Add your OGG file
Drop one or more .ogg files onto the converter above, or browse for them. They load into browser memory only. Nothing is uploaded, so there is no size-based pricing and no server queue.
OGG to AAC
Re-encoding .ogg audio as .aac changes how the sound is compressed and which players will accept it. Free, private, and validated: the file never leaves your browser.
Private for supported formats, processed in your browser
Runs on your deviceConvert supported files
Drop OGG files here
Batch files can each use a different output. Nothing uploads for local conversions.
Working inputs include camera RAW, browser-local audio/video, PDF, CBZ/CBR comics, office documents, ebooks, markup, 3D models, structured text, images, and archives.About converting Ogg audio to AAC audio
Re-encoding .ogg audio as .aac changes how the sound is compressed and which players will accept it. An .ogg file almost always means Vorbis-compressed audio in the Ogg container, the free-software world's answer to MP3. The .ogg extension originally covered any Xiph media; audio kept the name when video moved to .ogv, and game developers and Wikipedia still lean on it heavily.
An .aac file holds raw Advanced Audio Coding data, usually as an ADTS stream. AAC was designed as MP3's successor and delivers audibly better quality at the same bitrate, though the bare .aac extension is rarer than AAC audio traveling inside .m4a or .mp4 files. For this route the practical draw is noticeably more efficient than MP3 at equal bitrates and hardware decoding in essentially every phone and TV, balanced against raw ADTS files handle tags and cover art poorly, which is worth knowing before you commit a large batch.
Why convert OGG to AAC?
The practical trigger for this conversion is usually a mismatch: with .ogg, apple's Music app and iOS offer no native playback. Switching to .aac buys you noticeably more efficient than MP3 at equal bitrates, which is why it is the better fit for receiving the audio track copied out of MP4 video without re-encoding. Because the conversion runs locally, trying it costs nothing but a few seconds of compute on your own machine.
OGG vs AAC at a glance
| Aspect | Ogg audio (.ogg) | AAC audio (.aac) |
|---|---|---|
| Format type | Lossy: discards detail it judges invisible to shrink files | Lossy: discards detail it judges invisible to shrink files |
| How it stores data | vorbis is an MDCT-based lossy codec tuned through a quality scale (-q) rather than fixed bitrates | a pure MDCT transform codec, free of the hybrid filterbank compromise that limited MP3 |
| Strongest at | shipping game audio assets without codec royalties | receiving the audio track copied out of MP4 video without re-encoding |
| Weak spot | apple's Music app and iOS offer no native playback | raw ADTS files handle tags and cover art poorly |
| Metadata | vorbis comments, the flexible key=value system shared with FLAC and Opus, plus METADATA_BLOCK_PICTURE for embedded cover art. Neither reaches an output written here: metadata mapping is disabled on every conversion, so comments and embedded artwork are dropped in both directions | no standard tag container exists for raw ADTS streams; ID3 tags are sometimes prepended but poorly supported, so wrapping in .m4a is the reliable way to tag AAC. Wrapping it here will not help: metadata mapping is disabled on every route, so the .m4a this app writes is as untagged as the .aac, and tagging has to happen afterwards in a player or tag editor |
Pick AAC as the output
Select .aac in the output menu next to each file. The menu only offers targets this engine can genuinely produce, so if AAC is selectable, the route is real and validated.
Convert on your device
Press Convert. The transcode runs on an FFmpeg engine compiled to WebAssembly, so the audio never leaves your device.
Verify and download
Each result is checked before the download unlocks: where AAC has a signature or a structure this converter can read back, the file is re-opened and parsed, and where it has neither, the check is that a non-empty file of the declared type came back. A result that fails is reported as an error instead of being offered for download, and outputs keep the original filename with the .aac extension.
OGG to AAC questions, answered
Will converting OGG to AAC lose quality?
A second lossy step always costs a little, because ogg is lossy-oriented and aac is lossy-oriented and each encoder discards detail differently (generation loss). At the default quality the difference is rarely visible; avoid repeated round-trips between .ogg and .aac.
Is it private to convert OGG files here?
Yes. The .ogg file is processed inside your browser tab and never uploaded. The transcode runs on an FFmpeg engine compiled to WebAssembly, so the audio never leaves your device. Close the tab and the file is gone from memory.
Where will the AAC file work?
AAC decoding is built into every browser, phone, and operating system, whether the audio arrives as a raw .aac stream or inside an .m4a wrapper. The last holdouts are elderly MP3-only car stereos and bargain portable players. Novus Convert reads .aac and writes it as a raw ADTS elementary stream, using FFmpeg's built-in AAC encoder at a constant bitrate the quality slider sets between 55 and 192 kbps. That is a narrow band by AAC standards, so the top of the slider is 192 kbps and no higher, and there is no variable-bitrate or HE-AAC mode on this route. Choose the .m4a target instead if you want the same audio in an MPEG-4 wrapper. Input is capped at 500 MB.
Will the AAC file be bigger or smaller than my OGG?
It depends on the content: a pure MDCT transform codec, free of the hybrid filterbank compromise that limited MP3. Convert one representative file first and compare before batch-processing a large set.
What happens to the metadata in my OGG file?
This converter strips container metadata deliberately (the FFmpeg command runs with metadata mapping disabled) so exported files do not leak recording details. In the source, vorbis comments, the flexible key=value system shared with FLAC and Opus, plus METADATA_BLOCK_PICTURE for embedded cover art. Neither reaches an output written here: metadata mapping is disabled on every conversion, so comments and embedded artwork are dropped in both directions; none of it is transmitted anywhere because the file never leaves your browser.
Can I convert AAC back to OGG?
Yes. The reverse route exists as a separate tool. Bear in mind that round-tripping .ogg → .aac → .ogg is not a perfect undo when any lossy step is involved; keep your original if fidelity matters.