Specifically for finding the source of an image, I like to use Search by Image if you want an extension, or ImgOps if you want a website. Source: about 1 year ago

Imgops lets you upload the image once and search it through many sites. I found yandex to work very well. Source: about 1 year ago

Https://imgops.com/ looks like its currently down, but it usually supports these reverse image searches:. Source: about 1 year ago

There's no one best solution. You can find most of the better ones here: https://imgops.com/. Source: about 1 year ago

Take a screenshot of one of the channels’ videos and feed it to a meta reverse image search site like https://imgops.com/. Source: about 1 year ago

Fotoforensics image analysis tool [Here is a tutorial on usage] [Do not forget to read submission guidelines]. Source: 11 months ago

There's also a site called FotoForensics... There are great tutorials linked to there at the bottom of the page if you really want to dig deep and learn additional ways to determine whether a photo is authentic or altered some way: https://fotoforensics.com/. Source: about 1 year ago

Tineye and Foto Forensics. Do you want to know if an image is shopped, cropped or otherwise altered? Using these two tools you've got a good chance of finding out. Tineye is reverse image search on steroids and foto forensics provides free image analysis tools. Www.gutenberg.org. Source: about 1 year ago

FotoForensics: Another web-based tool that provides a range of analysis techniques, including metadata extraction, for photos. (https://fotoforensics.com/). Source: about 1 year ago

Found it. The technique is called Error Level Analysis, and the earliest purveyor was Foto Forensics, which still provides limited free access. There are other such tools now, some built into programs like Photoshop itself. Source: about 1 year ago