Turn OGG files into AAC
This makes an AAC out of the OGG you already have. AAC sounds better than MP3 at the same file size, noticeably so in smaller files. Your file never leaves your computer.
Need the other direction? Convert AAC to OGG
How to convert OGG to AAC
- 1 Drop your OGG .ogg or .oga file onto the page, or click to browse for it.
- 2 Set the quality, or leave the default, which keeps the file small without anything showing.
- 3 Convert. The work happens on your own machine, so how long it takes depends on your computer and the file.
- 4 Download the AAC, or add more files and do the whole set in one go.
Why convert OGG to AAC
- Better quality than MP3 at any comparable file size.
- Plays everywhere without draining the battery.
- Streaming services and broadcast delivery.
- OGG: less consistent support in consumer devices.
OGG compared with AAC
How the two formats differ on the things that decide whether a conversion is worth making.
| Property | OGG | AAC |
|---|---|---|
| File extension | .ogg | .aac |
| Browser support | All current browsers | Every browser |
| Introduced | 2000 | 1997 |
| Developed by | Xiph.Org Foundation | ISO/IEC MPEG |
Quality and what changes
Both formats are lossy, so this is a second generation of compression: the OGG is decoded back to pixels that already carry its artefacts, and AAC then compresses that. The damage compounds rather than cancelling out, which is why repeated round trips visibly degrade an image. Encode at a higher quality than the source used, and convert once from the best copy you have rather than from an already converted file.
- One AAC limitation to keep in mind: a bare .aac file cannot hold artwork and track details the way M4A can.
Questions about OGG to AAC
Will converting OGG to AAC lose quality?
A little. Both formats are lossy, so the file is decoded and compressed a second time and the two sets of artefacts add up. At a high quality setting the difference is hard to see, but avoid repeated round trips between lossy formats.
Is my OGG file uploaded anywhere?
No. The whole thing runs inside the browser tab you already have open. Your OGG is read straight from your own disk, converted on your machine and handed back as an AAC. Nothing is sent anywhere, nothing is stored and there is no account.
Is there a file size limit?
There is no server-side limit because no server sees the file. The real ceiling is your device memory, since the input and the output both have to fit in the tab. A few hundred megabytes is usually fine on a desktop machine and considerably less on a phone.
Can I convert several OGG files at once?
Yes. Add as many as you like and they are processed one after another, then offered as separate AAC downloads or as a single ZIP. Speed depends on your own processor rather than on a queue.
Does the converter work offline?
Yes, after the page has loaded once. The engine is cached by the browser, so you can disconnect, reload and keep converting. That falls out of doing the work locally rather than being a separate mode you switch on.