Structure Finder Patterns + Alignment Patterns + Timing Patterns + Data & Error Correction Codewords

Capacity Numeric: 7,089 chars, Alphanumeric: 4,296 chars, Binary: 2,953 bytes

Character Set Numeric, Alphanumeric, Byte, Kanji

This standard is widely used in the following industries:

Mobile Marketing, URLs, Wi-Fi Config, Payments, product packaging

⚡ The Science Inside

How our Rust engine optimizes this specific format:

Mixed-mode DP segmentation (Numeric/Alphanumeric/Byte/Kanji) minimizes total bits for ISO 18004.

• Version-specific header + character-count bit accounting ensures segments always fit the chosen version.
• ECI (UTF-8) is inserted only when bytes fall outside Latin-1, keeping typical payloads smaller.
• Reed-Solomon ECC uses a cached GF(256) encoder and spec-compliant block interleaving without expanding bits (lower memory).
• Mask selection evaluates ISO penalty rules with word-level scans, popcount balance, and virtual masking (no matrix clones).
• Fast paths: stack-allocated DP for <=64 chars, and short/homogeneous content skips DP for speed.