It seems that .arff files can only be produced by Weka data mining software, so only way to create from .csv file would be to import that to Weka and use the data for making .arff files. This looks like to be the only way how to achieve csv to arff conversion.
Home > Search converters: csv to arff
Conversion of csv file format to arff file format beta
Search for csv to arff converter or software able to handle these file types.
Convert Comma Separated Value file to Weka attribute-relation data.
We have found one software suitable in our database for this conversion.
Microsoft Windows software 
- convert csv to arff on Windows
Weka
A machine learning software to solve data mining problems
File extension | Convert | Open | Save | Edit | Create | Import | Export | Extract |
|---|---|---|---|---|---|---|---|---|
Convert from csv file | No | No | No | No | No | Yes | Yes | No |
to arff file | No | Yes | Yes | arff editor | Yes | No | No | No |
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.
Additional links: Open csv file, Open arff file
CSV
Files with csv extension are text data files in common Comma Separated Value file format. Simple text file with values divided by comma, often used as an import/export format.
ARFF
Files with arff extension are related to Attribute-Relation file format. Some sort of ASCII format used by Machine Learning Project at the Department of Computer Science of The University of Waikato.
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