Check whether the original post has audio
Play the public post while signed out and confirm that it really contains sound. A muted recording or silent animation cannot be made audible by conversion. If the media belongs to another supported platform, use its direct post URL so the correct extractor handles it.
Separate streams need a compatible partner
YouTube and Reddit can supply video and audio as different streams. SaveFromNet combines compatible streams when both are accessible and does not offer a video-only source as a normal finished video with sound. Some source pages still expose only silent or incomplete media to anonymous visitors.
MP3 is not a repair for missing audio
An MP3 option appears only when the extractor finds usable sound. If the result has no audio choice, check whether the post is restricted, removed, still live, or simply silent. Higher output bitrate cannot restore a track that does not exist.
Only download content you own or have permission to use. No login, paywall, DRM, or private-access bypass is offered.
Questions about this topic
Will changing from MP4 to WebM add sound?
No. A container name does not create an audio track; the source must expose audio that can be combined or extracted.
Why does a Reddit video need merging?
Reddit may publish picture and sound separately. The Reddit guide explains that source behavior in more detail.