How many images can I process at once?

You can upload up to 50 images at a time. All processing happens in your browser using Canvas API, so the limit depends on your device's memory. For best performance, process 10-20 images per batch. Maximum image size is 20MB per file. Supported formats: JPG, PNG, and WebP.

Are my images uploaded to any server?

Absolutely not. This tool runs entirely in your browser. All watermark processing is done locally using HTML Canvas API. Your original images and watermarked results never leave your device. Perfect for confidential or sensitive content. No registration, no login, no server upload.

Does watermarking reduce image quality?

The output is saved as PNG (lossless format) to maintain original image quality. The watermark is composited at full resolution without downscaling. Watermark opacity is adjusted independently of the original image — your base image quality remains intact. For JPEG output, you can use browser's Save As option.

What watermark types are available?

Two types: Text watermark (customizable font size, color, opacity, rotation angle) and Image watermark (upload PNG/SVG/JPEG with adjustable size and opacity). Image watermarks work best with transparent PNG files containing logos or signatures. Choose between them based on your branding needs.

Can I customize the watermark position?

Yes, 9 preset positions are available: top-left, top-center, top-right, center-left, center, center-right, bottom-left, bottom-center, bottom-right. X/Y offset fine-tuning is supported for precise placement. Text watermarks also support rotation (-90 to +90 degrees), ideal for creating diagonal anti-theft watermark patterns.

Free Batch Watermark Tool - Online Image Watermark App

❓ FAQ

How many images can I watermark at once?

Up to 50 images per batch. All processing is done locally on your device using Canvas API. For optimal performance, we recommend processing 10-20 images at a time. Maximum file size is 20MB per image. Supported input formats: JPEG, PNG, WebP. Output is always PNG (lossless).

Is this tool really private?

Yes. This is a 100% client-side tool. Your images are processed entirely in your browser using Canvas API. Nothing is uploaded to any server. This makes it suitable for watermarking confidential images, private photos, or unreleased product shots. No registration or login needed.

What's the best format for image watermark?

PNG with transparent background is ideal for logo watermarks. Create your watermark in design software (Photoshop, GIMP, Canva) as a transparent PNG, then upload it here. Recommended watermark size: 200-500px. White or light-colored marks work best. The opacity slider helps you achieve the perfect balance between visibility and subtlety.

How are output files named?

Exported files are automatically named as 'originalname_watermarked.png'. You can download all processed images at once by clicking 'Download All' — they will download sequentially. Note: your browser may prompt you to allow multiple downloads. Enable pop-ups for this page if downloads are blocked.

Batch Watermark

📸 Upload Images

⚙️ Watermark Settings

📌 Position

❓ FAQ

How many images can I watermark at once?

Is this tool really private?

What's the best format for image watermark?

How are output files named?