100% In-Browser & Private

Watermark Image Online

Overlay text or logo branding onto your photos with customizable font size, color, opacity, 3x3 placement grid, and anti-theft diagonal tiling.

Watermark Settings

Customize overlay text or image logo branding

Live Canvas Engine

Watermark Type

Text WatermarkCustom Text

Overlay custom text with font size, color, opacity & tile repeat options.

Image / Logo WatermarkUpload Logo

Overlay a brand logo or signature graphic with scale & opacity controls.

Watermark Text

Font Size48px

Text Color

Watermark Opacity50%

Position Placement (3x3)

Anti-Theft Tiling Mode

Tile / Repeat Across ImageRepeats the watermark diagonally across the entire photo surface to prevent unauthorized cropping or theft.

Drop your images here, or browse

Supports JPG, PNG, and WebP images. Select multiple images for batch watermarking.

JPG / PNG / WebP• 100% In-Browser

100% Private In-Browser Conversion

Your files never touch any remote server or cloud storage.

Local RAM Processing

Conversion is calculated directly on your device CPU using standard HTML5 Canvas API.

Zero Cloud Uploads

No external APIs, databases, or third-party servers see your images at any time.

Works Completely Offline

Once loaded in your browser, you can disconnect Wi-Fi and convert files without internet access.

Text & Logo Watermarks

Switch easily between text overlays and uploaded PNG/JPG logos. Adjust font size, text colors, logo scale, and opacity with full flexibility.

Anti-Theft Tiling Mode

Protect high-value photography or document samples with diagonal repeating tiles across the entire image area to prevent cropping.

Zero Server Uploads

All compositing happens directly in your browser memory. Your images and watermark logos remain 100% private on your device.

Frequently Asked Questions

Everything you need to know about watermarking images online.

How does in-browser image watermarking work?

Our tool uses your browser HTML5 Canvas engine to composite text or image logos onto your photos locally. No images are uploaded to any external server, ensuring complete confidentiality.

What watermark types are supported?

You can choose between Text Watermark (custom text, font size, color, opacity, 3x3 position grid, and anti-theft diagonal tiling) or Image/Logo Watermark (upload a PNG, JPG, or WebP logo with custom scale and opacity).

What image formats are supported for watermarking?

You can upload and watermark JPG, PNG, and WebP images. Output files match your original file format and retain native image resolution.

Can I apply the same watermark to multiple images at once?

Yes! You can upload a batch of multiple photos at once. Applying your watermark settings will process all uploaded images simultaneously, and you can download all output files in a ZIP archive when 2 or more files are present.

Will watermarking reduce my original image quality?

No. The compositing engine renders your watermark directly onto a canvas matching your original full pixel resolution (e.g. 4K camera photos), saving output images with high fidelity.