Formatting errors are most of the time caused by converters that fail to interpret the CSV column structure correctly. I was struggling with this problem while I was trying to migrate contacts manually. The converter that eventually worked for me in a stable manner was
OSTtoPST CSV to VCF Converter. It provides a preview before exporting and gives you the option to remap the fields so that nothing is misplaced. Just this alone is what prevents most formatting issues from happening. If you are regularly performing CSV to VCF conversion or dealing with business contact lists, then having this kind of control is very valuable. Besides, the tool also supports clean vCard generation; thus, it can be used as a
CSV to vCard converter. I should say that after my work with this tool, I didn't encounter any broken characters or missing details in my VCF files.
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