sk1 is the vector file format used by the sk1 software, which is open source and an alternative for Adobe Illustrator or CorelDRAW for Linux.
DXF is a common format for Computer Aided Design (CAD). It is developed by Autodesk and it is similar to the DWG format but it is more compatible with other software packages since it is open documented.
+200 Formats Supported
CloudConvert is your universal app for file conversions. We support nearly all audio, video, document, ebook, archive, image, spreadsheet, and presentation formats. Plus, you can use our online tool without downloading any software.
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