Our watermarking tool supports all major image formats: **Input formats**: JPEG, PNG, WebP, GIF, BMP, and TIFF. **Output format**: The watermarked image will be saved in the same format as your original image, preserving all quality settings and metadata where possible. PNG format is recommended when you need to preserve transparency in the original image, while JPEG is perfect for photographs with watermarks.

Optimal watermark settings depend on your purpose: 1) **Copyright protection**: Use 15-30% opacity with corner positioning, 2) **Brand promotion**: Use 40-60% opacity with center or prominent positioning, 3) **Subtle marking**: Use 10-20% opacity with small font size, 4) **Anti-theft protection**: Use multiple watermarks or diagonal positioning with higher opacity. Consider your image content - dark watermarks work better on light images and vice versa. Our real-time preview helps you find the perfect balance.

Currently, our tool adds one text watermark per session. However, you can create multiple watermarks by: 1) **Layered approach**: Add first watermark, download, then upload the result to add another watermark, 2) **Strategic positioning**: Use longer text that spans multiple areas, 3) **Repeated text**: Include your watermark text multiple times in one entry. For advanced multi-watermark needs, consider using longer text strings or creating watermark patterns within a single text entry.

Anti-removal strategies include: 1) **Center positioning**: Harder to crop out without affecting main content, 2) **Diagonal rotation**: Makes automated removal more difficult, 3) **Multiple positions**: Layer watermarks if needed using our tool multiple times, 4) **Content integration**: Position over important parts of the image, 5) **Semi-transparent approach**: 20-40% opacity makes removal harder while keeping image usable. Avoid edges and corners if preventing removal is your primary concern, as these are easier to crop or clone out.

Absolutely not. All watermark processing happens entirely in your browser using HTML5 Canvas technology: 1) **Local processing**: Images are processed directly in browser memory, 2) **No server uploads**: Your files never leave your device at any point during the watermarking process, 3) **Instant deletion**: Processed images are removed from memory when you navigate away, 4) **Complete privacy**: No image data is ever transmitted to our servers, 5) **Offline capability**: Works without internet once the page loads. This ensures complete privacy and security for your valuable images.

Font size should be proportional to your image dimensions and purpose: 1) **Small images (under 800px)**: Use 12-24px font size, 2) **Medium images (800-2000px)**: Use 24-48px font size, 3) **Large images (over 2000px)**: Use 48-96px font size, 4) **Print images**: Use larger sizes (72px+) for visibility, 5) **Web images**: Smaller sizes (16-32px) for subtlety. Our tool provides real-time preview so you can see exactly how your watermark will look at different sizes. Consider the viewing distance and medium when choosing size.

Currently, our tool processes one image at a time to ensure optimal quality and customization for each image. This approach allows you to: 1) **Customize per image**: Adjust watermark settings for each image's unique characteristics, 2) **Quality control**: Review each watermarked result before downloading, 3) **Flexible settings**: Use different watermark text, positions, or styles as needed. For multiple images with identical settings, simply apply the same configuration to each image. We're considering batch processing for future updates based on user feedback.

Image quality is carefully preserved during watermarking: 1) **Lossless processing**: Our HTML5 Canvas implementation maintains original image quality, 2) **Format preservation**: Output format matches input format with same quality settings, 3) **Metadata retention**: EXIF data and color profiles are preserved where possible, 4) **No additional compression**: Unless you choose a different quality setting, no additional compression is applied, 5) **High-resolution support**: Handles large, high-resolution images without quality degradation. The only visual change is the intentional addition of your watermark text.