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 M4A
Re-encoding .ogg audio as .m4a 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 MPEG-4 audio
Re-encoding .ogg audio as .m4a 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 .m4a file is an MPEG-4 container that holds only audio, most often AAC and occasionally Apple Lossless. Apple coined the .m4a extension so audio would not be confused with .mp4 video, and it remains the default for iTunes purchases, Apple Music downloads, and Voice Memos. For this route the practical draw is real tagging and artwork support, unlike bare .aac streams and gapless playback metadata for continuous albums, balanced against the extension hides whether the contents are lossy or lossless, muddying quality expectations, which is worth knowing before you commit a large batch.
Why convert OGG to M4A?
The practical trigger for this conversion is usually a mismatch: with .ogg, apple's Music app and iOS offer no native playback. Switching to .m4a buys you real tagging and artwork support, unlike bare .aac streams, which is why it is the better fit for managing music inside iTunes and Apple Music libraries. Because the conversion runs locally, trying it costs nothing but a few seconds of compute on your own machine.
OGG vs M4A at a glance
| Aspect | Ogg audio (.ogg) | MPEG-4 audio (.m4a) |
|---|---|---|
| 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 | an ISO base media container restricted to audio tracks, structurally a sibling of MP4 |
| Strongest at | shipping game audio assets without codec royalties | managing music inside iTunes and Apple Music libraries |
| Weak spot | apple's Music app and iOS offer no native playback | the extension hides whether the contents are lossy or lossless, muddying quality expectations |
| 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 | iTunes-style metadata atoms: title, album, artwork, composer, BPM, and the iTunSMPB gapless-playback data. A file converted here has an empty atom set, because metadata mapping is disabled on every route: title, album, artwork, composer and BPM are dropped, and no iTunSMPB is written, so gapless playback information does not survive |
Pick M4A as the output
Select .m4a in the output menu next to each file. The menu only offers targets this engine can genuinely produce, so if M4A 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 M4A 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 .m4a extension.
OGG to M4A questions, answered
Will converting OGG to M4A lose quality?
A second lossy step always costs a little, because ogg is lossy-oriented and m4a 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 .m4a.
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 M4A file work?
Browsers, Windows, Android, and every Apple device play AAC-based .m4a files without extra software. The ALAC-filled variety is slightly narrower, since some inexpensive devices decode only the AAC form. Novus Convert only ever writes the AAC form: the .m4a branch runs FFmpeg's AAC encoder at 55 to 192 kbps into the MPEG-4 muxer with the moov atom moved to the front for fast start, and there is no option to fill an .m4a with lossless audio instead. If that is what you want, pick the separate .alac target, which writes the same MPEG-4 structure with ALAC inside. Reading .m4a is broader, covering both fills, and every route is capped at 500 MB of input.
Will the M4A file be bigger or smaller than my OGG?
It depends on the content: an ISO base media container restricted to audio tracks, structurally a sibling of MP4. 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 M4A back to OGG?
Yes. The reverse route exists as a separate tool. Bear in mind that round-tripping .ogg → .m4a → .ogg is not a perfect undo when any lossy step is involved; keep your original if fidelity matters.