Currently there seems to be a 1MB file limit on image uploads for reverse image searching.
I assume because one of the reverse image providers has a 1MB limit?
if so: maybe just downscale the images for those providers and keep the original size for the others?
Either way: currently if you try to use an image above 1MB, nothing happens. the page result page is just blank without any error about it.
it was only when I tried to reverse image searching using this firefox addon that I noticed it's error message:
Test url: https://upload.wikimedia.org/wikipedia/commons/6/6a/PNG_Test.png
https://kagi.com/images?q=https%3A%2F%2Fupload.wikimedia.org%2Fwikipedia%2Fcommons%2F6%2F6a%2FPNG_Test.png&reverse=reference