Image & PDF Watermark Tool
Add visible watermarks to images and PDFs, or embed and decode blind watermarks and zero-width text fingerprints. Process supported files locally.
Carry this watermarked image directly into next workflow tools without re-uploading.
📁 1. Load Source File
Local ProcessingClick or drag file here
Supports PNG, JPG, WebP, SVG and PDF documents
sample.png
1200 × 800 px
2. Watermark Text & Parameters
1. Invisible Watermark Encoder
Click or drop source image here
Supports photos, artwork, and design graphics
💡 Blind Watermark Technology:
Blind watermarks embed invisible data into image pixels via spatial LSB encoding. The image appears identical to the human eye and can only be extracted via our decoder.
2. Blind Watermark Decoder
Upload image to verify watermark
System will scan and extract hidden copyright signatures
1. Embed Fingerprint in Text
2. Paste Text to Reveal Secret
4-Step Watermark & Copyright Guide
Select Mode
Choose Visible Tiling, Blind LSB Watermark, or Zero-Width Text Watermark.
Upload & Input Text
Drop your image, PDF, or document and enter your copyright disclaimer.
Adjust Angles & Opacity
Fine-tune rotation, font size, density and transparency in real-time.
Export & Decode
Download lossless PNG/PDF or extract hidden copyright with the decoder.
Watermark Tool FAQ
Q: What is a blind watermark and how does it differ from regular watermarks?
Regular watermarks are visible semi-transparent texts. Blind watermarks embed copyright data into pixel frequency/LSB bits without changing visual appearance, readable only via the decoder.
Q: Is it safe to watermark sensitive ID cards and documents here?
100% safe. All processing and PDF stamping run strictly inside your local browser memory. Zero files leave your computer.
Q: How does zero-width text watermarking work?
It uses Unicode zero-width characters (invisible characters) that carry binary data between words. When text is copied, the signature travels with it.
Q: What export formats are supported?
Lossless PNG images, multi-page PDFs, and direct text copy are fully supported.