GSRT to M4R Converter
Convert your gsrt files to m4r online & free
Grandstream ring-tone files
MPEG 4 Ringtones Audio
How to convert GSRT to M4R
Select files from Computer, Google Drive, Dropbox, URL or by dragging it on the page.
Choose "to m4r"
Choose m4r or any other format you need as a result (more than 200 formats supported)
Download your m4r
Let the file convert and you can download your m4r file right afterwards