Music · 6 min
Keeping Metadata and Cover Art Intact on Downloaded Playlists
How ID3 tags, folder art and numeric prefixes work together to keep a downloaded music library usable a year later.
June 16, 2026
A downloaded playlist without metadata is a folder of files. A downloaded playlist with metadata is a library. The difference costs about ten minutes per batch and determines whether you can still find anything in six months.
Metadata lives in two places. Inside the file, as ID3 tags for MP3 or the equivalent atoms in M4A: artist, album, title, track number, year, and optionally embedded artwork. And outside the file, in the filename and folder structure. Both matter, because different players lean on different ones — media servers read tags, file managers and simple players read names.
Filenames are the more robust of the two, because nothing strips them. A two-digit track index at the front is the whole trick: 01_, 02_, 03_. Alphabetical sorting is universal, and numeric prefixes are what make alphabetical sorting produce the correct sequence. Without them, track 10 sorts between track 1 and track 2, permanently.
For tags, the efficient approach is batch-then-refine. Set album, artist and year once for the entire folder using any tag editor — MusicBrainz Picard, Mp3tag on Windows, Kid3 on Linux — then fix the handful of individual titles that came through with 'Official Video' or '[HD]' clinging to them. Editing a hundred files one at a time is unnecessary.
Cover art has an easy shortcut. Rather than embedding an image into every file, save the album image as folder.jpg in the directory. Plex, Jellyfin, foobar2000, VLC, Kodi and most stock Android players read it automatically. Embedding is still worth doing for files that will travel individually, but folder art covers the common case for free.
Source choice affects how much of this work you have to do. YouTube Music playlists carry structured artist and album fields, so the downloaded titles tend to be clean. The same songs on regular YouTube arrive as uploader-written titles full of decoration. Choosing the better source is the highest-leverage decision in the whole process.
One last habit: keep a plain text file in each folder recording the source playlist URL and the date you downloaded it. It is not metadata in the technical sense, but it answers the question you will actually ask later — where did this come from, and is there a newer version?