Watermark Tool - Ixonae Utils

Watermark Tool

Add a watermark to your documents before sharing — everything stays in your browser

Upload

📄 Drop an image here or click to browse

Watermark Settings

Text

Font / Size

Color

Opacity

30%

Rotation (degrees)

-30°

Pattern

Horizontal Spacing

100

Vertical Spacing

80

Pros & Cons

Obvious deterrent — discourages casual sharing
Survives screenshots, format conversion, and printing
Works with any image format
Recipient knows the watermark is there
Can be cropped, painted over, or removed with editing tools
Degrades the visual quality of the document

Stealth Watermark (LSB)

Encodes a hidden message into the least significant bits of pixel data. Completely invisible to the eye.

Hidden Message

Embed In

Pros & Cons

Completely invisible — no visual change to the image
High data capacity — can embed long messages
Simple and fast to encode/decode
Destroyed by JPEG compression — PNG only
Destroyed by screenshots or re-saving
Destroyed by any image editing (resize, crop, filters)
Detectable by statistical analysis if someone looks for it

Stealth Watermark (DCT)

Embeds data in frequency-domain coefficients. Survives JPEG compression, resizing, and brightness adjustments.

Hidden Message

Strength

30

Higher = more robust but slightly more visible

Pros & Cons

Invisible — no perceptible change at reasonable strength
Survives JPEG compression (the key advantage over LSB)
Survives moderate brightness/contrast adjustments
Lower data capacity than LSB — best for short identifiers
Destroyed by screenshots
Destroyed by significant cropping or resizing
Slower to encode — processes every 8x8 block with DCT

EXIF Metadata

Embeds tracking data in image metadata fields. Easy to implement but can be stripped by metadata-removal tools.

UserComment

Artist

Copyright

Pros & Cons

Zero impact on image quality — metadata only
Standard fields — readable by any EXIF viewer
Trivial to implement and verify
Trivially stripped — most sharing platforms remove EXIF automatically
JPEG only — PNG does not support EXIF natively
Anyone can inspect and see the embedded data
Not sneaky at all — only useful as a first layer or deterrent

Decode / Extract

Upload a watermarked image to extract hidden data.

Extracted Data

Preview

Upload an image to get started