Is there a way to convert .thumbdata3--1763508120 files to .mp3 format?
It is not possible to convert Android Gallery Thumbnail Index files directly to MP3 Audio Files (.thumbdata3--1763508120 to .mp3 conversion). THUMBDATA3--1763508120 files can be found on SD cards of Android devices and they only contain cached thumbnail data of images, yet no documents or multimedia data. That's the reason why it's not possible to extract, export or convert these files to any other format, including MP3.
In a word, direct thumbdata3--1763508120 to mp3 conversion is not possible.
So don't expect any so-called thumbdata3--1763508120 to mp3 converter or thumbdata3--1763508120 to mp3 free online conversion tool available.
The database currently does not contain any thumbdata3--1763508120 software converter.