AAC to OGG Converter
Drop an AAC file here and get back an Ogg Vorbis file encoded with libvorbis at its default quality setting. Worth knowing before you start: Vorbis is lossy, so this is a re-encode of already-compressed audio, not a way to recover detail.
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AAC to OGG: what actually changes
A .aac file is normally a raw ADTS stream, the bare AAC-LC or HE-AAC frames with no real container around them. That is what stream recorders, set-top boxes and ffmpeg track extractions tend to produce, and it is also why the file has nowhere to store a title or an album name, and why many engines and web audio pipelines will not load it. Ogg Vorbis is the opposite kind of file: a documented open container with a royalty-free codec, played natively by Firefox and Chrome, by Android, and by engines like Godot and Unity.
The conversion happens on our servers in a single ffmpeg 5.1.9 pass. The AAC stream is decoded (both AAC-LC and HE-AAC are handled by the build we run) and re-encoded with libvorbis. We do not pass a bitrate, so libvorbis falls back to its default variable-bitrate quality 3: roughly 112 kbps nominal for 44.1 kHz stereo and around 80 kbps for mono, with the real figure drifting with the material. There is no quality slider on this page, and no normalization, resampling or noise filtering is applied.
Sample rate and channel layout come through unchanged. A 96 kHz AAC stream stays at 96 kHz in the Ogg file, and a 5.1 stream stays 5.1 instead of being folded down. Tags become Vorbis comments when the source had any, but a raw ADTS .aac carries no tags at all, so most .aac inputs produce an Ogg file with empty comments; if you drop an .m4a on this page instead, its title, artist and album do carry over. Embedded cover art is always dropped, because every picture stream is discarded during conversion, and chapter markers are not written into Ogg either.
Most people who land here are either chasing a royalty-free codec for a game or web project, or trying to feed audio into software that refuses raw AAC. Both work. What this page cannot do is make the audio better than the AAC you started with, so if you still have a lossless master, encode Vorbis from that instead of from the AAC.
Converting your AAC files step by step
- Check what you actually have. Files ending in .aac, .m4a, .m4b, .mp3, .wav, .flac, .wma and similar common audio extensions are accepted here as long as OGG is one of their supported targets; a video file dropped on an audio page is refused.
- Drag the files into the dropzone or use the file picker. You can queue several at once: up to 10 files per request without an account, and up to 50 MB per file (100 MB once you sign in, more on paid plans).
- Start the conversion and leave the tab open. A typical few-megabyte AAC file finishes within a handful of seconds of the upload completing; long recordings take proportionally longer and are cut off at 30 minutes of processing.
- Download each Ogg file from the results list. Names match the original with the extension swapped, so interview-03.aac becomes interview-03.ogg.
- Save the downloads promptly. The link stays alive for about four hours, then the output is deleted from our servers automatically.
What this converter does
- libvorbis encoding at the encoder's default VBR quality 3, the same setting for every file so results are predictable
- Sample rate preserved exactly, including 48 kHz and 96 kHz sources
- Channel layout preserved, so multichannel AAC stays multichannel rather than being downmixed to stereo
- Decodes AAC-LC and HE-AAC, plus the other common audio sources on the same page if you have a mixed folder
- Several files per request, each converted separately and downloaded as its own Ogg file
- Output named after your input file, with no watermark or audio tag added to the stream
Video Tutorial
Watch this step-by-step tutorial to learn how to convert AAC files to OGG format online for free using MiConvert.com. No software installation required.
AAC to OGG questions
Will the OGG sound better than the AAC?
No. AAC and Vorbis are both lossy, so the conversion decodes your AAC and compresses it again, which adds a second generation of loss. Convert when you need the Ogg format or the royalty-free codec, not as an upgrade. If a lossless original exists, encode from that.
Can I choose the Vorbis quality or bitrate?
Not here. We call libvorbis without a bitrate argument, which means quality 3 for every job. If you need a specific setting such as q6 or a fixed nominal bitrate, run ffmpeg on your own machine where you can pass the quality flag yourself.
Do my tags and album art survive?
Cover art never survives: picture streams are discarded on every conversion we run. Text tags become Vorbis comments when the source has them, but raw ADTS .aac files have no tag space, so there is usually nothing to copy. Converting an .m4a instead will carry title, artist and album.
Will the OGG play on an iPhone or in Safari?
Playback for Ogg Vorbis is reliable in Chrome, Firefox and on Android, and patchy on Apple devices depending on the app and OS version. If the file has to play everywhere, convert the AAC to MP3 or M4A instead and keep Ogg for the browsers and engines that want it.
What about surround sound?
Vorbis handles multichannel audio, and we do not add a downmix step, so a 5.1 AAC stream comes out as a 5.1 Ogg file. Bear in mind that quality 3 spreads a modest bitrate across all those channels.
The conversion failed with "Invalid data found when processing input". Why?
That message means ffmpeg could not parse the stream, which almost always comes down to a truncated download or a file that is not really AAC despite the extension. Re-download or re-export the file and try again. If the file is a protected purchase, it cannot be decoded at all.
How many conversions can I run?
Guests and free accounts get 10 conversion jobs per hour from one IP address, two running at a time, with up to 10 files per job. Plus and Pro raise those to 50 jobs an hour, five at once and 25 or 50 files per batch, along with larger per-file limits.
What happens to my files afterwards?
Conversion runs on our servers over HTTPS, not in your browser. Your uploaded AAC is deleted as soon as the job finishes, and the converted Ogg file can be downloaded for about four hours before it is removed automatically. We do log file names, sizes and outcomes for diagnostics, and signed-in accounts keep a conversion history row.