● Signed
Every signed image can verify itself.
Trust your images wherever they go. Sign once. Verify anytime.
Built for the AI era, where image authenticity matters more than ever.
▶ Watch 2-Minute DemoDetect whether a signed image has been modified without requiring the original image.
Image integrity workflow
Original image not requiredVerification travels with the signed image.
✓ Verified
Self-verifying
Every signed image contains what is needed to verify itself.
No original required
Verify the signed image without locating a separate master copy.
Ready to travel
Verification still works after sharing, emailing, or downloading.
Modification detection
Check whether image pixels have changed since signing.
How it works
A clear chain of image integrity.
PixelSeal keeps the workflow simple: sign an image, share it normally, and verify it whenever integrity matters.
Sign
PixelSeal embeds a cryptographic signature and optional custom signing note directly into the image—without adding a visible watermark.
Share
Send, download, archive, or distribute the signed image.
Verify
Check whether the image has been modified—without the original.
Product demo
See PixelSeal in action.
Watch this 2-minute introduction to see how PixelSeal signs and verifies an image without requiring the original.
Valid signed imageSignature and pixels match
✓ VerifiedModified signed imageA pixel-level change was detected
! Modified
Modification detection
PixelSeal detects content changes.
From a single changed pixel to cropping, resizing, image adjustments, or added content, PixelSeal verifies whether signed image content has remained unchanged.
Even very small changes
- One or more pixels
- Dots, lines, text
Image modifications
- Crop, resize, rotate, flip
- Brightness, contrast, color
- Blur, sharpen
Added content
- Logos, watermarks, overlays
- Timestamps, signature blocks
Use cases
Designed for real workflows
Example workflows where it is important to verify that images have not been modified.
Photography
Seal exhibition-quality images for archival and provenance workflows.
Construction
Detect modifications in site photos, inspections, progress records, and project documentation.
Insurance
Detect modifications in images used for claims, investigations, and dispute resolution.
Legal
Detect modifications in images used for evidence, intellectual property, and legal documentation workflows.
Journalism
Help preserve the integrity of published photographs and visual reporting.
Healthcare
Protect the integrity of clinical images and medical documentation.
Digital evidence
Verify that evidentiary images have remained unchanged since signing.
Research archives
Help preserve the integrity of research data, laboratory images, and scientific archives.
Industry insights
What we learned from industry conversations
We have spoken with professionals across several industries to better understand where image integrity, authenticity, and change detection create real workflow challenges.
Architecture & Infrastructure
“Engineering teams spend a significant amount of time reviewing contractor submissions against approved drawings. Finding changes is often the most time-consuming part of the review.”
Architect, European railway infrastructure
Branding & Printing
“After artwork is approved, even small unintended changes before printing can be difficult to notice.”
Branding professional
Digital Archives
“Authenticity becomes challenging when historical blueprints must be scanned in multiple sections and digitally reconstructed.”
Archive specialist, Germany
Photography
“Professional photographers often work in RAW but publish JPEG, which introduces different authenticity challenges.”
Professional photographer
These conversations continue to shape the evolution of PixelSeal. We are actively interviewing professionals across industries to better understand where image authenticity and trust matter most.
Why this matters now
AI changes what we can assume about images.
AI-generated and AI-edited content makes it increasingly difficult to know whether an image has remained unchanged. PixelSeal provides a precise answer to a narrower, important question: has this signed image been modified since it was signed?
Image integrity, without claims about the truth of the content itself.
For developers
Bring image integrity into your workflow.
PixelSeal is available through a REST API for signing and verifying images within existing products and processes. Applications can embed their own signing note with each image, allowing the signed file to carry information about the workflow or organization that signed it—without adding anything visible to the image.
PixelSeal REST API
SIGN an image SHARE the signed image VERIFY without the original
FAQ
Questions, answered.
Does verification require the original image?
No. Every signed image contains what PixelSeal needs to verify it, so the original image is not required for comparison.
What happens if metadata is removed?
PixelSeal embeds integrity information directly into the image itself and does not depend on metadata. Removing or changing metadata does not affect PixelSeal verification.
Can a signed image be emailed or downloaded?
Yes. A signed image can be shared, emailed, downloaded, or archived and later verified, provided the image pixels have not been changed.
What image formats are supported?
PixelSeal signs lossless PNG, WebP, BMP, and TIFF images. JPG and HEIC uploads are accepted and converted to PNG before signing because lossy formats can change pixel values when saved again.
Does PixelSeal detect any image modification?
PixelSeal detects pixel-level changes to a signed image. A modification causes verification to return a modified result.
Is PixelSeal the same as C2PA?
No. C2PA focuses on provenance and content history. PixelSeal focuses on whether a signed image has changed. The approaches can be complementary.
Does PixelSeal determine whether an image is truthful?
No. PixelSeal does not judge what an image depicts or how it was created. It verifies whether the signed image has been modified since signing.
Contact
Interested in learning more about PixelSeal or exploring a potential use case?
Whether you're evaluating image integrity for your organization, researching authenticity workflows, or simply curious about the technology, we'd love to hear from you.
📧 contact@stemilabs.com