Why MP3 to OGG, for this MP3 file
Browsers, some games, and open-source players want OGG.
The OGG sound you will actually get
The MP3 is re-encoded as Vorbis in an OGG file on your device.
Phones and car stereos often cannot play OGG. Do not send it to someone unless they asked for it. Quality will not beat the MP3.
Why MP3 to OGG is its own job
MP3 to OGG sits on this site because MP3 and OGG are not interchangeable, even when they look similar in a file list. Browsers, some games, and open-source players want OGG. Podcast hosts, cars, WhatsApp, and old speakers expect MP3. Use OGG when a game or a web player asked for it. Cars and phones often cannot play it.
The MP3 is re-encoded as Vorbis in an OGG file on your device.
The MP3 file you already have
MP3 is the audio file that plays everywhere. It is lossy. Music is often 192 to 320 kbps. Speech can be lower. Each MP3 save throws away a little more. Turning MP3 into WAV or FLAC does not bring the lost detail back.
Keep WAV or FLAC if you might edit again. Keep the MP3 if it is your only copy.
What a OGG result is for
The download has to be OGG, because that is the format the next step named. Use OGG when a game or a web player asked for it. Cars and phones often cannot play it. It is a fine web and open-source copy.
Quality will not beat the MP3 or WAV you started with.
How to tell that MP3 to OGG worked
MP3 to OGG is worth using only when OGG is what the next step actually named. Browsers, some games, and open-source players want OGG. What you get from MP3 to OGG: The MP3 is re-encoded as Vorbis in an OGG file on your device. Before you trust it: Phones and car stereos often cannot play OGG. Do not send it to someone unless they asked for it. Quality will not beat the MP3. The file stays on your device. The first run downloads a converter, so keep this tab open. A phone runs out of memory on long files. A computer is the safer place for a big clip. A second pass rarely helps. If the first OGG file is rejected, read the error from the program that rejected it. Another conversion of a bad result usually makes the file worse, not more compatible. When you are done, you should still have the MP3 original and one OGG download that you have opened. If those two are the same kind of failure, this was the wrong tool and the page above is the place that says so. Audio conversions are one-way once the format is lossy. MP3 to OGG can change the container or the codec so a player opens the file. It cannot make a muffled take clearer, and it cannot turn an MP3 into a studio master by calling the result WAV or FLAC. Finish the edit on the best copy you have, then make the share file once.
Here is the decision for MP3 to OGG. You start with MP3 and you stop when a real program accepts OGG. Compatibility is the reason to make an MP3, not an improvement in sound. Do not send OGG to someone unless they asked. They may not have a player. If those two sentences describe a tradeoff you do not want, do not convert. Renaming the extension by hand will not do this job. Running the tool twice on its own output will not do it either.
Phones and car stereos often cannot play OGG. Do not send it to someone unless they asked for it. Quality will not beat the MP3.
A related step, if you still need one, is OGG to MP3.
Other jobs start from the homepage, where each tool is named for the conversion it actually does.