Audio File Metadata - What It Is, Where It's Stored, and How to Edit It

Audio file metadata is the descriptive and technical information stored alongside the sound data. It covers the title, artist, album, track number, and cover art, as well as properties such as duration, bitrate, and sample rate. Editing it leaves the recorded sound untouched.

Players, car stereos, and music apps read these fields to label and sort tracks. With empty fields, a song shows up as "Unknown Artist" with a blank cover.

What Is Audio File Metadata?

A typical digital audio file holds two kinds of data: the encoded sound and a set of fields that describe it. In music files, these descriptive fields are called tags, and media players, file browsers, and tag editors read them without decoding any audio.

Music apps sort libraries by these tags, home media servers build their browse menus from them, and car stereos show them on the dashboard.

Example: a song saved as Track01.flac with empty tags appears in a player as "Track01" under Unknown Artist. Add a title, artist, album, track number, and embedded cover to the same file. The player then places it in the correct album, in the correct position, with the artwork on screen.

Tags are stored separately from the file name and from file system dates. A player uses the file name only when the Title tag is empty, and the created or modified dates are set by the operating system.

Types of Audio File Metadata

Audio metadata falls into three groups. Descriptive tags identify the recording and can be edited by anyone. Technical properties, which come from how the audio was encoded, remain read-only in a tag editor. Identifier and rights fields connect a recording to catalogs, labels, and royalty systems.

Descriptive Tags

Descriptive tags hold the text and images that players display. The table lists the fields that nearly every player and tag editor supports.

Album Artist controls whether a compilation stays together. A compilation with 15 track artists and no Album Artist often splits into 15 one-track albums. A shared value, such as "Various Artists," puts them back on one album.

Technical Properties

Technical properties describe the audio stream: codec, bitrate, sample rate, bit depth, channels, and duration. Players read these values from the encoded audio, and tag editors show them as read-only, so a 320 kbps MP3 stays at 320 kbps after any tag edit.

A different bitrate or sample rate requires an audio converter, which re-encodes the sound into a new file. Converting an MP3 to a higher bitrate adds file size and restores none of the detail lost in the original encoding.

Identifier and Rights Data

Identifier fields link a recording to outside databases. The International Standard Recording Code (ISRC) identifies one specific recording. The release barcode (UPC or EAN) identifies the product, and MusicBrainz IDs connect the file to an entry in the open MusicBrainz database. Copyright, publisher, and label fields record ownership.

Musicians who release through a distributor enter this data in the distributor's upload form. DistroKid, for example, states that streaming services use the details from its upload form and disregard metadata embedded in the audio file, including ISRC codes.

Where Metadata Is Stored

Metadata is stored in a dedicated block within the audio file, separate from the audio data. Each file format defines its own block structure, called a tag format. A tag editor writes one structure into an MP3 file and a different one into a FLAC file.

ID3v1 dates from 1996 and occupies the last 128 bytes of an MP3. It stores only title, artist, and album (30 characters each), a year, a comment, and a numeric genre code. Its character set can't hold Cyrillic, Chinese, or Japanese text.

ID3v2 adds support for Unicode, artwork, lyrics, and long-text fields. Current tag editors write ID3v2 and keep ID3v1 only as an optional copy for very old players.

Does WAV Support Metadata?

WAV files support metadata with a limited set of fields. A WAV file keeps its data in labeled sections called chunks. The standard RIFF INFO chunk holds a short list of text fields, such as title, artist, genre, and creation date, and has no standard slot for cover art.

Support on the playback side varies. Apple Music doesn't read tags from WAV files at all. It saves edits to WAV tracks in its own library database, so the details disappear when the files are moved to another computer or library.

MusicBrainz Picard and Kid3 can also write ID3 tags to a WAV file, including artwork. Test the result on your own device, because players that ignore that block still show nothing.

Broadcast Wave Format (BWF), used in radio, film, and field recording, adds a BEXT chunk with a description, the originator, the recording date and time, and a timecode reference. The free tool BWF MetaEdit edits these fields.

For a music library, FLAC and AIFF keep the same lossless audio as WAV and store full tags with artwork.

ID3v2.3 vs. ID3v2.4

ID3v2.4, finalized in 2000, supports UTF-8 text and several values inside one field, such as two genres. ID3v2.3, published a year earlier, still has wider device support.

Windows File Explorer has a long record of problems reading and saving ID3v2.4 tags. Tagging guides for Pioneer NEX head units and owner reports for Ford SYNC describe a similar issue: tags and artwork appear only after conversion to ID3v2.3.

Choose ID3v2.3 if your music plays on Windows, in a car, or on an older portable player. Mp3tag, Kid3, and MusicBrainz Picard let you set the version, and Kid3 converts existing tags to that version.

How to View Audio File Metadata

Windows and macOS show the basic tags of an audio file without extra software. A tag editor or a file analyzer, such as MediaInfo, shows every field and the exact technical values.

On Windows

File Explorer shows tags and audio properties in the file's Properties window:

1. Right-click the file in File Explorer and choose Properties.
2. Open the Details tab to see Title, Contributing artists, Album artist, Album, Year, Genre, Length, and Bit rate.
3. To compare an entire folder, switch File Explorer to the Details view, right-click any column header, and add columns such as Album, Genre, or Bitrate.

Windows labels the Artist tag as "Contributing artists" and shows the Album Artist tag under its own name.

On Mac

macOS splits this information between Finder, QuickTime Player, and Apple Music:

1. Select the file in Finder and press Command-I. Expand More Info to see the title, duration, audio channels, and sample rate; WAV and AIFF files also list bits per sample.
2. For the bitrate and codec, open the file in QuickTime Player and choose Window > Show Movie Inspector.
3. For songs in your Apple Music library, select a track and choose Song > Get Info.

