PNG Sample Files
PNG files are raster files, similar to JPGs, but also contain an alpha layer. An alpha layer allows for transparency, so it is possible to make PNG files with transparent backgrounds, or translucent areas. PNGs are popular on the web due to their great compression and the alpha layer.
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What is a PNG file?
PNG is a lossless raster format with full alpha transparency. Because it does not discard any detail and supports a transparent background, it is the standard choice for logos, icons, screenshots, and any graphic that needs sharp edges or must sit cleanly over other content.
How these sample PNG files were made
Most images are generated with PHP's GD library as a diagonal gradient with a labelled border, in sizes from 100x100 up to 4K. The set also includes a transparent sample, a chequerboard with a circular alpha cut-out so you can see the transparency clearly, a single 1x1 pixel image, and a 32x32 favicon.
Technical details
PNG uses lossless DEFLATE compression and an 8-bit alpha channel. Quality never degrades on re-saving, which makes it a safe working format, although photographs compress more efficiently as JPG or WebP.
Common uses
Use these files to test transparency handling, favicon and icon rendering, tracking-pixel behaviour with the 1x1 image, lossless asset pipelines, or responsive images across a wide size range.