How do I add a watermark to photos online?

Upload your photo, choose Text Watermark (with custom font, size, opacity, and rotation) or Logo Image Watermark, position it on the image, and download your protected photo.

Can I create a repeating tiled watermark across the entire photo?

Yes. Enable 'Tiled Watermark' mode to cover the whole image with diagonal repeating text to prevent unauthorized image theft.

Can I adjust watermark transparency and opacity?

Yes. Use the opacity slider (0% to 100%) to create subtle, professional copyright marks.

Can I batch watermark multiple photos at once?

Yes. Apply your watermark preset across multiple photos in a single batch session.

Does watermarking reduce original photo resolution?

No. Watermarks are composited on native high-resolution image bitmaps.

What image formats can I watermark?

Supports PNG, JPG, WebP, and AVIF photos.

Are photos uploaded to cloud servers?

No. All watermarking executes locally in HTML5 Canvas.

NexLove Media

Image Watermark Tool — Add Logo & Text Watermarks

TL;DR: Image Watermark Tool — Add Logo & Text Watermarks is a 100% free browser-based media utility. Protect your photos with customizable text or brand logo watermarks, 9-point anchor grid, rotation, and tiled patterns.

Drag & drop your image here

or click to browse from your device

Or press Ctrl + V to paste

JPG PNG WebP HEIC SVG Up to 50MB

100% local browser processing — this file never leaves your device

1. Watermark Content

Watermark Text

Font Family

Font Size (36px)

Text Color

Outline Stroke

Stroke Width: 2px

2. Placement & Styling

9-Point Anchor Grid

Full Security Tile Pattern (Anti-Theft)

Opacity: 60%

Rotation: 0°

Edge Margin: 30px

Blend Mode

Live Watermarked Preview

0 × 0 px

Export Format:

Download Watermarked Image

Understanding Image Watermark Tool — Add Logo & Text Watermarks

Watermark photos and graphics with custom copyright text, brand logos, or repeating anti-theft tile patterns. Adjust opacity, 9-point anchor grid, rotation, stroke outlines, and export in lossless PNG or JPG. Designed for creators, video editors, audio engineers, web designers, and developers who need instant, high-precision processing without software installation, watermarks, or file uploads.

Mathematical Formula & Technical Methodology

C_{\text{out}} = (1 - \alpha) C_{\text{image}} + \alpha \cdot \text{Blend}(C_{\text{watermark}}, C_{\text{image}})

Formula Variables Explained:
Alpha-composites text, logo bitmaps, or geometric tile matrices onto the base canvas buffer with blend mode support.

Step-by-Step Worked Example

Overlaying '@StudioNex' with 9-point bottom-right anchor at 45% opacity and 2px black outline produces clean, tamper-resistant attribution.

100% Client-Side Privacy Guarantee

All media decoding, manipulation, calculations, and encoding execute locally inside your web browser using HTML5 Canvas, Web Audio API, WebCodecs, Web Crypto, and modern JavaScript engines. Zero server uploads, zero telemetry, and no registration required.

Frequently Asked Questions

: Upload your photo, choose Text Watermark (with custom font, size, opacity, and rotation) or Logo Image Watermark, position it on the image, and download your protected photo.
: Yes. Enable 'Tiled Watermark' mode to cover the whole image with diagonal repeating text to prevent unauthorized image theft.
: Yes. Use the opacity slider (0% to 100%) to create subtle, professional copyright marks.
: Yes. Apply your watermark preset across multiple photos in a single batch session.
: No. Watermarks are composited on native high-resolution image bitmaps.
: Supports PNG, JPG, WebP, and AVIF photos.
: No. All watermarking executes locally in HTML5 Canvas.

Embed This Tool

Add the live Image Watermark Tool — Add Logo & Text Watermarks to your own website with this embed code:

<iframe src="https://nexlove.org/embed/image-watermark-tool.html" width="100%" height="650" style="border:1px solid #e2e8f0;border-radius:12px" title="Image Watermark Tool — Add Logo & Text Watermarks — NexLove" loading="lazy"></iframe>

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