ExifToolexiftool.org
The reference command-line tool for reading, writing and stripping metadata (EXIF, IPTC, XMP, GPS, maker notes) in images, video, audio and documents. Supports hundreds of formats.
imagevideofile / docdetails
tools / fotoforensics
FotoForensics
Online image forensics. Error Level Analysis (ELA), metadata, JPEG quality estimation and hidden-pixel checks, with a good set of tutorials on interpreting the results.
freeweb
field note
Uploads are retained and may be public. Don't submit sensitive or unpublished images. Also, ELA is easy to misread; work through the site's tutorial before you call something "edited".
used in playbooks
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domainfile / docdetails