Watermark Tool

Add text or image watermarks to images with customizable position, opacity, and style. Batch processing up to 10 files with 9 placement options.

Drag & drop images or click to browse

Up to 10 images · PNG, JPG, WebP, AVIF, TIFF · max 10MB each · same watermark applied to all

APIPOST /api/v1/images/watermark
5(18 votes)
2
checks performed
Try also: Image Resizer
Run Check

Key Features

100% Free

No registration required, unlimited checks

Instant Results

Real-time analysis with detailed output

REST API Access

Integrate into your workflow via API

Accurate Data

Live queries to authoritative sources

What is Watermark Tool?

The watermark tool adds text or image watermarks to your photos with complete control over positioning, opacity, size, rotation, and style. Choose from 9 placement positions (center, corners, edges) and fine-tune transparency from fully visible to nearly invisible for subtle branding. Text watermarks support custom fonts, colors, and sizes.

Image watermarks accept PNG logos with transparency for professional results. Batch processing handles up to 10 files simultaneously, applying the same watermark settings to all images — perfect for photographers watermarking an entire shoot. This free online watermark tool is used by photographers protecting their portfolio images from unauthorized use, businesses adding brand logos to product photos and marketing materials, content creators marking their work before sharing on social media, real estate agents watermarking property photos, and anyone who needs to establish visual ownership of their images.

All processing happens in your browser — images are never uploaded to a server.

How to Use

  1. 1Upload one or more images (supports batch processing up to 10 files at once)
  2. 2Choose watermark type: text (custom text, font, color, size) or image (upload a logo — PNG with transparency recommended)
  3. 3Select placement position from 9 options: center, top-left, top-right, bottom-left, bottom-right, and edges
  4. 4Adjust opacity (30-50% is typical for visible-but-unobtrusive protection)
  5. 5Preview the watermark on your images and adjust settings as needed
  6. 6Download all watermarked images

Who Uses This

System Administrators

Monitor and troubleshoot infrastructure

Developers

Debug network issues and integrate via API

SEO Specialists

Verify domain configuration and performance

Security Analysts

Audit and assess network security

Frequently Asked Questions

How do I add a watermark to multiple photos at once?
Upload up to 10 images using the file selector or drag-and-drop. Configure your watermark settings (text or image, position, opacity, size) once, and the tool applies the same watermark to all images simultaneously. Download the results individually or all at once. This batch processing feature is ideal for photographers who need to watermark an entire photo shoot or businesses preparing a set of product images for their catalog.
What is the best watermark opacity for protecting photos?
For most use cases, 30-50% opacity strikes the best balance — the watermark is clearly visible to discourage theft but doesn't overpower the image content. For portfolio display, 20-30% is sufficient. For maximum protection (images shared in contexts where theft is common), 50-70% makes removal much harder. Light watermarks on dark image areas and dark watermarks on light areas are more effective — consider placing your watermark across the center or a detailed area of the image to make removal without visible damage very difficult.
Can I use my company logo as a watermark?
Yes — select the image watermark option and upload your logo file. PNG format with a transparent background works best, as it allows the image to show through behind the logo. You can control the size (relative to the image), position (9 placement options), and opacity of the logo overlay. For a professional look, use a white or light-colored logo at 30-40% opacity — this works well on most photo backgrounds.
Does watermarking reduce image quality?
The watermark overlay itself doesn't reduce the underlying image quality — it adds a layer on top. However, the final saved image undergoes re-encoding, which for JPEG format means slight compression artifacts. For maximum quality, use PNG output format. The original image dimensions and resolution are preserved. The watermark is permanently embedded in the output file — it cannot be separated from the image data without visible damage, which is the point of watermarking.
Are my images safe when using this watermark tool?
Yes — all watermark processing happens entirely in your browser. Your images are never uploaded to any server, never stored, and never accessible to anyone else. The tool uses client-side JavaScript and the HTML5 Canvas API. This is especially important for photographers and businesses who handle client photos or unreleased product images that must remain confidential.

Related Articles

Explore Popular Image Formats: A Comprehensive GuideWiki

Explore Popular Image Formats: A Comprehensive Guide

Explore popular image formats like JPEG, PNG, and GIF, and learn how to choose the best one for your needs. Discover practical optimization tips.

NetVizor Team
Mar 2, 2026

Related Tools

Image Resizer

Image Cropper

Image Compressor

Image Format Converter

Popular Tools

DNS Lookup

WHOIS Lookup

Domain Age

Nameserver Checker

API Endpoint

POST /api/v1/images/watermark
View Documentation