If you want to split or merge your vCard (VCF) files then you should definitely go for vCard Splitter and Merger tool by DRS. This tool has the capability to add folders of vCard at once. It can convert single or multiple vCard files at once. You are provided with a feature to add a custom file location to your file. When it comes to data security it is a very reliable software. It is compatible with windows 10 and all the previous windows versions. You can download free demo version of the software from the official website for free and try your hands on the software.
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