuentes sobre códigos QR

Do QR codes expire?

Static QR codes generated here never expire—they contain the data directly.

Can I edit a code after printing?

No. You would need a dynamic redirect service; static symbols are immutable.

What size should I print?

Ensure smallest module ≥ 0.4 mm for most use; increase for distance viewing.

Is branding safe?

Yes if you preserve finder patterns, adequate contrast, and higher ECC when overlaying graphics.

Can I track scans?

Use a shortened URL pointing to a web analytics endpoint you control (respecting privacy).

Consejos prácticos para empresas

• Control de versión: Use shorter payloads to keep symbol versions low (faster scans).
• Consistencia: Standardize ECC + quiet zone across branded materials.
• Iterar: Prototype small print runs before mass distribution.
• Optimización de la página de destino: Ensure target pages are mobile-friendly and fast.

Lecturas y referencias

• ISO/IEC 18004 – Especificación del código QR
• Wikipedia – Código QR