Convert OGG to AAC
Convert OGG Vorbis files to AAC format instantly in your browser. AAC is the native audio codec for iPhone, iPad, Apple Music, and virtually every streaming service — OGG has poor Apple ecosystem support. No upload needed.
Drag 'n' drop files here, or
click to select files
.ogg, .oga
Drop your files and click Convert to get AAC
//when_to_use
When to Convert OGG to AAC
- Converting OGG sound effects extracted from a Godot game project to AAC for playback in an iOS companion app
- Making Wikipedia OGG audio clips playable on an iPhone without installing a third-party codec app
- Converting OGG music tracks from a Linux-based music player library to AAC for import into Apple Music on Mac
- Preparing OGG podcast episode masters to AAC for submission to Apple Podcasts Connect
- Converting OGG Bandcamp downloads to AAC for syncing to an iPhone via iTunes or the Finder
//comparison
OGG vs AAC
| Property | OGG | AAC |
|---|---|---|
| Compression | Vorbis (lossy, open) | AAC (lossy) |
| Typical file size (4 min song) | ~4 MB | ~5 MB |
| iPhone/iOS support | None (no native decoder) | Native (preferred codec) |
| Apple Music compatibility | Not accepted | Native format |
| Android support | Native | Native |
| Royalty-free | Yes | No (AAC patent pool) |
//how_it_works
How It Works
Drop your OGG files
Drag and drop or select OGG or OGA files. Any Vorbis bitrate and sample rate is supported. First use loads FFmpeg WASM (~30MB).
FFmpeg decodes Vorbis
FFmpeg WASM parses the OGG container and decodes the Vorbis audio stream to raw PCM samples using libvorbis. Everything runs locally in your browser.
AAC encoding at 192kbps
The FFmpeg native AAC encoder compresses the PCM at 192kbps CBR with temporal noise shaping for Apple-quality output in an ADTS container.
Download AAC files
Your AAC files are ready for iPhone, iPad, Apple Music, iTunes, or any Apple device that doesn't support native OGG playback.
// under the hood
OGG Vorbis uses overlapping MDCT with psychoacoustic masking for lossy compression. AAC uses MDCT with temporal noise shaping (TNS) and perceptual noise substitution (PNS), generally outperforming Vorbis at equivalent bitrates. Our converter uses FFmpeg WASM to decode the Vorbis stream from the OGG container using libvorbis, then re-encodes with the native FFmpeg AAC encoder (libavcodec aac) at 192kbps CBR in an ADTS container. Both formats are lossy, so a second encode stage applies.
//faq
Frequently Asked Questions
- Why convert OGG to AAC?
- OGG Vorbis is not supported on iPhone, iPad, or iOS at all — Apple's CoreAudio framework simply doesn't include a Vorbis decoder. If you have OGG audio from a game, Linux system, or Wikipedia download that you want to play on an Apple device or send to a streaming service, converting to AAC is the correct solution.
- Does OGG to AAC conversion degrade quality?
- Yes — both OGG and AAC are lossy formats, so transcoding introduces a second encoding stage that causes small additional quality loss. We encode at 192kbps AAC to minimise this. If audio quality is critical, first convert OGG to WAV (lossless decode), then convert the WAV to AAC for a cleaner encode.
- What container does the AAC output use?
- Our converter outputs AAC in an ADTS bitstream container (.aac), which is natively supported by all Apple devices and players. If you need an M4A container (required by some iOS workflows), you can rewrap the ADTS AAC to M4A using QuickTime Player without re-encoding.
- Will the AAC play on Spotify, YouTube Music, or Apple Music?
- AAC is the native codec for Apple Music and is accepted by YouTube Music, Spotify, and most streaming platforms as an upload format. Note that each platform re-encodes your upload for their own delivery — but starting with AAC rather than OGG avoids the platform needing to transcode an unsupported format.
- Is my OGG file private during conversion?
- Yes. All conversion runs locally in your browser via FFmpeg WebAssembly. Your OGG files never leave your device — no upload, no server processing, no logging.
//related_converters
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→Convert FLAC to MP3
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→