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Technical guides on QR codes, crypto and printing
QR code with a logo: the error budget, and how not to blow it
Adding a logo to a QR code without breaking it: Reed-Solomon budget, real size limit, feathered masking, and the mistakes that make a code unreadable.
Read article → 2026-07-31BIP-21, EIP-681, Solana Pay: crypto payment URIs and their traps
The three crypto payment URI standards compared: units, parameters, ERC-20 and SPL token transfers, and the decimal mistakes that cost real money.
Read article → 2026-07-31Printing a QR code: size, contrast and scanning distance
What minimum size for a printed QR? What contrast? Business cards, flyers, menus, stickers: concrete rules for a successful scan every time.
Read article → 2026-07-31Share Wi-Fi via QR Code: Format, Security & Best Practices
Learn how to generate secure Wi-Fi QR codes using the standard WIFI:T:WPA;S:SSID;P:PASS;; format for homes and offices.
Read article → 2026-07-31vCard 4.0: Guide Technique pour une Carte de Visite Numérique par QR Code
Découvrez comment générer une vCard 4.0 optimisée via un QR code client-side, avec gestion des champs, photo et poids.
Read article → 2026-07-31QR Code Error Correction: Reed-Solomon Levels L/M/Q/H Explained
Understand how Reed-Solomon error correction works in QR codes, covering L/M/Q/H levels, redundancy mechanics, and logo integration.
Read article → 2026-07-31Static vs Dynamic QR Codes: Why web3qr Stays 100% Static
Discover why static QR codes offer superior longevity and privacy compared to dynamic ones, which require servers and accounts.
Read article → 2026-07-31QR Code vs Barcode: Capacity, Orientation & Use Cases Explained
Compare QR codes and 1D barcodes like EAN-13. Learn about data capacity, scanning orientation, and when to choose each for retail or marketing.
Read article → 2026-07-318 Reasons Why Your QR Code Becomes Unscannable
Avoid common pitfalls like low contrast, missing quiet zones, and poor error correction to ensure your QR codes are always scannable.
Read article → 2026-07-31iCal QR codes for events: Add to calendar in one scan
Generate iCal-compatible QR codes for your events. Instant calendar integration with timezone management and complete VEVENT format handling.
Read article → 2026-07-31QR Code GPS géolocalisé : Partager un lieu précis avec geo: URI
Découvrez comment créer un QR code GPS pour partager des coordonnées précises via Google Maps ou Apple Plans, sans serveur ni inscription.
Read article → 2026-07-31EAN-13 Structure & Checksum Guide: GS1 Codes vs Internal Use
Master EAN-13 barcode structure, checksum calculation, and the critical difference between official GS1 registration and internal generation.
Read article → 2026-07-31Optimize Your Restaurant QR Code Menu: Speed, Hygiene & Design
Learn why heavy PDFs ruin the dining experience and how to optimize your restaurant QR code menu with lightweight alternatives, proper placement, and high-contrast design for dark environments.
Read article → 2026-07-31Real Estate QR Codes: Listings, Virtual Tours & DPE Data
Boost real estate marketing with client-side QR codes for listings, virtual tours, and DPE reports. No signup needed.
Read article → 2026-07-31Crypto & SEPA Payment QR Codes: BIP-21, EIP-681 & Security Risks
Explore technical standards for crypto and fiat payment QR codes, including BIP-21, EPC069-12, and critical security risks like QR substitution attacks.
Read article → 2026-08-01Click Tracking Without Third-Party Services: UTM Parameters & Static QR Codes
Learn how to implement effective click tracking using static QR codes and UTM parameters in Matomo or Google Analytics, avoiding third-party redirection services.
Read article → 2026-08-01Dynamic Page QR Code: Free Alternative to Paid Dynamic Codes
Learn how to create a dynamic page equivalent for your static QR codes using free hosting and redirects, avoiding paid subscriptions and data collection.
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