Free Online 4-State Barcode Maker


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The 4-State(PostBar)  barcode is a barcode used by postal services that consists of four barcodes of different heights that can represent numbers and letters.

The 4-State barcode is a variant developed on the basis of the circular barcode.

Its historical origins date back to 1949, when Norm Woodland and Bernard Silver invented the omnidirectional barcode symbology. Later, they improved this symbol into a circular barcode, which was patented in 1952.


It consists of four barcodes of different heights, representing 0, 1, 2 and 3 respectively.

It can represent numbers 0-9 and letters A-Z, and each character is represented by four barcodes.

It contains a format control code (FCC) that indicates the type and length of the barcode.

It also contains a checksum to detect whether the barcode is correct.


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