Générer QR codes for URLs and data
QR codes coder données en un 2D barcode scannable par cameras. Apprendre erreur correction levels, capacity limits, et best practices.
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QR codes encode data as a 2D matrix of black/white modules. Features: error correction (L=7%, M=15%, Q=25%, H=30% of data recoverable), version (1-40, determines size and capacity), encoding modes (numeric, alphanumeric, byte, Kanji). Capacity: version 40 with L error correction holds 2,953 bytes. Use M (15%) for general use, H (30%) for industrial/dirty environments.
- 2 Générateur de codes QR →
Générer a QR code from text or a URL. Specify the error correction level (L/M/Q/H) and size. For URLs, include the full URL (https://...). For WiFi, use the format: WIFI:S:<ssid>;T:<WPA|WEP|>;P:<password>;;. For contact info, use the vCard format.
- 3 Générateur et lecteur de codes-barres →
Générer a 1D barcode (Code128, EAN13, UPC) for comparison. 1D barcodes hold less data (typically 20 chars) but are simpler and more widely supported by legacy scanners. Use QR codes for URLs and complex data; use 1D barcodes for product IDs and simple identifiers.
Questions fréquentes
- What error correction level should I use?
- L (7%): clean environments, maximum data. M (15%): general use, good balance. Q (25%): moderate dirt/damage risk. H (30%): industrial, dirty, or partially obscured codes. Higher error correction reduces data capacity and increases size. For URLs on screens, M is sufficient. For printed codes in industrial settings, use H.
- How do I optimize QR code size?
- Use the shortest data possible (URL shorteners for URLs), choose the lowest version that fits (auto-detected by most generators), use numeric mode for numbers (3x more efficient than byte mode), use alphanumeric mode for URLs (2x more efficient than byte mode). Avoid H error correction unless needed — it increases size. Test with various scanners to ensure readability.