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Drop one OGA or two hundred. Batch conversion is not a paid feature here.
Convert OGA to MP3
An audio file from Wikipedia, a language learning site or an open source project is an .oga and the player will not touch it.
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Audio is re-encoded on your device. The engine downloads once, then works offline.
Waiting for files/Engine: on-device/Network requests made: 0
What actually changes
OGA and MP3 are not the same picture in two wrappers.
The Vorbis, Opus or FLAC audio inside the Ogg container is decoded and re-encoded as MP3.
Worth knowing first
The .oga extension exists specifically to mean audio-only Ogg, but it does not tell you the codec. A .oga carrying FLAC is lossless, so converting it to MP3 discards real information, where one carrying Vorbis is already lossy.
Questions
OGA to MP3, answered
What is the difference between OGA and OGG?
OGA was introduced to distinguish audio-only files from Ogg files that might contain video. In practice both are used loosely.
Why does Wikipedia use these formats?
Wikimedia only hosts patent-free formats, which rules out MP3 and AAC.
How to convert OGA to MP3
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Choose your settings
MP3 Audio is lossy, so the quality control decides the trade between size and fidelity.
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Download
Instant, because the file never went anywhere. Nothing expires, since nothing was stored.