Interesting name for an interesting place. ImgTaxi.com is a porn hosting that will act like a taxi for your adult content. If you don't understand what this means, then you should go listen to Justin Bieber. You deserve each other.
The homepage will give you a taxi theme and the uploading form is right there. You can access a HTML5 upload or a remote upload. As a guest, you can only upload one image at once. If you want to do more, register and login. You can drag your images or you can browse your hard drive for it. By default it is set on adult, but if you have soft, non-nude photos, you can safely check the Clean box. They accept JPG, JPEG, PNG and GIFs. Once again I will tell you the difference between guest and registered user. As a guest, the file size is limited to 1MB. If you will sign up for an account, the size will reach 5MB. Also, you will be able to upload up to 50 files at once.
Push on More Options if you want to resize your photo into small thumbs, medium thumbs or original size. They can do that!