Image hosting sites - free image upload without registration

What are the best free image web hosting services, where it is possible to upload images without account registration ?

There are many image hosting services available with or without registration. They allow to upload images for free without registration, but if you create an account, you can often use advanced features, create albums or upload large files.

Image hosting sites appear to be a simple services, but you can find mulitple differences between them, like maximum file size limits, maximum or minimum dimensions limit, direct image links available, number of images uploaded per period, multiple files upload, image compression etc.

Image hosting sites without registration required:

• ImgBB.com - simple and easy to use, supporting many image formats, direct image links available, 34 MB size limit
• Imgur.com - easy to use, supporting many image formats, 20 MB size limit for non-animated images and 200 MB size limit for animated images, anonymously uploaded larger images will be lossily compressed
• Imgbox.com - simple and easy to use, 10 MB size limit
• Imgshare.io - simple and easy to use, supporting many image formats, direct image links available, 6 MB size limit for anonymous upload
• Postimages.org - simple and easy to use, direct image links available, 24 MB size limit
• Pasteboard.co - simple and easy to use, 10 MB size limit
• Imgpile - simple and easy to use, direct image links available, 100 MB size limit
• im.ge - simple and easy to use, 50 MB size limit