Using Preloadr is absolutely free and does not require any registration. You will be redirected to log into your account at Flickr.com and then sent back to this platform where you can access all your images and upload new photos. Before sending the images to Flickr, you can modify them with several tools like cropping, sharpening, color correction and much more. Once you've optimized your photo you can specify details about the image and set tags, as you're used to do at Flickr. If you're a Flickr Pro user, you can edit an existing image and replace the current copy with the new version.