Safely add watermarks to your photos with this free browser-based batch image watermarking tool. Process images locally with zero server uploads for privacy.
AI Generation Prompt
Batch Photo Watermark Adder (Local Processing)
Overview
This application is a privacy-first, client-side web utility designed to allow users to apply text or image-based watermarks to large batches of photographs without uploading files to a server. All image manipulation is performed locally using the HTML5 Canvas API.
Core Features
- Drag-and-Drop Uploader: Support for bulk uploading images via drag-and-drop or file system picker.
- Real-time Preview: Interactive preview mode to visualize how the watermark will look on individual images.
- Flexible Watermarking:
- Text Watermark: Customizable font, font size, color, opacity, rotation, and alignment.
- Logo Watermark: Support for PNG/SVG logo uploads with scaling and tiling options.
- Processing Engine: Uses Web Workers to prevent UI freezing during heavy image processing tasks.
- Batch Export: One-click download of all processed images as a single, compressed ZIP file.
- Preservation Options: Toggles to maintain or strip EXIF metadata.
Layout Structure
- Header: Simple, clean navigation with instructions toggle.
- Main Dashboard (Two-Column Layout):
- Left Sidebar (Configuration Panel): Contains settings for watermarking, including tabs for 'Text', 'Image', 'Position', and 'Output Settings'.
- Right Canvas (Workspace): Displays the list of queued images with status indicators (Pending, Processing, Done). Includes a focused preview window for selected images.
- Footer: Status bar indicating memory usage and processing progress.
UI/UX Design
- Visual Style: Minimalist aesthetic. High contrast, using a palette of Slate Grey, Cool White, and Indigo for primary actions.
- Animations: Subtle transition effects when files are added to the list. Smooth progress bars for the batch processing state.
- Feedback: Clear success/error state icons for individual file processing.
Technical Implementation
- Frontend: HTML5, CSS3 (using Flexbox/Grid for responsiveness), and JavaScript (ES6+).
- Performance:
- OffscreenCanvas API for non-blocking rendering.
- JSZip library for creating downloadable archives in-browser.
- Accessibility: Fully keyboard-navigable interface and screen-reader compliant input labels.
- Browser Compatibility: Works on all modern Chromium and WebKit-based browsers.
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Frequently Asked Questions
Everything you need to know about using this application.
Is my data uploaded to a server?
No. This tool uses client-side browser technologies. Your photos never leave your device, ensuring maximum privacy.
Can I process multiple images at once?
Yes. The batch processing feature allows you to upload and apply watermarks to hundreds of images simultaneously.
Does this tool work without an internet connection?
Once the page has loaded, you can disconnect from the internet and continue using the tool, as all processing is local.
What file formats are supported?
You can import standard formats like JPEG, PNG, and WebP, and export the processed files as a ZIP archive.
