Convert MP3 to OGG

Who asks for OGG

• Games and engines. Minecraft resource packs use .ogg sound files, Godot imports Ogg Vorbis directly, and many other engines and mod tools prefer it.
• Discord bots. Discord voice runs on Opus, so bot libraries can often stream an Ogg Opus file without converting it on the fly.
• Open-source programs and web apps, where OGG is the format that needs no license fees.

OGG plays in Chrome, Firefox, VLC and on Android, so a web game or app can use it directly. For phones, cars and Apple devices MP3 remains the safer format, so keep your MP3s and treat the OGGs as copies for the project that needs them.

Mod and game communities often spell out exactly what they want: Vorbis or Opus, a sample rate, mono or stereo. All of those are in More settings, and whatever you set there applies to the whole batch, so a pack of a hundred sounds comes out consistent.

Vorbis or Opus?

Both end in .ogg. Opus always works at 48 kHz, so 44.1 kHz MP3s are resampled for it; Vorbis keeps the MP3's own rate. If an app wants the .opus extension instead of .ogg, choose the OPUS format, which you'll find under All 15 sound formats or by typing “opus” into Find a format.

For a bot that mostly plays speech or sound effects, Opus at Small is plenty and keeps the files tiny. For background music in a game, Vorbis at Balanced or As it is is the usual pick. Opus's presets sit lower than Vorbis's because it sounds good at lower bit rates, especially for speech.

Quality: what a second compression costs

MP3 to OGG is lossy to lossy: the MP3 already left detail out, and the OGG encoder leaves out a little more. Keeping the bit rate at or above the MP3's makes that very hard to hear, which is what As it is does: a 192 kbps MP3 becomes a 192 kbps Vorbis file, and a 320 kbps one becomes 256, the top Vorbis preset.

If you still have the original WAV or FLAC, convert from that instead and you skip the extra step. For short sound effects, Mono under More settings halves the size, and a footstep or a click rarely needs two channels anyway; check what your engine expects for sounds placed in the game world.

Before converting a big batch, try one file in the game or bot first. If it plays as expected, convert the rest with the same settings; they stay chosen until you change them or press Put these back as they were.

Tags, names and folders

The title and artist in each MP3 go into the OGG's own tags, so music players still show them. Cover art is not kept: OGG files from Octoolo carry the sound and its tags only, which suits games, where artwork would just be extra weight.

Each OGG keeps its MP3's name. Some games and mods expect exact file names, so rename the MP3s first the way the game wants them, and the converted files will match without any renaming afterward. With Save in left as it is, every OGG lands in the same subfolder as its MP3, so a mod's folder layout stays intact. If the game wants one sample rate for everything, 44.1 or 48 kHz, set it under Sample rate and the whole batch follows. The MP3s themselves keep their covers and stay untouched.