Update: the converter now works entirely in JavaScript, so your financial data remains on your own computer and does not need to be uploaded to the server.
Currently it works for the following banks:
To help me add support for other banks, please send (the first couple of lines of) a CSV file to me at qif@matthijsmelissen.nl
This tool is still in testing phase. Please check manually if the file has been converted correctly. If you find a problem or have any further questions, please contact me at qif@matthijsmelissen.nl.
This tool is written by Matthijs Melissen and published under a CC-0 license. Download the source code on Github.