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7-Segment Display

Tool for translating abcdefg codes (or binary or numeric codes) into 7-segment display (the name given to digital screens dedicated to numbers on alarm clocks, watches, etc.)

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7-Segment Display -

Tag(s) : Electronics, Substitution Cipher, Character Encoding

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7-Segment Display

7-Segment Decoder




7-Segment Encoder





Tool for translating abcdefg codes (or binary or numeric codes) into 7-segment display (the name given to digital screens dedicated to numbers on alarm clocks, watches, etc.)

Answers to Questions

How does a 7 segment display works?

Basically, the display consists of seven segments identified by a letter (from a to g), organized as follows: <b>7-segment</b> and each segment is generally associated with an LCD screen or a LED and can thus be activated / on 1 or off 0. There are a total of 128 possible combinations of display, although it is most often the combinations for the 10 digits (from 0 to 9) that are used.

How to encrypt with a 7 segment based cipher?

Segment combinations can represent characters. A combination is generally identified by a series of 1 to 7 letters (from a to g) corresponding to the activated segments.

It is also possible to identify them with a binary string 1 = active, 0 = inactive, starting from the end gfedcba. In this way a is 0000001 and g is 1000000

Example: char(127) has all active segments coded either abcdefg or 1111111

Example: char(92) has the 4 bottom segments active, coded either 'c, d, e, g' or 1011100

The 7-segments displays may be common cathode (CC) or common anode (CA), in this second case the 0 and 1 are switched.

How to decrypt a 7 segment cipher?

Associating an abcdefg code with a display consists of illuminating / activating the corresponding segments.

Example: abcdefg illuminates all segments and displays char(127)

Example: bcdeg illuminates segments b,c,d,e,g and displays char(94)

What is a common anode or common cathode display?

In a common cathode display, these are connected to the low potential, a segment is displayed by activating it in its logical 1 position.

In a common anode display, these are connected to the high potential, so a segment is displayed by activating it in its logical 0 position.

How to recognize a 7 segment ciphertext?

The code consists of the letters a,b,c,d,e,f,g only, in groups of 1 to 7 letters without repetition.

For the binary variant, the codes are normally on 7 bits from 0000000 to 1111111.

The presence of a calculator, a clock or a digital watch or the characters 7SEG are clues.

What are the variants of the 7 segment display?

There exists also 9 segment displays (with an additional 2 segment diagonal), 14 segments (with 2 diagonals and a central vertical bar) or 16 segments (identical to the 14 segments but with the top and bottom segments cut in half).

The Beghilos code uses the 7 segments with a reverse reading (backwards).

When 7 segment displays have been invented ?

The first patents date from the beginning of the 20th century (1903, 1908, 1910) but the advent of the displays came in the 1970s.

Source code

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Thanks to your feedback and relevant comments, dCode has developped the best 7-Segment Display tool, so feel free to write! Thank you !


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