Sleeve — an MP3 tag editor with a record sleeve in it

	#	Title	Artist	Album	Year	BPM	Key	Length	File

Drop MP3s anywhere on this page Sleeve opens them locally, reads their real ID3v2 frames and writes them back.
Nothing is uploaded — there is no server to upload to.

click select · shift range · ⌘/ctrl add
double-click a cell edit it in place · enter play · space pause · ⌘Z undo
drag a column edge to resize it, double-click the edge to fit it

0 selected

Title

Artist

Album

Album art.

Genre

Track / of

Year

BPM / key

Comment

Type into a field to set it on every selected track at once. A field showing <multiple> is left alone until you touch it.

Cover

drop an
image here

The generated sleeve is drawn from the words in the tag itself — same artist and album, same sleeve, every time. Images are downscaled to 600×600 JPEG before they go into the file.

Measured

Press Listen & measure and Sleeve decodes each selected track, finds the beat by autocorrelating its onset envelope, and estimates the key from a chroma profile. Both can then be written into the TBPM and TKEY frames.

Raw frames

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