I think you may tryv2.1, it can convert and make EMF bigger in dimension for you.
What is EMF?
Enhanced Metafile (EMF), is a newer version with additional commands. EMF is Windows vector graphics format that is recognized by many image-editing applications; EMF is basically a 32-bit version of the original Windows Metafile Format (.WMF), which only supports 16-bit data, EMF saves image data in an RGB format and does not support CMYK data. EMF is also used as a graphics language for printer drivers.
How to deal with this converting fromin v2.1. Here you will get the solution.
1. Launchv2.1, add your PDF into batch process prepared for being converting: click “Add” button>double-click your PDF in the pop window, you will get its route in batch process field, and then click PDF route>get PDF previewed, you can use preview icons to check on it carefully in PDF To Image Converter v2.1.
2. To set your target file type, click the optional box of “File type”>EMF; to select your target folder for EMF, click “Browse”>target folder>click “ok” in the pop window.
3. To get bigger dimension of EMF, you could enlarge the value of DPI in PDF To Image Converter v2.1.
What is DPI?
DPI means dots per inch, it is used for setting up resolutions, which is proper for printers or other output machines such as scanners. Usually, for bitmap images, the larger your DPI is, the bigger your dimension of image is with the bigger size and the deepen color in images; for vector images, the larger DPI could magnify the dimension of vector image like EMF.
So click the edit-boxes of DPI>input the larger value than 101, you will get your big dimension through larger resolutions. Here we input 300 for each DPI of PDF To Image Converter v2.1.
4. Click “Convert” button to process this converting from pdf to emf in PDF To Image Converter v2.1. Then click “Exit” button to close this converter.