Why extract OGG instead of MP3 or AAC?

Three reasons: (1) Vorbis is royalty-free — game engines (Unity, Unreal, Godot) ship Vorbis decoders by default to avoid MP3 patent fees historically; (2) Wikimedia Commons mandates royalty-free audio (OGG or Opus); (3) at low-to-medium bitrates (96-160 kbps) Vorbis sounds better than MP3 at the same size. AAC is technically better still, but its licensing isn't always acceptable.

Yes — this is a lossy-to-lossy re-encode (AAC → Vorbis). At our default quality 5 (~160 kbps VBR), the audible difference from the MP4's AAC source is essentially zero on normal listening. If you need a true archival copy, extract WAV instead.

What encoder settings do you use?

libvorbis at quality 5 (roughly 160 kbps VBR — Vorbis quality 5 is widely considered transparent for general audio). Sample rate is preserved (typically 48 kHz from video, 44.1 kHz from music).

Will tags / metadata transfer?

Title, artist, album, and year tags from MP4's iTunes-style metadata are mapped to Vorbis comments in the OGG file. Album art is dropped — Vorbis supports embedded pictures via METADATA_BLOCK_PICTURE but support across players is patchy.

Are my MP4 files uploaded?

No. FFmpeg WebAssembly demuxes the MP4 and re-encodes audio to Vorbis entirely inside your browser tab.

Convert MP4 to OGG

Extract the audio track from MP4 video files as Ogg Vorbis directly in your browser. Vorbis is the royalty-free counterpart to MP3 — used in Spotify (historically), Wikimedia, and almost every game engine (Unity, Unreal, Godot) that wants to avoid MP3 licensing. No upload needed.

Drag 'n' drop files here, or
click to select files

.mp4

OGG

Drop your files and click Convert to get OGG

Files never leave your device — 100% browser-based

//when_to_use

When to Convert MP4 to OGG

Extracting OGG soundtrack files from MP4 game cutscenes for use as Unity / Unreal / Godot audio assets
Pulling OGG audio from MP4 lecture recordings for Wikimedia Commons uploads (which mandate royalty-free codecs)
Converting MP4 podcast recordings to OGG for HTML5 <audio> embeds on patent-sensitive academic / non-profit sites
Extracting OGG background music from MP4 royalty-free music videos for inclusion in open-source game projects
Re-encoding MP4 interview audio to OGG for distribution alongside transcripts on Open Educational Resources platforms

//comparison

MP4 vs OGG

Property	MP4	OGG
Type	Video container	Audio-only container
Audio codec	AAC (MPEG-licensed)	Vorbis (royalty-free)
Default bitrate	128-256 kbps	~160 kbps VBR
Game engine support	Limited (need extraction)	Universal (Unity, Unreal, Godot)
Royalty / patent	MPEG-LA / Via licensing	Fully royalty-free
Best for	Watching, streaming	Games, Wikimedia, HTML5 <audio>

//how_it_works

How It Works

Drop your MP4 files

Drag and drop or pick .mp4 files. First conversion loads FFmpeg WASM (~30MB).

FFmpeg demuxes MP4

FFmpeg WASM parses ISOBMFF boxes, isolates the audio track, and ignores the video stream.

Decode AAC, encode Vorbis

AAC audio is decoded to PCM, then re-encoded with libvorbis at quality 5 VBR (~160 kbps) and packaged into Ogg pages.

Download OGG files

OGGs play in Firefox, Chrome HTML5 <audio>, VLC, foobar2000, and every major game engine's audio system.

// under the hood

MP4 is an ISOBMFF container with AAC audio (lossy). OGG is the Ogg container carrying Vorbis audio (lossy, royalty-free). Our converter uses FFmpeg WASM to demux MP4, decode the AAC audio to PCM, then re-encode with libvorbis at quality 5 (≈160 kbps VBR) and wrap it in Ogg pages. No video processing happens.

//faq

Frequently Asked Questions

Why extract OGG instead of MP3 or AAC?: Three reasons: (1) Vorbis is royalty-free — game engines (Unity, Unreal, Godot) ship Vorbis decoders by default to avoid MP3 patent fees historically; (2) Wikimedia Commons mandates royalty-free audio (OGG or Opus); (3) at low-to-medium bitrates (96-160 kbps) Vorbis sounds better than MP3 at the same size. AAC is technically better still, but its licensing isn't always acceptable.
Will quality drop?: Yes — this is a lossy-to-lossy re-encode (AAC → Vorbis). At our default quality 5 (~160 kbps VBR), the audible difference from the MP4's AAC source is essentially zero on normal listening. If you need a true archival copy, extract WAV instead.
What encoder settings do you use?: libvorbis at quality 5 (roughly 160 kbps VBR — Vorbis quality 5 is widely considered transparent for general audio). Sample rate is preserved (typically 48 kHz from video, 44.1 kHz from music).
Will tags / metadata transfer?: Title, artist, album, and year tags from MP4's iTunes-style metadata are mapped to Vorbis comments in the OGG file. Album art is dropped — Vorbis supports embedded pictures via METADATA_BLOCK_PICTURE but support across players is patchy.
Are my MP4 files uploaded?: No. FFmpeg WebAssembly demuxes the MP4 and re-encodes audio to Vorbis entirely inside your browser tab.

//related_converters

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Convert MP4 to OGG

When to Convert MP4 to OGG

MP4 vs OGG

How It Works

Drop your MP4 files

FFmpeg demuxes MP4

Decode AAC, encode Vorbis

Download OGG files

Frequently Asked Questions

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