Check your cover before your distributor does.
Drop your cover art in and see what a distributor or a store would send back: the shape, the size, the file, the colour, how sharp it is, its edges, and how it looks at 60 pixels in a list on a phone. Your picture never leaves this device. It is opened here, in the page, and nothing is uploaded or saved.
Check a cover
The file you would send your distributor, as it is. Each check says what it found and why it matters, and the cover is shown the three ways people meet it.
Six things only you can check
A machine can measure the pixels, not what they say. Distributors look at these by hand, and they are the usual reasons a cover comes back. Tick them off as you go: nothing is saved.
What the stores ask for
The rules distributors pass on from the stores, in one place. A cover that meets all of them is never the reason a release goes out late.
Square
Exactly as wide as it is tall. Any other shape is sent back.
3000 by 3000 or more
Apple Music's least, so the size to aim for. Bigger is fine.
JPG or PNG
The two every distributor and store takes. Not HEIC, WebP or a layered file.
RGB colour
The colour of screens. CMYK is for print, and its colours shift.
Sharp at full size
Not blown up from something smaller, and not blurred.
Edge to edge
No border, no frame, no padding to make it square.
Reads at 60 pixels
Most people meet it in a list on a phone, about 60 pixels wide.
Nothing that sells
No web addresses, handles or store logos on it.
Dots per inch do not matter. They are a printing setting: a digital cover is measured in pixels, so 72 or 300 changes nothing on a screen. Your distributor's own help pages have the last word on their limits.
More, free
The other free tools
What streams pay, a check for the codes your money travels on, who pays you for what, and the red flags in a contract.
Open LearnWhat a cover should cost
The handbook's ranges for artwork, and why to ask the designer for the layered source file.
Read: what things actually costThe Release Planner
The artwork is one step of a release. Every step with its date and the reason it is there, on an example single.
See the Release Planner (free account)