What is a PNG?
Definition
PNG, short for Portable Network Graphics, is an image file format that uses lossless compression, so saving it does not discard picture detail. It supports transparency through an alpha channel, which makes it popular for logos, graphics and cutouts.
Why it matters for sellers
PNG keeps edges and flat colors sharp, so text, logos and icons look clean in it. It is a good master format for a product cutout, because you can place the same file on many backdrops without losing the transparent edge.
The tradeoff is size. A photograph saved as PNG is often much larger than the same photo saved as JPG, which can slow a product page or exceed a marketplace upload limit. Many sellers keep a PNG master and upload JPG copies of finished listing images.
How to do it with Instasize
Instasize can resize a PNG while keeping its transparency, and convert PNG files to other formats. These core tools are free.
- Open the PNG Resizer or the Image Converter.
- Upload your PNG file.
- Set the new size or choose the output format.
- Download the result and check that transparency or quality is as expected.
Related Instasize pages
Examples
Shop logo
A seller saves the logo as a PNG so the edges stay sharp and the background stays transparent on every banner.
Product cutout master
A cutout of a lamp is stored as a PNG, then placed on white, grey and a scene for different channels.
Listing photo upload
A full photo saved as PNG is too heavy for the upload, so the seller converts the final image to JPG.
Frequently asked questions
What is the difference between PNG and JPG?
PNG is lossless and supports transparency. JPG is lossy, has no transparency and usually makes smaller files for photos.
Is PNG better quality than JPG?
PNG preserves every pixel, so it is better for graphics and masters. For a finished photo, a high quality JPG often looks the same at a smaller size.
Does converting PNG to JPG lose transparency?
Yes. JPG cannot store transparency, so transparent areas get filled with a solid color.