Frequently Asked Questions
Everything you need to know about our browser-based bulk image watermarker.
Is Watermarker.online free to use?
Yes, Watermarker.online is 100% free with no hidden fees, subscriptions, or watermarked output restrictions.
Do I need to create an account or sign up?
No account, password, or email registration is required. You can immediately open the studio, upload photos, and download your watermarked results.
Are my images uploaded to your servers?
No. All image decoding, watermark rendering, and batch compression happen directly in your web browser using HTML5 Canvas and Web Workers. Your images never leave your local device.
Can I watermark multiple images at once?
Yes! Watermarker.online is built specifically to watermark multiple images in bulk. You can select dozens or hundreds of photos at once and apply your watermark to the entire batch with one click.
Can I watermark 100+ images in a single batch?
Yes. Our background Web Worker pipeline queues tasks efficiently to prevent browser tab crashes and memory exhaustion, handling 10, 50, 100, or more images.
Can I add my own custom logo?
Yes. You can upload transparent PNG, WebP, or SVG logos. You can adjust the logo scale, opacity, rotation, and position, or combine your logo with text elements.
Can I adjust the watermark opacity?
Yes. An intuitive opacity slider allows you to choose any transparency level from 5% to 100%.
Can I rotate the watermark at arbitrary angles?
Yes. You can freely rotate your watermark from -180° to +180° using our fine slider, or use instant one-click angle presets (0°, 45°, 90°, -45°, -30°).
Can I create repeating or tiled diagonal watermarks?
Yes. We support full grid, diagonal, and horizontal tiled repeats with customizable gap spacing, stagger patterns, and angle control — identical to major stock photography protection patterns.
Can I download all processed images in a single ZIP archive?
Yes. The application uses client-side JSZip to bundle all watermarked output files directly in your browser without requiring server-side archiving.
Which image file formats are supported?
We support JPG, JPEG, PNG, and WebP for both input and export.
Can I save custom watermark templates locally?
Yes. Click "Save Custom" to store your watermark configuration in your browser’s localStorage. Your custom templates persist across page refreshes and can also be exported or imported as JSON.
Does it work on mobile phones and tablets?
Yes. The workspace is fully responsive. On mobile screens, the editor adapts with touch-friendly tabs and responsive viewports.
Does watermarking reduce the quality of my original images?
No. The original file objects remain untouched. For the output copies, you can customize the export format and quality slider (up to 100% maximum quality) or choose lossless PNG.
Ready to protect your photos?
No registration, no setup. Watermark multiple images immediately.
Watermark Multiple Images Now