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图片水印工具
将图片拖到此处，或 点击上传
支持 JPG、PNG、GIF、WebP、BMP 格式，最大 50MB

Image Watermark Tool - Professional Online Watermark Maker

Free online image watermark tool designed for photographers, designers, and content creators. Add custom text or logo watermarks to protect your images with professional results. Support batch processing, transparent watermarks, and various positioning options - all processed locally for complete privacy.

✨ Key Features

  • Text & Image Watermarks - Custom text with font styling or upload logo/image watermarks
  • Batch Processing - Apply watermarks to multiple images simultaneously with same settings
  • Privacy Protection - All processing done locally in browser, no image uploads to servers
  • Format Support - Works with JPG, PNG, GIF, WebP, BMP formats up to 50MB each
  • Professional Quality - Maintains original image quality with lossless processing
  • Real-time Preview - WYSIWYG editor with instant preview of watermark effects

🚀 How to Use

  1. Upload Images - Drag and drop or click to select your images
  2. Choose Watermark Type - Select text watermark or image watermark mode
  3. Customize Settings - Adjust font, size, color, position, and transparency
  4. Preview Results - See real-time preview of your watermark effects
  5. Download Protected Images - Save watermarked images instantly

🎯 Perfect for

Photography

  • Copyright protection with photographer name and contact info
  • Portfolio watermarks maintaining professional appearance
  • Client preview images preventing unauthorized usage

E-commerce

  • Brand logo watermarks on product images
  • Batch processing for large product catalogs
  • Anti-theft protection for valuable product photography

Design & Creative

  • Designer attribution on creative work and drafts
  • "DRAFT" or "SAMPLE" watermarks for client previews
  • Copyright protection for digital artwork and designs

⚙️ Advanced Options

  • Position Control - 9 preset positions or custom coordinates
  • Transparency Settings - Adjust opacity from 10-100% for perfect balance
  • Rotation & Scaling - Rotate watermarks and scale image watermarks
  • Repeat Patterns - Create repeating watermarks for maximum protection
  • Font Customization - Multiple fonts with bold, italic, and size options

📱 Technical Details

  • Browser Compatibility - Chrome 60+, Firefox 55+, Safari 11+, Edge 79+
  • Mobile Support - Works perfectly on iOS and Android browsers
  • Processing - HTML5 Canvas rendering for high performance
  • Output Format - PNG format preserving transparency and quality
  • Offline Capable - PWA support allows offline functionality

💡 Pro Tips

Transparency Guide:
  • 80-100%: Strong copyright emphasis for sample displays
  • 60-80%: Balanced visibility for social media sharing
    40-60%: Subtle marking for professional portfolios
  • 20-40%: Invisible protection for final releases

Position Recommendations:
  • Bottom-right: Most common, doesn't interfere with subject
  • Center: Maximum protection for important documents
  • Repeat pattern: Full coverage preventing crop theft

❓ Frequently Asked Questions

Q: Is batch watermarking supported? A: Yes, upload multiple images and apply the same watermark settings to all.
Q: Does watermarking reduce image quality? A: No, we use lossless processing to maintain original image quality.
Q: Are my images uploaded to servers? A: No, all processing happens locally in your browser for complete privacy.
Q: What's the maximum image size? A: Single images up to 50MB are supported, with 10MB recommended for best performance.
Start protecting your images today with our free watermark tool - no registration required, unlimited use, complete privacy protection.