What are Vorbis comments?

Vorbis comments are the metadata tags stored in OGG audio, written as KEY=VALUE pairs such as TITLE=Song or ARTIST=Band. Unlike ID3 in MP3, the field names are free-form UTF-8 text, so files may contain custom tags too.

How does the parser find the tags?

It walks the OGG container's pages — each begins with the OggS capture pattern and a segment table — concatenates the payloads, then locates the Vorbis comment header (byte 0x03 followed by 'vorbis') and reads the length-prefixed comment strings.

Why might no tags appear?

The file may be untagged, may use a non-Vorbis codec inside OGG (such as Opus, which uses a similar but different OpusTags header), or may be truncated. The vendor string still shows if the comment header was found.

Is my audio uploaded?

No. Only the first 256 KB of header bytes are read with DataView, and parsing happens entirely in your browser. Nothing is sent to a server.

Does it handle Unicode tags?

Yes. Vorbis comments are UTF-8 by specification, and the tool decodes them with TextDecoder, so accented characters and non-Latin scripts display correctly.

OGG / Vorbis Metadata Viewer

Read the tags inside an OGG Vorbis file

An OGG metadata viewer shows the title, artist, album, date, and any custom tags embedded in an OGG Vorbis audio file, plus the encoder that produced it. It is handy for checking a music library, debugging a tagging script, or confirming what an encoder wrote — all without uploading the audio.

How it works

OGG is a container of pages. Each page begins with the four-byte capture pattern OggS, a 27-byte header, and a segment table whose byte values sum to the page’s payload length. The tool walks these pages and concatenates their payloads into the logical bitstream.

Within that stream it searches for the Vorbis comment header packet, identified by the byte 0x03 followed by the ASCII string vorbis. The header then follows the Vorbis I layout, all little-endian: a 32-bit vendor length and vendor string, a 32-bit comment count, and for each comment a 32-bit length followed by a KEY=VALUE UTF-8 string. Each string is split on the first = into a tag name and value.

Tips and notes

Common keys are TITLE, ARTIST, ALBUM, DATE, GENRE, TRACKNUMBER, and ALBUMARTIST, but any custom key is valid and will be shown.
OGG Opus files use a similar container but an OpusTags header rather than the Vorbis comment header, so this Vorbis-specific viewer may not find tags in them.
The vendor string identifies the encoder (for example Xiph.Org libVorbis), which can help track down how a file was produced.
Only the file’s header region is read, so even large tracks are parsed instantly without loading the whole file.