Convert text encodings easily with JFileConv file encoding converter
JFileConv is a free text, super light, portable and convenient file encoding converter.
It reads a text file using an encoding (e.g. ISO-8859-2) and writes the characters to a file using another encoding (e.g. UTF-8).
The program supports plugins for processing the text and has a preview function which allows you to see how the file is decoded with a particular charset.
The program is distributed as a .zip archive containing a (cross-platform) .jar file and a few other required files.
After unzipping, you may run the program by double-clicking the .jar. Of course you need the Java runtime environment installed.