0
L
G
R
L 0001101 / G 0100111 / R 1110010
EAN-13 / UPC Barcode Patterns
A mystery cache might show part of a retail barcode without the printed numbers. Compare seven-module stripe patterns to identify the digits, including the hidden first digit.
Digit patterns for L, G and R sets
1
L
G
R
L 0011001 / G 0110011 / R 1100110
2
L
G
R
L 0010011 / G 0011011 / R 1101100
3
L
G
R
L 0111101 / G 0100001 / R 1000010
4
L
G
R
L 0100011 / G 0011101 / R 1011100
5
L
G
R
L 0110001 / G 0111001 / R 1001110
6
L
G
R
L 0101111 / G 0000101 / R 1010000
7
L
G
R
L 0111011 / G 0010001 / R 1000100
8
L
G
R
L 0110111 / G 0001001 / R 1001000
9
L
G
R
L 0001011 / G 0010111 / R 1110100
First-digit parity (EAN-13)
0
LLLLLL
first digit controls left-side encoding
1
LLGLGG
first digit controls left-side encoding
2
LLGGLG
first digit controls left-side encoding
3
LLGGGL
first digit controls left-side encoding
4
LGLLGG
first digit controls left-side encoding
5
LGGLLG
first digit controls left-side encoding
6
LGGGLL
first digit controls left-side encoding
7
LGLGLG
first digit controls left-side encoding
8
LGLGGL
first digit controls left-side encoding
9
LGGLGL
first digit controls left-side encoding
Full example and check digit
Each encoded digit has seven modules: 1 = black, 0 = white. The left six use L or G patterns as directed by the first digit; the right six use R. The guard bars are 101, 01010 and 101. The 13th digit is a checksum (alternating weights 1 and 3 across the first 12 digits).