Verify that an image has not been modified.
SteMiSign embeds cryptographic integrity directly into image pixels — so any modification becomes detectable, while the image remains visually unchanged.
How SteMiSign Works
Step 1: Sign an image
SteMiSign embeds a cryptographic signature into the image.
Step 2: Verify a signed image
Verification checks whether the image still contains a valid SteMiSign signature and whether it has been modified.
After signing, you can click "Verify This Signed Image" to check the newly signed image immediately.
If the image is edited, cropped, recompressed, or otherwise altered, verification should fail.
Step 1: Sign an Image
Embed a cryptographic signature into PNG, WebP, BMP, TIFF, or JPEG images.
HEIC/HEIF uploads are converted to PNG automatically.
Step 2: Verify the Signed Image
Upload a signed image, or click "Verify This Signed Image" after signing.
Verification confirms whether the image still contains a valid SteMiSign signature.
Waiting for verification…