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    <p><strong>Updated: "update 1", "update 2"</strong></p> <p>You can store 8 Bits in a single charakter with ANSI, ASCII or UTF-8 encoding.</p> <p>But, for example, if you whant to use ASCII-Encoding you shouldn't use the first 5 bits (0001 1111 = 0x1F) and the chars 0x7F there are represent system-charaters like "Escape, null, start of text, end of text ..) who are not can be copy and paste. So you could store 223 (1110 0000 = 0xE0) different informations in one single charakter.</p> <p>If you use UTF-16 you have 2 bytes = 16 bits - system-characters to store your informationen.</p> <pre><code>A in UTF-8 Encoding: 0x0041 (the first 2 digits are every 0!) or 0x41 A in UTF-16 Encoding: 0x0041 (the first 2 digits can be higher then 0) A in ASCII Encoding: 0x41 A in ANSI Encoding: 0x41 </code></pre> <p>see images at the and of this post!</p> <p>update 1:</p> <p>If you not need to modify the values without any tool (c#-tool, javascript-base webpage, ...) you can alternative base64 or zip+base64 your informationens. this solution avoid the problem that you descript in your 2nd update. "here are lots of control characters that I cannot use. How could I manage which characters are ok to use?"</p> <p>If this is not an option you can not avoid to use any type of lookup-table. the shortest way for an lookuptable are:</p> <pre><code>var illegalCharCodes = new byte[]{0x00, 0x01, 0x02, ..., 0x1f, 0x7f}; </code></pre> <p>or you code it like this:</p> <pre><code>//The example based on ASNI-Encoding but in principle its the same with utf-16 var value = 0; if(charcode &gt; 0x7f) value = charcode - 0x1f - 1; //-1 because 0x7f is the first illegalCharCode higher then 0x1f else value = charcode - 0x1f; value -= 1; //because you need a 0 value; //charcode: 0x20 (' ') -&gt; value: 0 //charcode: 0x21 ('!') -&gt; value: 1 //charcode: 0x22 ('"') -&gt; value: 2 //charcode: 0x7e ('~') -&gt; value: 94 //charcode: 0x80 ('€') -&gt; value: 95 //charcode: 0x81 ('�') -&gt; value: 96 //.. </code></pre> <p>update 2:</p> <p>for Unicode (UTF-16) you can use this table: <a href="http://www.tamasoft.co.jp/en/general-info/unicode.html" rel="nofollow noreferrer">http://www.tamasoft.co.jp/en/general-info/unicode.html</a> Any character represent with a symbol like or are empty you should not use. So you can not store 50,000 possible values in one utf-16 character if you allow to copy and past them. you need any spezial-encoder and you must use 2 UTF-16 character like: </p> <pre><code>//charcode: 0x0020 + 0x0020 (' ') &gt; value: 0 //charcode: 0x0020 + 0x0020 (' !') &gt; value: 2 //charcode: 0x0020 + 0x0020 ('!A') &gt; value: something higher 40.000, i dont know excatly because i dont have count the illegal characters in UTF-16 :D </code></pre> <p><a href="http://www.asciitable.com/asciifull.gif" rel="nofollow noreferrer">ASCII-Table http://www.asciitable.com/asciifull.gif</a> <a href="http://www.asciitable.com/extend.gif" rel="nofollow noreferrer">ASCII-Table extended http://www.asciitable.com/extend.gif</a></p>
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    1. POHow much data can you encode in a single character?
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    1. USKieran Benton
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    1. POHow much data can you encode in a single character?
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    1. COCorrection: an UTF-8 character can be anywhere from 1 to 4 bytes.
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    2. COUTF-8 (8-bit Unicode Transformation Format) UTF-8 encodes each character (code point) in 1 to 4 octets (8-bit bytes). Source: http://en.wikipedia.org/wiki/UTF-8
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    3. COyou have right .. my english isnt the best :D
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