What problems occur when converting PST contacts to VCF using online methods?

[Ciyoyis2420]

I recently tried to convert my Outlook PST contacts into VCF format using an online conversion tool because I needed to import the contacts into my phone. However, after the conversion, I noticed several issues such as missing contact details, incorrect formatting, and a few duplicate contacts. I am also a bit concerned about uploading my PST file to an online service because it contains personal contact information. Has anyone else experienced similar problems when converting PST contacts to VCF using online methods? What are the common issues with online converters, and is there a safer or more reliable way to perform this conversion without losing data?