Pixel bytes still match
The strongest result. The original file still matches the signature created when ProStamp captured the media.
Verification
Verify a ProStamp proof photo.
Check whether a capture still matches its signed evidence trail, from original files to recompressed copies.
Web verifier beta
JPEG and Evidence Pack verification runs server-side.
For an “original” result on iPhone
Upload the JPEG from an Evidence Pack, ZIP originals folder, AirDrop, or email attachment. The iOS photo picker in a browser can sometimes hand websites a system-reencoded copy, even when the photo looks unchanged.
- Best file
- Original JPEG from AirDrop, email attachment, ZIP archive, or Evidence Pack.
- Use caution
- Chat apps often recompress images, which can reduce verification to metadata-only. Videos and legacy photos still require the iOS app.
Capture details still match
The signed timestamp, location, and capture details are intact. The file is still useful evidence, but this uploaded copy is not the original image byte-for-byte.
Signature cannot be trusted
The file may have been changed outside ProStamp, stripped of verification metadata, or paired with the wrong code.
How it works
Verification follows the evidence, not just the screenshot.
Every ProStamp capture can carry signed information about when and where it was taken. Newer captures can also bind the original image bytes, which makes the original file meaningfully stronger than a screenshot or chat-compressed copy.
- Capture in ProStamp The app records the visual watermark, location context, and verification metadata at capture time.
- Keep the original Share by AirDrop, email attachment, ZIP archive, or Evidence Pack when evidence-grade verification matters.
- Verify before relying on it Use this page for signed ProStamp JPEGs, or the iOS app for videos, legacy captures, and deeper in-app review.
Evidence Pack
Use an Evidence Pack when the file needs to survive handoff.
An Evidence Pack is a shareable ProStamp export designed for clients, managers, and auditors. It keeps the original media together with readable reports and context, so reviewers do not have to guess which image, location, or timestamp belongs together.
Original files
Includes the ProStamp JPEGs or videos needed for the strongest verification path.
Reports
Adds PDF summaries that are easier to read, forward, archive, or attach to a work order.
Context
Keeps site, date range, address, GPS, and verification details organized in one export.
Best use
For disputes, client approvals, inspections, or team handoff, share an Evidence Pack instead of screenshots or chat-compressed photos.
What to send for the best result
- Original ProStamp JPEG
- Evidence Pack or ZIP originals folder
- Email attachment, not inline preview
- AirDrop transfer between Apple devices
What can weaken verification
- Messaging app compression
- Screenshot of a photo
- Edited or resized exports
- Missing metadata or wrong verification code