What is the fastest, easiest tool or method to convert text files between character sets?
Specifically, I need to convert from UTF-8 to ISO-8859-15 and vice versa.
Everything goes: one-liners in your favorite scripting language, command-line tools or other utilities for OS, web sites, etc.
On Linux/UNIX/OS X/cygwin:
Gnu iconv suggested by Troels Arvin is best used as a filter. It seems to be universally available. Example:
$ iconv -f UTF-8 -t ISO-8859-15 in.txt > out.txt
As pointed out by Ben, there is an online converter using iconv.
Gnu recode (manual) suggested by Cheekysoft will convert one or several files in-place. Example:
$ recode UTF8..ISO-8859-15 in.txt
This one uses shorter aliases:
$ recode utf8..l9 in.txt
Recode also supports surfaces which can be used to convert between different line ending types and encodings:
Convert newlines from LF (Unix) to CR-LF (DOS):
$ recode ../CR-LF in.txt
Base64 encode file:
$ recode ../Base64 in.txt
You can also combine them.
Convert a Base64 encoded UTF8 file with Unix line endings to Base64 encoded Latin 1 file with Dos line endings:
$ recode utf8/Base64..l1/CR-LF/Base64 file.txt
On Windows with Powershell (Jay Bazuzi):
PS C:\> gc -en utf8 in.txt | Out-File -en ascii out.txt
(No ISO-8859-15 support though; it says that supported charsets are unicode, utf7, utf8, utf32, ascii, bigendianunicode, default, and oem.)
Do you mean iso-8859-1 support? Using "String" does this e.g. for vice versa
gc -en string in.txt | Out-File -en utf8 out.txt
Note: The possible enumeration values are "Unknown, String, Unicode, Byte, BigEndianUnicode, UTF8, UTF7, Ascii".
Stand-alone utility approach
iconv -f ISO-8859-1 -t UTF-8 in.txt > out.txt
-f ENCODING the encoding of the input
-t ENCODING the encoding of the output
You don't have to specify either of these arguments. They will default to your current locale, which is usually UTF-8.