Mark your photos before they travel without you.
Add your name, handle or copyright line to one photo or a whole batch. Choose a discreet corner mark or a tiled pattern that's hard to crop out. Images are processed in your browser and saved at full resolution.
The dashed box is the largest crop that keeps most of the photo but removes your mark completely. For the current settings, it shows how much of the image someone could keep without it.
A visible mark is about credit and deterrence, not locks. Knowing its limits helps you choose how strong to make it.
A semi-transparent mark is a simple blend: published = (1 − α) × photo + α × ink. One image can’t separate the two. But average many photos carrying the identical mark and the photos blur into a smooth grey while the mark stays sharp, giving α for every pixel, which can then be divided back out. Below, your current mark is stamped on 32 generated photos and removed that way.
An invisible watermark hides an ID inside the pixels themselves. Two classic methods are compared on your current photo, with a 32-bit ID taken from your watermark text. Least-significant-bit (LSB) hiding rewrites the lowest bit of each pixel. Spread-spectrum adds a faint ± pattern across 8 × 8 blocks, so each bit is spread over many blocks. Each marked copy then goes through eight real edits, and the ID is read back without the original.
Visible marks live in the pixels; metadata lives beside them and disappears whenever a site or app strips it. Survival claims for the LSB and spread-spectrum rows are measured above; the rest are from general knowledge of the standards and vendor documentation.
the pixelsRe-saves, resizing, screenshots, reposts.Cropping (corner marks), inpainting, and estimation across a batch with identical placement (lab above).APP1 Exif · TIFF tags 0x013B, 0x8298Lossless copies and most desktop editors.Metadata stripping by many upload and messaging services; screenshots; ASCII only before Exif 3.0.APP1 XMP packet (ISO 16684-1)Same as EXIF, with full Unicode text.Same as EXIF.XMP (IPTC Core) or legacy APP13 IIMProfessional workflows; stock and news agencies.Same as EXIF.lowest bit of each pixelLossless PNG copies only.Any JPEG save, resize or brightness change (lab above).faint pattern spread across the pixelsJPEG, resizing, brightness (lab above).Crops and rotation without a sync pattern; anyone who knows the key.pixels, with sync patternsDesigned for crops, print-and-scan and recompression.Strong distortion; reading needs the vendor’s detector.signed manifest in JUMBF (JPEG APP11)Lossless copies; tampering is detectable.Stripping, unless paired with a soft-binding watermark.pixels, embedded by the generatorCommon edits, per vendor claims.Detector access is limited; robustness is vendor-reported.Neighbouring tools, with a typical result for each.