800x450 is 2.4 times smaller then regular HD quality (1920x1080), you can use https://imageresizer.com/ to resize your image. Source: 12 months ago

The bot's avatar image you're attaching might be too large. If that is the case use a service like https://imageresizer.com to shrink it to a reasonable size. Under 1MB is safe. Source: about 1 year ago

Windows PTs only has a simple resize tool. What you want is https://imageresizer.com/ that is mentioned in the sticky guide that has a crop function as well. I hope this helps :). Source: about 1 year ago

FastStone Image Viewer is great, and you can easily make handy presets. There are tons of other tools out there. Look at https://imageresizer.com Set the width first (like 3440), then crop. Source: about 1 year ago

Do the following to every image 1. Resize images to at most two times display size - https://imageresizer.com/ 2. Compress using LOSSY https://compressor.io Note: using LOSSY compression reduces storage size of image significantly but loses a minor amount of quality. If you were displaying artwork and that was main focus of the site maybe do lossless but most of the time LOSSY is fine. 3. Convert to webp... Source: about 1 year ago

There are sights like visualwatermark.com or makewatermark.com or if you want to do it on your phone you can just google free watermark apps... Or you could google how to watermark your photos for free :). Source: over 2 years ago