MaxiCode is a public-domain, machine-readable symbol system developed by United Parcel Service (UPS) in 1992. Designed for tracking and managing package shipments, it resembles an Aztec Code or QR code but uses dots in a hexagonal grid instead of square grid. It is standardized under ISO/IEC 16023.

A MaxiCode symbol—also called "Bird's Eye", "Target", "dense code", or "UPS code"—is a 1-inch square with a central bullseye surrounded by hexagonal dots. It stores about 93 characters, and up to 8 symbols can be linked to carry more data. The symmetrical bullseye aids in fast, accurate scanning, even on moving packages.

MaxiCode symbols using modes 2 and 3 include a Structured Carrier Message containing key information about a package. This information is protected with a strong Reed–Solomon error correction code, allowing it to be read even if a portion of the symbol is damaged. These fields include:

The structured portion of the message is stored in the inner area of the symbol, near the bull's-eye pattern. (In modes that do not include a structured portion, the inner area simply stores the beginning of the message.)

Irrespective of mode, a variable amount of application-specific information can be encoded in a MaxiCode symbol. This format of this additional data is not strictly defined, and amongst other information may include:

UPS labels use Mode 2 or 3 MaxiCodes.