Which Kindle would that be

none of them have the name "Glare-free".
The 2014 models I believe would be the Kindle Voyage (KV) and the currently latest "Basic" model (KT2)
See
Kindle Serial Numbers for ID'ing different devices and their standard nicknames.
It all depends on the quality of the PDF.
If the PDF is fitted to the dimensions of the screen (800 x 600, 167 ppi), then all will be well.
If not, you will want to take a look at
k2pdfopt.
...
If you jailbreak the device, you can run
KOReader on it, which includes parts of k2pdfopt and will reflow the PDF on-the-fly.