Drop a CSV of SKUs and image links. Approve what you want. Export.
Step 1 · Your file
Drop your CSV hereor click to choose a file
Step 2 · Check the columns
Where to search
Google publishes no reverse-image-search API and blocks direct automation
with a CAPTCHA, so searching it goes through
SerpApi.
Free and unlimited. Matching on the picture works even when the
store numbers its products differently to you. The first run hashes every
image on the site (about a minute); after that it is instant. Untick to
match on your SKU column instead. Leave the field blank to skip.
Step 3 · Working
Step 4 · Results
Green matches are the same photo at higher resolution — ticked
for you. Amber ones are a different photo of the same SKU —
tick any you want to keep.