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FastToolAI

Image Watermark Tool

Add text or logo watermark online free

Use this image watermark tool to add watermark online to JPG, PNG, and WebP images. Add text watermark online free, place a logo watermark, and preview everything locally in your browser.

Text watermarkLogo watermarkCustom position and sizeLive previewBrowser local processing

Drag image here

or

Only 1 image is supported

Supports JPG / PNG / WebP formats

Your image is processed in your browser and will not be uploaded to the server.

100% local processing

All watermark work happens in your browser. Files are not uploaded.

Safe and private

Your images stay on this device, helping protect private photos and brand assets.

Free to use

Add text and logo watermarks without registration or hidden steps.

Multi-platform support

Works in modern browsers on Windows, Mac, iPhone, Android, and more.

How to add watermark to an image

1

Upload image

Choose a JPG, PNG, or WebP image.

2

Set watermark

Enter text or upload a logo, then adjust position, size, and opacity.

3

Preview result

Check the live preview and open the larger result preview.

4

Download image

Download the final watermarked image to your device.

Why choose FastToolAI Image Watermark Tool?

  • Add watermark online with a simple three-step workflow.
  • Supports both text watermark and logo watermark for different branding needs.
  • Browser-local Canvas processing keeps your images private.
  • Live preview makes position, size, and opacity easy to tune.
  • Works with JPG, PNG, and WebP images without installing software.

Common use cases for adding watermarks

  • Protect product and portfolio images from casual reuse.
  • Add brand logos to marketing images and social posts.
  • Add creator names or website addresses to shared photos.
  • Mark internal documents, screenshots, or design drafts.
  • Prepare ecommerce, blog, and social media images with consistent branding.

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Image to PDF

Create PDFs from images.

FAQ

Which image formats are supported?

This image watermark tool supports JPG, PNG, and WebP images.

Can I add text watermark online free?

Yes. You can add a custom text watermark, choose font, color, size, opacity, position, and rotation.

Can I add a logo watermark online?

Yes. Upload a JPG, PNG, or WebP logo and use it as an image watermark.

Can I adjust watermark opacity?

Yes. The opacity slider supports subtle or strong watermark effects from 0% to 100%.

Will adding a watermark reduce image quality?

The tool renders locally with high quality Canvas output. JPG export may apply normal compression.

Is my image uploaded to a server?

No. Reading, previewing, Canvas rendering, and download all happen locally in your browser.

Can I add watermarks to multiple images?

This version processes one image at a time to keep the workflow simple and predictable.

Can I edit after preview?

Yes. Close the preview or choose back to edit, then adjust the watermark settings without losing the uploaded image.