Pexels is a website that offers a huge amount of shared stock images, updated weekly with powerful filtering features, you can filter images by search popularity, or by color, etc. A wide variety of resolutions can be downloaded, including the original image size.
Free image sites also have many problems, such as slow loading images, slow updates, etc. Sometimes you also encounter cases where people with ulterior motives steal paid images to post on free sites.
So, in addition to the six free HD copyright-free image sites above, we've also screened 3 authoritative paid sites to support photography rights if you're really not bad off.
After all, every image is the photographer's heart and soul.