Coder
    Mixed inputSelect   Convert numbers as   Convert \x 
Characters
 HTML/XMLSelect       Escape invisible characters Convert bidi controls to HTML markup
 Percent encoding for URIsSelect   
 Hexadecimal NCRsSelect         Show ascii Latin1
 Decimal NCRsSelect         Show ascii Latin1
 Unicode U+hex notationSelect       Show ascii Latin1
 0x... notationSelect       Show ascii Latin1
 Hexadecimal code pointsSelect       Show ascii Latin1
 Decimal code pointsSelect       Show ascii Latin1
 UTF-8 code unitsSelect   
 UTF-16 code unitsSelect   
 JavaScript escapesSelect       Use C-style Supp. Chars.
 CSS escapesSelect

Type or paste text in any of the green or grey shaded boxes and click on the button Convert button above it. Alternative representations will appear in all the other boxes. You can then cut & paste the results into your document. Select selects all the text in a box. See the notes at the bottom of the page for other options.

Notes

Most of the time you will probably drop the text to be converted in the Mixed input field, and hit the associated Convert button. This will convert all escapes to characters, then convert that into each of the forms listed against the boxes below. If your text contains bare numbers that you also want to convert, use one of the convert buttons to the right. (Be aware, however, that in this case something like 'ab' could be interpreted as a hex number.)