Add your MP4 file
Drop one or more .mp4 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.
MP4 to OGG
Pulling the soundtrack out of a .mp4 video into .ogg audio keeps what you can hear and drops the picture entirely. 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 MP4 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 MP4 video to Ogg audio
Pulling the soundtrack out of a .mp4 video into .ogg audio keeps what you can hear and drops the picture entirely. An .mp4 file is a multimedia container that bundles compressed video, audio, subtitles, and chapter data into a single stream-friendly package. It is the default delivery format for nearly every phone, camera, and video platform, which makes .mp4 the safest target when a clip has to play everywhere.
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. For this route the practical draw is patent-free from its first release and strong quality at mid-range bitrates, balanced against apple's Music app and iOS offer no native playback, which is worth knowing before you commit a large batch.
Why convert MP4 to OGG?
The usual reason to take .ogg audio out of a .mp4 file is that only the sound matters: a talk, interview, song, or podcast segment. Keeping the video stream would waste storage, and a dedicated audio file is easier to trim, tag, and play. On the source side, fewer track, attachment, and chapter features than Matroska; on the target side, the payoff is patent-free from its first release, which is exactly what you want for shipping game audio assets without codec royalties.
MP4 vs OGG at a glance
| Aspect | MP4 video (.mp4) | Ogg audio (.ogg) |
|---|---|---|
| Format type | Container: quality depends on the codecs and settings inside | Lossy: discards detail it judges invisible to shrink files |
| How it stores data | typically carries H.264/AVC or H.265/HEVC video with AAC audio, though the box structure also accepts AV1, MP3, and timed-text tracks | vorbis is an MDCT-based lossy codec tuned through a quality scale (-q) rather than fixed bitrates |
| Strongest at | publishing video to the web, social media, or a client who has not specified a format | shipping game audio assets without codec royalties |
| Weak spot | fewer track, attachment, and chapter features than Matroska | apple's Music app and iOS offer no native playback |
| Metadata | iTunes-style metadata atoms (title, artist, cover art) plus XMP and per-track language tags; ID3 is not native to the container. A conversion here writes none of it. Every media command this app runs disables metadata mapping, so title, artist, cover art, XMP and per-track language tags are dropped, and because only the default video and audio streams are selected, chapters, subtitle tracks, timecode tracks and any additional audio languages go with them | 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 |
Pick OGG as the output
Select .ogg in the output menu next to each file. The menu only offers targets this engine can genuinely produce, so if OGG is selectable, the route is real and validated.
Convert on your device
Press Convert. A WebAssembly FFmpeg build demuxes the audio track and re-encodes it locally; the video stream is simply discarded.
Verify and download
Each result is checked before the download unlocks: where OGG 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 .ogg extension.
MP4 to OGG questions, answered
Will converting MP4 to OGG lose quality?
Since mp4 is container-oriented and ogg is lossy-oriented, the conversion preserves the source content exactly as stored; no additional compression pass is applied beyond what .ogg itself requires.
Is it private to convert MP4 files here?
Yes. The .mp4 file is processed inside your browser tab and never uploaded. A WebAssembly FFmpeg build demuxes the audio track and re-encodes it locally; the video stream is simply discarded. Close the tab and the file is gone from memory.
Where will the OGG file work?
Chrome, Firefox, and Edge have decoded Ogg Vorbis for many years, and Android plays it natively, while Safari and iOS remained the notable holdouts until only recently. Dedicated players such as VLC and foobar2000 cover the desktop everywhere. Novus Convert writes .ogg with libvorbis in variable-bitrate mode, mapping the quality slider onto the encoder's 0-to-8 quality scale, and the .ogg it produces is always Vorbis: an Ogg container holding Opus or FLAC is not something this target can make, and the separate .opus and .flac targets exist for those. Reading .ogg requires the OggS capture pattern at the head of the file, and input is capped at 500 MB.
Will the OGG file be bigger or smaller than my MP4?
Much smaller: the video stream is usually 80–95% of a .mp4 file's weight, and it is discarded entirely. The remaining audio is re-encoded at the bitrate implied by your quality setting.
What happens to the metadata in my MP4 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, iTunes-style metadata atoms (title, artist, cover art) plus XMP and per-track language tags; ID3 is not native to the container. A conversion here writes none of it. Every media command this app runs disables metadata mapping, so title, artist, cover art, XMP and per-track language tags are dropped, and because only the default video and audio streams are selected, chapters, subtitle tracks, timecode tracks and any additional audio languages go with them; none of it is transmitted anywhere because the file never leaves your browser.