MP3 Tag Editor

About editing MP3 tags

Your music player does not read the file name. It reads the tags — a small block of text tucked inside the MP3 that says what the track is called, who made it, which album it came from, and what picture to show.

When those tags are missing or wrong, the file lands in your library as *Unknown Artist — Track 01*, with a blank grey square where the cover should be. The audio is perfect. The label on it is not.

This fixes the label. Drop the MP3 in, type the right answers, save.

What you can set

• Title, Artist and Album — the three that decide where a file lands in a library
• Album artist — the one that stops a compilation splitting into twenty one-track albums
• Track number, so an album plays in the right order instead of alphabetically
• Year and Genre
• Comment — anything you want to remember about the file
• Cover art — a JPG or PNG, shown by every player and phone

The sound is never touched

This is the important part. An MP3 keeps its tags in a block at the front of the file, before the audio starts. Editing them means replacing that block and copying every audio byte across untouched.

So nothing is decoded, nothing is re-encoded, and no quality is lost — no matter how many times you edit. That is not true of tools that run the file through a converter to change a title.

Cover art that actually shows up

Press Choose and pick a JPG or PNG. It is embedded in the file itself, so it travels with the MP3 — onto a phone, into a car, onto an old player — rather than sitting beside it as a separate image nothing reads.

A square picture around 600×600 is the sweet spot: sharp on a phone, and not so large that it doubles the file size. Remove strips the cover out entirely.

Files with no tags at all

Plenty of MP3s — recordings, exports, downloads from old sources — have no tag block whatsoever. The tool says so and starts you with empty fields. Fill them in and save, and the file gets a proper tag for the first time.

It also reads the ancient 128-byte tag at the *end* of very old files, so tags written in the 1990s still show up.

Nothing is uploaded

The MP3 is read and rewritten inside your browser, on your device. No file goes to a server, so there is no upload wait, no file size limit, and your music, recordings and audiobooks stay where they are.

What people use it for

• Fixing a library full of Unknown Artist
• Adding cover art so an album stops showing a grey square
• Correcting a misspelled artist or album that splits one album into two
• Setting track numbers so an album plays in order
• Tagging recordings, lectures and podcasts so they are findable later
• Setting the album artist on a compilation to keep it together
• Cleaning a comment field full of the name of whatever site the file came from

Good to know

• Tags are written as ID3v2.3, the version every player, phone and car stereo understands
• Accented and non-Latin characters are handled — a Japanese or Cyrillic title is stored correctly
• Name the saved file from the artist and title renames the download to Artist - Title.mp3, which is the tidy half of the job
• Clear every field writes an MP3 with no tags at all — useful for stripping identifying information before sharing a file
• Your original file is never modified; you save a new copy
• This handles MP3 specifically. For M4A, FLAC or OGG, convert first with Audio Converter
• For the same job on photos, use Image Metadata

How to use it

• Click Click to upload, or drop an MP3 onto the box
• The existing tags appear in the fields — edit whatever is wrong
• Press Choose under the cover to add or replace the artwork
• Tick Name the saved file from the artist and title if you want the file renamed too
• Press Save the MP3

Related tools

• Audio Converter — convert other formats to MP3 first
• Audio Trim — cut the file down before tagging it
• Audio Speed Changer — speed it up or slow it down
• Voice Recorder — record something and tag it here
• Image Metadata — the same idea, for photos
• Image Resizer — size a cover image before embedding it