On iPhone and Android

Phones show little tag information by default. The iPhone Music app has no Get Info window, and Android file managers differ in what they display. A tag editor app gives full access on either platform: Kid3 has an Android version, and the App Store lists several tag editors for iPhone.

With Dedicated Tools

Dedicated tools show every stored field, including ones the operating system hides:

• MediaInfo, available for Windows, macOS and Linux, lists technical properties and embedded tags, including Broadcast Wave data.
• Mp3tag, foobar2000 and Kid3 display every tag field and let you edit it.
• ExifTool, a free command-line program, reads metadata from most common audio formats, including bext chunks in WAV files.

Online metadata viewers run in a browser, and many of them upload the file to their own server. Check how a viewer handles files before you use it on private recordings.

How to Add or Edit Audio File Metadata

Editing metadata rewrites only the tag block of a file and copies the audio data unchanged, so sound quality stays the same. You need a tag editor that supports your file format, and the table compares five common options.

Edit Tags in a Single File

Both Windows and macOS can edit a file without extra software. To edit MP3 metadata on Windows, use the Properties window in File Explorer:

1. Right-click the file, choose Properties, and open the Details tab.
2. Click the value next to Title, Contributing artists, Album, or another field and type the new text.
3. Click Apply to write the changes into the file.

File Explorer edits MP3 tags and only partially supports FLAC and WAV tags. In Windows 11, the Details pane on the right side of File Explorer is read-only, so edits are made in the Properties window.

On a Mac, Apple Music edits the songs in its library:

1. Select the song and choose Song > Get Info, or press Command-I.
2. Click Details, change the fields, and press Return.

Select several songs first to change a shared field, such as Genre, on all of them at once. By default, Apple Music also renames the file on disk after you edit its details. To stop this, open Music > Settings > Files and clear "Keep Media folder organized."

Batch-Edit a Music Library

Batch editing fixes an entire album or library in one pass, and the same steps add metadata to MP3 files that lack it. MusicBrainz Picard automatically fills in tags from an online database, while Mp3tag is suited for manual changes across many files.

To tag albums automatically in MusicBrainz Picard:

1. Drag a music folder into the left pane of Picard.
2. Select the files and click Cluster to group them into albums.
3. Select a cluster and click Lookup. For files with no tags, click Scan: Picard identifies each track by its acoustic fingerprint through the AcoustID service.
4. Check the matched release in the right pane, including country, date, label, track count, and cover.
5. Click Save to write the tags into the files.

To edit a batch of files by hand in Mp3tag:

1. Drag the album folder into the Mp3tag window.
2. Select all tracks of the album and type the shared values, such as Album, Album Artist, Year, and Genre, in the tag panel on the left. Fields that differ between tracks show <keep> and stay unchanged.
3. For untagged files with descriptive names, use Convert > Filename - Tag to copy parts of each file name into tag fields.
4. To fill a complete release at once, use Tag Sources > MusicBrainz or Discogs, which adds track titles and cover art from the database.
5. Press Ctrl+S (Command-S on Mac) to save.

Add Metadata to WAV Files

The method for adding metadata to WAV files depends on where they will play:

1. Write tags with MusicBrainz Picard or Kid3, which can store RIFF INFO fields and an ID3 block with artwork. Test playback on the target device afterward.
2. Convert the files to FLAC or AIFF for a lossless library with complete tags embedded in each file.
3. For broadcast and archive deliveries, edit the BEXT chunk with BWF MetaEdit.

How to Fix Missing or Inconsistent Metadata

Library problems usually trace back to five causes: empty tags, spelling variations, split albums, missing or unreadable cover art, and players that keep showing old data. The table below helps clean up inconsistent music metadata one symptom at a time.

Two habits prevent these problems from recurring: one spelling per artist on every track, and a backup before each batch edit, since a single incorrect pattern can overwrite thousands of files.

Do Audio Recordings Contain Personal Metadata?

Recordings from phones and portable recorders usually contain personal metadata: the recording date and time, the app or device that made the file, and sometimes a location-based name. Field recorders that save Broadcast Wave files also store the recorder model and recording time in the bext chunk.

Voice Memos on iPhone can name each recording after the street or place where you made it, and a shared file keeps that name. Turn this off under Settings > Apps > Voice Memos > Location-based Naming (Settings > Voice Memos on older iOS).

To remove metadata from an MP3 or another audio file before you publish it or send it outside your organization, use one of three methods:

1. In Mp3tag, select the files and choose File > Remove tag (Ctrl+R on Windows). This deletes every tag, including artwork.
2. In Windows, open Properties > Details and click Remove Properties and Personal Information. This works for formats Windows can write, such as MP3.
3. In an audio editor, export a new copy of the recording and clear the metadata fields in the export dialog.

File system dates, such as creation and modification dates, sit outside the tag block, so a tag remover leaves them in place. On Windows, copying the file to another folder gives the copy a new creation date.

Key Takeaways

Audio file metadata stores descriptive tags, technical properties, and identifiers within the file, and editing it leaves the sound unchanged. MP3 files store them as ID3 tags; FLAC, OGG, and Opus files use Vorbis comments; M4A files use MP4 atoms.

The file format determines which devices can read your tags. WAV has a few basic text fields that many players skip, so FLAC or AIFF is better suited to a tagged lossless library. For MP3, ID3v2.3 has the widest support on Windows, car stereos, and older players.

Split albums and out-of-order tracks usually need changes in only a few fields. One shared Album Artist compiles a compilation. Complete track and disc numbers restore the order, while a single spelling per artist prevents duplicate artist entries.

Before you share a phone recording publicly, remove its metadata, as it can reveal when and where it was made and which device was used.