Free tool
Cover Tester
See your cover the way listeners will see it.
Cover Tester is a free tool that shows your cover art the way listeners will see it: at thumbnail sizes, in a playlist row, on a profile grid and in a story. It also runs quick checks for shape, size, contrast and brightness. Your image stays in your browser and is never uploaded.
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How it works
- Choose your cover or drop the image on the page. JPG, PNG or WebP, and square works best.
- Type the song title and the artist name to see them next to the cover.
- Look at each preview, then read the quick checks.
What it checks
- Shape
- streaming platforms want a square cover and crop anything else
- Size
- most distributors ask for 3000 px on the shortest side
- Contrast
- whether the cover stays readable at thumbnail size
- Brightness
- whether light or dark text will read best on top of it
Common questions
- What size should cover art be?
- Square, and most distributors ask for 3000 px on the shortest side. The tool reads your file and tells you if it is smaller.
- Is my image uploaded anywhere?
- No. Your browser reads the file on your device and it never leaves it.
- Which file types work?
- JPG, PNG and WebP.
- Why test a cover at small sizes?
- Most plays start from a thumbnail. If the cover still reads at the smallest size, it works.
- Is Cover Tester free?
- Yes. You subscribe to the UMMONTE newsletter with your email and the tool opens on this page.