Use formats people can open
JPG, PDF, MP3, and MP4 are usually safer email attachments than niche formats. They open on more devices and apps.
Shrink where it makes sense
Convert PNG photos to JPG, WAV recordings to MP3, MOV videos to MP4, and editable documents to PDF when the recipient only needs to view them.
Check sensitive content
Before sending, open the converted file and confirm it contains only what you intend to share.