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