That's equivalent to
225bits,
which could be used to represent any message consisting of 28 8-bit
characters. However, there are countless ways of encoding a
message – so by compressing the text before turning it into the
corresponding sequence of playing cards, it's possible to handle longer
messages (in English, at least). If you allow cards to face both up
and down, then messages can be just over 20% longer
(277 bits, or
34 8-bit characters with
363 sexvigintillion permutations –
3.6×1083). When decoding, try using the
Reverse and Flip all buttons if you think you may have
entered the sequence the wrong way.
With this encoder, you can use any
Unicode character –
i.e. digits, punctuation, mixed case letters and non-English
symbols, for example with
accents/umlats,
characters from Chinese, Japanese, Korean, etc., and even
random things like
smiley faces.
Short messages require fewer cards, so there's no need to use a whole
pack (you might use a "Joker" to mark the end). If you want to use
multiple packs for longer messages, simply encode each part of your
message using one pack at a time. See
this technical document to learn
more. This web page does not steal / transmit what you type.