Check whether an image or a book file (PDF or EPUB) came from the Alexandria Archive, and whether it is still as we kept it or was changed afterwards. The file never leaves your device.
The check accepts images and book or document files (PDF and EPUB) alike.
If the image came from the Alexandria Archive it carries a marker we recorded the day we kept it. Choose it on this page and we compare: if it matches, it is exactly as we kept it and has not been edited. If we do not recognise it that does not mean it is fake — only that it is not ours.
Yes. The archive keeps a fingerprint of the original file of every book or document it holds — a whole PDF or EPUB — exactly as it does for images. Choose the file on the verification page and we will tell you whether it is the copy we kept. Note that re-saving, compressing, or merging pages in a reader produces a different file, even when the pages inside still read the same.
No. Your browser works out a short marker that stands for the image and sends only that. The picture itself never leaves your device, and we keep nothing.
We confirm the image is the same one that reached the archive and has not been edited since that day. We do not confirm who took it or when, unless its record says so — and every statement names outright what it does not claim.
Most likely it is a copy that was re-saved or compressed. Any re-save changes the file even when the picture looks identical. Try the copy you downloaded from the archive itself.
Yes, and that is the point. Every statement is signed, and anyone can check that signature with the public key published on this site, and work out a file's marker themselves with any standard tool. None of it requires taking our word for anything.