Organize Your Audio Library With ID3 Tags

Open a folder of downloaded audio and you often find a mess: track01.mp3, audio (2).mp3, and an Unknown Artist in your player. The sound is fine; the labels are missing. ID3 tags are the little blocks of text inside an MP3 that fix this, and a bit of tagging work pays off every time you search your library.

What ID3 tags are

An ID3 tag is metadata stored inside the audio file itself. Players read it to display information. The most useful fields are:

• Title. The name of the track or episode.
• Artist. The creator, or the show name for podcasts.
• Album. A collection, such as a season or project.
• Year. When it was released or recorded.
• Track number. Controls play order within an album.
• Genre. A loose category used for filtering.
• Comment. Open text for notes, such as license and source.
• Cover art. An embedded image displayed in players and lock screens.

Version ID3v2.3 and 2.4 are the common ones, and nearly every modern player reads at least v2.3.

What a converted file contains

A file produced by the converter is a plain MP3 and may carry little or no metadata. Do not expect clean tags automatically. Plan a few minutes after downloading to label it before it joins your library. Files are deleted from the server after one hour, so the local copy is the one to tag.

A tagging scheme that works

Decide rules once and keep to them.

1. Title: descriptive and short, such as Morning Tide or Episode 14 - River Talks.
2. Artist: the real creator. For Creative Commons tracks, use the artist's name exactly.
3. Album: the project, season or collection.
4. Year: the original year, not the date you downloaded.
5. Comment: license and source, for example CC BY 4.0 plus the page address.
6. Cover: a square image, at least 500 pixels wide, kept below a few hundred kilobytes.

The comment field is a neat place to store attribution details, which makes writing credits later much easier. Our credit guide in the blog shows what to record.

Tools

Several kinds of tools can edit tags:

• Tag editors for desktop systems, many of them open-source, show a table of files and let you edit them together.
• Built-in options in your music player, usually under Get Info or Properties.
• Command-line utilities for people who want scripts.
• Online editors for a one-off file, though local tools are safer for private recordings.

Bulk editing

When you have dozens of files, do not tag each by hand.

• Select all files from one album and set Artist, Album and Year once.
• Use a pattern to fill the title from the file name, such as turning 01 - Title.mp3 into the tag.
• Renumber tracks automatically.
• Apply one cover image to the whole album.
• Rename files from tags afterwards, so file names and tags agree.

File names still matter

Tags help players, while file names help you in a file manager. Use a shape like 2026-09-18_show_ep14_guest.mp3, with no spaces or special characters. Both labels together make a library that works anywhere.

Fixing common problems

Strange characters in titles. An old encoding is at fault. Resave the tag as UTF-8 in your editor.

Wrong order. Add track numbers, with leading zeros so 10 sorts after 9.

Cover art missing on one device. Some players ignore very large images. Resize to a moderate size.

Duplicate files. Sort by title and duration to find them.

Back up the library

Tags are valuable work. Keep two copies of the finished library, one local and one elsewhere, and test a restore once in a while.

Rights note

Use the service only for audio whose rights you hold, or that is Creative Commons licensed or royalty-free and used within its terms. Videos can be up to 15 minutes, and you can run 10 conversions per IP per hour. The terms of use explain more.