png

Nine PNG files plus an animated folder. The plain files run from 160x120 up to 4000x3000, with the biggest only about 30 KB because the flat colour compresses so well. One file, png_transparent_800x600, has an alpha channel, so you can see whether your resizer or thumbnailer keeps the see-through areas or fills them with black. The animated folder holds a 5 second looping APNG (34 KB), an animated PNG that some tools show as a still frame. Use these to test upload limits, preview rendering, and the transparency and animation handling of image libraries.