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Songs listed as “Unknown Artist,” albums split across your library and missing artwork all come down to metadata. Open an MP3 or M4A file to see its existing tags and cover instantly, fix them, and save a copy with the audio left exactly as it was.
Processing locally on your device
Overview
ID3 is the metadata standard for MP3 files. The original ID3v1 was a fixed 128-byte block at the end of the file, with 30-character fields and no artwork. ID3v2 sits at the start of the file and uses flexible frames: TIT2 for the title, TPE1 for the artist, TALB for the album, TPE2 for the album artist, TRCK for the track number, TYER or TDRC for the year, TCON for the genre, COMM for comments and APIC for pictures. This editor reads ID3v2.2, 2.3 and 2.4 as well as ID3v1, and fills any blank fields from an old v1 tag if both exist.
When you save an MP3, the tag is written as ID3v2.3, the version with the widest support in car stereos, older iPods, Windows Explorer and most players, with the comment stored as a proper COMM frame. M4A files, which include iTunes purchases and most AAC audio, store metadata in MP4 atoms instead (©nam, ©ART, ©alb, aART, ©day, trkn, ©gen, ©cmt and covr), and the editor writes those natively.
Reading happens instantly in JavaScript, so you see the current tags and artwork the moment the file opens. Saving uses FFmpeg (a one-time 31 MB WebAssembly download) in stream-copy mode. The audio frames are copied byte for byte, nothing is decoded or re-encoded, and even a long file usually saves within seconds. Only the fields you change are rewritten. Other tags already in the file, such as lyrics, composer, ReplayGain values or encoder information, are carried over, and clearing a field removes that tag.
Cover art can be added, replaced or removed. JPEG and PNG images are embedded exactly as they are; other image types like WebP are converted to JPEG first. Square images between 500×500 and 1400×1400 pixels are the common choice, since they look sharp on phones and car displays without adding much to each file. The editor shows the current cover’s format, file size and pixel dimensions so you can spot oversized or low-resolution artwork.
| Field | MP3 (ID3v2.3 frame) | M4A (MP4 atom) |
|---|---|---|
| Title | TIT2 | ©nam |
| Artist | TPE1 | ©ART |
| Album | TALB | ©alb |
| Album artist | TPE2 | aART |
| Year | TYER | ©day |
| Track | TRCK (e.g. 3/12) | trkn |
| Genre | TCON | ©gen |
| Comment | COMM | ©cmt |
| Cover art | APIC | covr |
Open an MP3 or M4A file. Its current tags and cover art appear immediately.
Edit the title, artist, album, album artist, year, track, genre or comment.
Click Add cover or Replace to choose an image, or Remove to delete the artwork.
Click Save tags. The audio is copied without re-encoding.
Download the updated file and replace the original in your library.
Use cases
Correct misspelled artist names, fill in missing album artists and add track numbers like 3/12 so albums sort properly and stop splitting into several entries in your music player.
Embed a cover image so it shows on your phone’s lock screen, car display and smart speakers, or remove a wrong or oversized picture that came with a download.
Set the title, artist, year and artwork on an MP3 before you share it, so listeners see proper information instead of a file name.
Give M4A voice memos and interview recordings meaningful titles, dates and comments, so they are easy to find later in any player.
Pro tips
Answers to common questions about the id3 tag editor.
No. Tags live in a separate part of the file and the audio frames are stream-copied without decoding or re-encoding, so the music is bit-for-bit identical.
ID3v2.3. It is supported by practically every player, car stereo and operating system. ID3v2.4 files are read correctly and saved as v2.3, and an old ID3v1 block is replaced by the new v2.3 tag.
Not in this editor, which handles MP3 and M4A. FLAC and OGG use Vorbis comments and WAV uses RIFF INFO chunks. You can set tags for those formats indirectly by converting with the Audio Converter, which carries existing tags across.
Some older players only understand JPEG artwork, and some cache artwork by album. Saving with a square JPEG cover and re-adding the file to the library fixes most cases.
No. Only the fields you change are rewritten. Lyrics, composer, disc number, ReplayGain and other tags are carried over. If you clear a field, that one tag is removed.
No. ToolEnhancer processes files on your own device inside the browser. They are never sent to, stored on or seen by our servers.
Yes. The id3 tag editor is free to use with no sign-up, no watermarks and no daily limits.