DateSealed
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Record your photo and stamp the date on it

Choose photos. Each original is recorded (only its hash is sent; nothing is uploaded), then a copy with a small DateSealed badge is made in your browser.

Please read

The record is for your ORIGINAL file. The stamped copy is a different file (its metadata is removed too), so keep the original: it is what shows that you had the photo first. The badge can be cropped out; it points to the record page and is not proof by itself.