Batch Processing Workflow for Watermarking Multiple Images

Batch Processing Workflow

When you have tens, hundreds, or thousands of images to watermark, applying settings one-by-one is impractical. The batch processing feature lets you configure once and apply to many.

Step-by-Step Workflow

Step 1: Prepare Your Images

Organize source images in a single folder. Ensure they are in their final format and resolution:

/originals/
  ├─ photo-001.jpg
  ├─ photo-002.jpg
  ├─ photo-003.jpg
  └─ ... (up to hundreds of files)

Step 2: Configure Watermark Settings

Before loading the batch, configure your watermark on a single test image:

1. Load one representative image
2. Set placement mode (tiled recommended for batch)
3. Adjust text, opacity, font size, rotation, color
4. Verify the result looks correct
5. Test on 2-3 more images with different characteristics

Step 3: Load the Batch

Drag and drop your folder or select multiple files. The tool processes everything client-side using the Canvas API — no images are uploaded to any server.

Step 4: Processing

The tool applies your saved settings to each image sequentially:

• Canvas renders at the original image resolution
• Watermark parameters scale proportionally to image dimensions
• Progress indicator shows completion percentage

Step 5: Download

Download all watermarked images as a ZIP file or individually. Originals are never modified.

Performance Expectations

Processing speed depends on your device and image sizes:

Image Count	Average Size	Typical Time (modern laptop)
10 images	3000x2000	5-10 seconds
50 images	3000x2000	30-60 seconds
100 images	3000x2000	1-2 minutes
100 images	6000x4000	3-5 minutes

Tips for Large Batches

• Close other browser tabs to free memory for Canvas operations
• Process in groups of 50-100 if you have 500+ images to avoid browser memory limits
• Use a consistent export format (JPEG at 92% quality is a good default)
• Keep originals in a separate backup — never overwrite source files

Naming Convention

Watermarked files are exported with a suffix:

photo-001.jpg → photo-001-watermarked.jpg

This prevents accidental overwrites and makes it easy to identify which version is which.