Why Ask for a PNG at All
YouTube stores every cover as a JPG, so a PNG version does not exist until something creates it. People look for one anyway, and usually for a good reason: the file is about to be edited.
JPG is a lossy format. Each time an image is opened, changed and saved again as JPG, a little more detail is thrown away — and the damage lands first on hard-edged text and flat colour blocks, which is exactly what thumbnails are made of. Convert once to PNG at the start of the work and every save after that is lossless.
What the Conversion Does and Does Not Do
Converting recovers nothing. The compression artefacts already baked into the JPG stay in the PNG, pixel for pixel. Anyone promising a “quality improvement” by changing format is describing something that cannot happen.
What changes is the future. From the PNG onward, crops, resizes, colour adjustments and repeated saves cost nothing in quality. If the image is going into a design file, a slide deck or a print layout, that is worth the larger file size.
Where PNG Is the Wrong Choice
If you are only saving a reference image, uploading it somewhere that re-compresses it anyway, or sending it in a message, PNG buys you nothing but a heavier file. Use the plain JPG download from the main extractor instead — it is the untouched original, which is always the best starting point when no editing is planned.
PNG also does not help with transparency here. YouTube covers are fully opaque rectangles; there is no alpha channel to preserve. Transparency only becomes relevant if you cut something out yourself afterwards, which is a design step, not a conversion one.
Getting the Best Source File
Always convert from the largest resolution available. Converting the 480×360 file to PNG locks in a small image losslessly, which is rarely what anyone wants. Take the 1280×720 version when it exists — the 4K & HD page explains when it does not — and convert that one.