How to detect duplicated wallpapers?

Hi everyone, i am new here and i want to upload some wallpapers that i have been collecting since long time ago (SFW and NSFW).

I want to upload some of them but i dont know if there are already uploaded before, is there any way to verify first?

I have already uploaded 2 images (NSFW) that I manually verified had not been previously uploaded and to check if the page has a tool to detect duplicates. (admins please let me know if i upload them correctly and i followed the rules marked in Wallhaven)

Thanks in advance!

Not sure if this is what you already mean by manually, but I use whvn's image search:

1. Click the camera icon in the search bar
2. Upload the images you want to check for already uploaded copies
3. Click search
4. It shows similar looking images