Image Watermark Tool

Introduction

Image watermark tool quickly adds text watermarks to images, supporting single positioning and tiled repeat modes. Can customize text content, color, size, opacity, rotation angle, and output format. All processing completed locally in browser without uploading images, protecting privacy.

Core Features

• Local Processing: All watermark addition completed in browser, images not uploaded
• Dual Modes: Supports single watermark positioning and tiled repeat watermark
• Full Customization: Text, color, size, opacity, rotation angle
• Format Selection: Output PNG (lossless) or JPEG (compressed) format
• Real-time Preview: Instantly shows effects when adjusting parameters

How to Use

Step 1: Upload Image

1. Click upload area to select image file
2. Supported formats: PNG, JPEG, JPG, WebP, and other common image formats
3. Image displays in preview area after upload

Step 2: Set Watermark Style

Basic Settings

• Repeat: When enabled, watermark tiles to cover entire image; when disabled, single watermark
• Text: Enter watermark content (like copyright info, attribution, URL, etc.)
• Color: Click color block to select text color
• Size: Adjust text font size (12-120px)
• Opacity: Control watermark visibility (0-1, 0 is fully transparent, 1 is fully opaque)

Single Watermark Mode (Repeat Disabled)

• Left: Watermark distance from left edge as percentage (0-100%)
• Top: Watermark distance from top edge as percentage (0-100%)

Tiled Watermark Mode (Repeat Enabled)

• Space: Spacing between tiled watermarks (8-200px)
• Rotate: Watermark rotation angle (0-90 degrees)

Output Settings

• Format: Choose PNG or JPEG format
• JPEG Quality (JPEG format only): Adjust compression quality (50%-100%), higher value means clearer

Step 3: Preview Effect

View watermark effect in real-time in right preview area:

• Preview updates immediately when adjusting parameters
• Can confirm watermark meets needs through comparison

Step 4: Download and Save

1. After confirming satisfactory effect, click "Download" button
2. File automatically downloads locally, filename is watermark.png or watermark.jpg

Use Cases

Copyright Protection

Add copyright watermarks to photography works and design drafts. Add usage notes to ID photos and ID card scans to prevent misuse. Add brand logos or store information to product images.

Social Media

Create share images with personal/brand logos. Add watermarks to Weibo, Xiaohongshu, Instagram images. Create social media content with unified style.

Samples and Display

Add "Sample" or "Demo" watermarks to design samples. Create product display images with price or contact information. Add source identification to tutorial screenshots.

Documents and Proof

Add usage notes to scanned contracts and agreements. Add anti-counterfeiting watermarks to document copies. Add confidential or limited distribution identification to internal documents.

Watermark Mode Comparison

Single Watermark Mode

Advantages:

• Precise position control
• Does not block image main content
• Suitable for attribution and copyright statements

Disadvantages:

• Easy to remove by cropping
• Limited coverage area

Use cases:

• Photography work attribution
• Add URLs or QR codes to image corners
• ID photo usage notes

Tiled Watermark Mode

Advantages:

• Covers entire image, difficult to remove
• Better theft prevention effect
• Adjustable density and angle

Disadvantages:

• May affect image appearance
• Need to adjust opacity to balance protection and aesthetics

Use cases:

• High-value image theft protection
• Sample images and design draft display
• Copyright content requiring strong protection

Usage Tips

Opacity Settings

• High Opacity (0.3-0.5): Watermark faint, doesn't affect appearance, suitable for display purposes
• Medium Opacity (0.5-0.7): Watermark clearly visible but not overly prominent, recommended default value
• Low Opacity (0.7-1.0): Watermark very obvious, strong protection but may affect aesthetics

Color Selection

• Light Images: Use dark text (black, dark gray)
• Dark Images: Use light text (white, light gray)
• Colorful Images: Use contrasting colors or semi-transparent white/black

Tiled Watermark Optimization

• Appropriately Increase Spacing (40-80px): Avoid overly dense affecting appearance
• Rotation Angle (15-30 degrees): Diagonal watermarks more natural, not easily automatically removed
• Adjust Opacity (0.2-0.4): Protects while not excessively blocking

Output Formats

• PNG: Uses lossless compression, supports transparency
• JPEG: Uses lossy compression, adjustable quality (50%-100%)

Privacy Protection

• All image processing completed locally in browser, not uploaded to server
• Watermarked images only saved on your device
• Tool does not collect, store, or analyze your image content

Comparison with Similar Tools

Compared to online watermark services, this tool processes completely locally without uploading images, protects privacy and has no file size or usage limits. Versus desktop software (like Photoshop), operation simpler and faster, no installation needed. Versus mobile apps, cross-platform and supports batch processing workflows (combined with scripts).