How to edit MP3 tags on any device

A song can have a perfectly sensible filename and still appear as “Unknown artist” in your music player. That is because players usually organize music using information embedded inside the file. You can fix those MP3 tags in a browser, including the artist, album cover and lyrics, without changing how the recording sounds.

What MP3 tags actually store

ID3 tags are metadata attached to an MP3. Common fields include title, artist, album, year and track number. More capable tag versions can also store artwork, composer credits and lyrics. A filename and an embedded title are separate: renaming track01.mp3 does not necessarily update the title your player displays.

ID3v1 is an older, limited format with short text fields and no embedded artwork. ID3v2.3 supports richer information and has broad player compatibility. ID3v2.4 is newer, with some different encoding and field conventions, but support varies among older devices and software.

The MP3 Tag Editor saves ID3v2.3 for broad compatibility. It rewrites the tag while copying the audio frames untouched, so there is no re-encoding or audio quality loss. Files up to 200 MB are supported, and processing happens locally in your browser with no upload, signup or watermark.

How to edit MP3 tags in your browser

For a straightforward title-and-artist correction, the actual editing can take under a minute. Finding the right artwork or checking credits may take longer.

1. Select your MP3. Open the MP3 Tag Editor and choose the local file you want to update.
2. Fix the essentials. Enter Title, Artist and Album first. These are the fields most likely to affect browsing and search in a player.
3. Fill in the other credits. Add Album artist, Year, Track number, Genre and Composer where appropriate. Use consistent spelling across an album.
4. Add artwork and lyrics if needed. Select a JPG or PNG front cover and paste plain lyrics into the lyrics field.
5. Save the edited file. Download the result, keeping the original until you have checked the new copy in your player.
6. Import the saved copy. Make sure the player is reading the file you just exported rather than the older version already in its library.

For compilations, Artist identifies the performer of an individual track; Album artist can identify the release as a whole. Consistent album-level values help prevent one compilation from appearing as several separate albums.

Windows, Mac and Chromebook

Use the browser’s file picker to select an MP3 from your computer. When saving, check your Downloads folder or the destination you selected. Open the exported copy to confirm that the new information appears.

Android and iPhone

On Android, choose the file through the system file picker. On iPhone, make the MP3 available in Files, then select it from the browser’s file chooser. An MP3 stored in iCloud Drive may need to download to the device first.

The browser workflow edits a file you can access. It cannot directly rewrite tracks inside a streaming service’s protected library. Download locations and the steps for opening the saved copy vary by browser and player.

Add album art that players can display cleanly

A square JPG of at least 500 × 500 pixels is a practical starting point. PNG also works. Choose a clear image with some space around important details, since players show covers at many sizes and may crop their edges.

Use artwork you own or have permission to use. A huge image rarely helps a tiny player thumbnail and makes the file larger. If a particular device struggles with a cover, try a smaller square JPG and re-import the saved MP3.

The editor embeds the image as the front cover. This travels with the file, unlike a separate picture sitting beside it in a folder. Embedding a cover is useful for your own demos, DJ references or exports from the Nightcore Maker.

Embed lyrics, with the right expectations

Paste the words into the unsynced lyrics field, keeping line breaks readable. Unsynced lyrics are plain text: they do not include timestamps, move with playback or highlight the current line.

Some players display embedded lyrics and others ignore them. If lyrics do not appear, first check whether your player supports unsynced ID3 lyrics. Repeatedly saving the tag cannot add a display feature the player does not have.

Keep personal notes separate from the actual lyric text when possible. Someone opening the file later should be able to tell which words belong to the song.

Why does my player still show the old information?

Music apps often cache metadata in their own library database. A corrected file can therefore contain the right tags while the player keeps showing an older title or cover.

Try these checks in order:

• Confirm that you opened the exported file, including its folder and filename.
• Refresh or rescan the player’s library if it offers that option.
• Remove the old library entry and import the edited copy again, keeping a backup first.
• Check whether the player uses its own artwork lookup or a separate image from the album folder.

If another tag reader shows your changes, the remaining issue is likely how that player updates its library.

When a desktop tag editor makes more sense

For a few individual files, browser editing keeps the task simple. For hundreds of albums, desktop tools such as Mp3tag or MusicBrainz Picard may be more practical because they offer workflows for larger collections, including batch editing or matching releases against metadata databases.

Review automated matches before saving, especially for live recordings, remasters and alternate editions. Keep an untouched backup of a large library before making bulk changes. For other small audio tasks, the full tools list provides a place to choose your next step.