Image Watermark Tool - Add Text and Logo Watermarks to Photos with Batch Processing

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Add text or logo watermarks to your images entirely in your browser. Supports custom fonts, stroke outlines, shadow and emboss effects, 9-point positioning, tile/repeat patterns with configurable angle, and batch processing with ZIP download. Your images never leave your device — all processing happens locally using the Canvas API.

All processing is performed entirely in your browser using client-side JavaScript and the HTML5 Canvas API. No images are transmitted to any server. Your photos and images never leave your device.

  • This tool is provided "AS IS" without any warranties of any kind.
  • The author accepts no responsibility for any data loss or quality degradation.
  • Canvas-based processing may produce slight rendering variations compared to native image editors.
  • Always keep backups of your original images before processing.
  • By using this tool, you accept full responsibility for any outcomes.

This tool uses client-side JavaScript for all processing. No data is transmitted to servers, no files are uploaded online, all processing happens locally in your browser. Once loaded, this tool continues to work even without an internet connection. For more details, please refer to our Web Tools Disclaimer.

Drop images here, click to browse, or paste from clipboard
JPEG, PNG, WebP — up to 50 MB per file, 20 files max

Features

  • 100% Client-Side Processing: Your images are never uploaded to any server. All watermarking happens entirely in your browser using the HTML5 Canvas API. Your photos never leave your device.
  • Text Watermark with Stroke Outline: Add text watermarks with independent fill and stroke colors, each with their own opacity control. The stroke outline ensures readability on any background — a feature most online watermark tools lack.
  • Logo / Image Watermark: Upload your own logo or brand image as a watermark. PNG files with transparency are fully supported for professional results.
  • 9-Point Position Grid + Tile/Repeat: Place watermarks at any of 9 positions (corners, edges, center) or enable tile mode for a repeating pattern with configurable angle, spacing, and brick-pattern stagger.
  • Shadow & Emboss Effects: Add drop shadows with customizable blur, offset, and color. The emboss effect creates a raised 3D appearance for a professional, subtle watermark.
  • Multi-line Text & Font Control: Enter multi-line watermarks, choose from 8 web-safe fonts, adjust size, bold/italic style, and line spacing for pixel-perfect results.
  • Interactive Before/After Preview: Drag the comparison slider to see the original and watermarked image side by side in real time, helping you fine-tune opacity and placement.
  • Batch Processing with ZIP Download: Process up to 20 images at once with the same watermark settings. Download all watermarked images as a single ZIP file.

How to Use

  1. Upload Images: Click the drop zone, drag and drop files, or paste from clipboard. Supports JPEG, PNG, and WebP up to 50 MB each (20 files max).
  2. Choose Watermark Type: Select the "Text Watermark" tab for text-based watermarks or "Logo / Image" tab to use your own logo file.
  3. Customize Settings: Adjust text content, font, size, colors, opacity, stroke outline, effects (shadow/emboss), position, rotation, and tile/repeat options. The live preview updates in real time.
  4. Apply Watermark: Click "Apply Watermark" on individual images or "Watermark All" for batch processing. Use the before/after slider to compare results.
  5. Choose Output Format: Select PNG (lossless) or JPEG (smaller file size) with quality control.
  6. Download: Download individual watermarked images or use "Download All (ZIP)" for batch downloads.

Important Notes

  • Font rendering may vary slightly across operating systems and browsers, as this tool uses web-safe system fonts.
  • For logo watermarks, PNG files with transparent backgrounds produce the best results.
  • Very large images (e.g., 4K+) with tile mode enabled may take a moment to process due to the number of watermark instances rendered.
  • The watermark is permanently embedded into the output image. It cannot be removed from the downloaded file.
  • Always verify the watermark placement and opacity on the preview before processing your final images.

Common Use Cases

  • Protecting photography portfolios: Photographers and designers can add a semi-transparent text or logo watermark across their work before sharing on social media, client galleries, or stock photo platforms. This discourages unauthorized use while still showcasing the image.
  • Branding marketing materials: Add your company logo to product photos, promotional banners, or event images in bulk. The batch processing feature lets you watermark up to 20 images at once, ensuring consistent branding across an entire campaign.
  • Marking confidential documents: Apply a "CONFIDENTIAL", "DRAFT", or "INTERNAL USE ONLY" text watermark to screenshots, diagrams, or scanned documents before sharing them in business communications. Tile mode ensures the watermark covers the entire image.
  • Creating proof images for clients: Freelance designers and agencies can deliver watermarked preview images to clients before final payment. The adjustable opacity and positioning options let you create a visible but non-intrusive proof overlay.
  • Adding copyright notices to artwork: Digital artists can embed their name, website, or copyright symbol directly into their work. The stroke outline and shadow effects help ensure the watermark remains visible regardless of the background content.
  • Processing sensitive images privately: Since all watermarking happens locally in your browser, this tool is safe for images containing personal information, proprietary designs, or any content you do not want to upload to a third-party server.

About Digital Watermarking

Digital watermarking is the practice of embedding identifying information into digital media such as images, videos, or audio files. In the context of images, a visible watermark is a graphic or text overlay that indicates ownership, copyright, or usage restrictions without completely obscuring the underlying content.

Visible watermarks have been used in various forms for centuries. Physical watermarks in paper date back to 13th-century Italy, where papermakers embedded designs into sheets during manufacturing to identify their origin. In the digital era, visible watermarks serve a similar purpose — they establish provenance and discourage unauthorized reproduction.

  • Text watermarks: The most common type, consisting of a name, URL, date, or copyright notice rendered directly onto the image. Text watermarks are lightweight, customizable, and effective for establishing attribution.
  • Logo watermarks: A company or personal logo placed on the image. Logo watermarks are more visually distinctive than text and are widely used in professional photography, e-commerce, and media production.
  • Tile watermarks: A repeating pattern of text or logos that covers the entire image surface. Tile watermarks are difficult to crop out and provide the strongest protection against unauthorized use, making them common for stock photo previews.
  • Opacity and blending: Effective watermarks balance visibility with unobtrusiveness. Lower opacity (10–30%) creates a subtle mark that does not distract from the content, while higher opacity (50–80%) is used when deterrence is the primary goal.

This tool applies visible watermarks using the HTML Canvas API, rendering text or logos directly onto image pixel data. The watermark becomes a permanent part of the output image and cannot be separated from the original content after processing.

Frequently Asked Questions

  • What image formats are supported? This tool accepts JPEG, PNG, WebP, BMP, and GIF files as input. Output images are saved in PNG format to preserve watermark transparency and quality. For JPEG output, the PNG can be converted using any image editor.
  • Can I watermark multiple images at once? Yes. The batch processing feature supports up to 20 images simultaneously. All images receive the same watermark with identical settings. When processing multiple images, they are packaged into a ZIP file for convenient download.
  • Will the watermark reduce image quality? The watermark is composited onto the image using the Canvas API at full resolution. There is no additional compression or quality loss beyond the watermark overlay itself. Output images maintain the same dimensions and resolution as the input.
  • Can I remove a watermark after applying it? No. The watermark is permanently rendered into the output image pixels. Always keep your original unwatermarked files. This tool does not modify your source files — it creates new watermarked copies.
  • How do I position the watermark precisely? Use the 9-point positioning grid to place the watermark at any corner, edge center, or the center of the image. Fine-tune the position with X and Y offset controls. The live preview shows exactly where the watermark will appear before you process the image.
  • What is tile mode? Tile mode repeats the watermark across the entire image in a grid pattern. You can adjust the spacing between repetitions. This mode is commonly used for stock photo previews and provides the most comprehensive coverage against cropping.
  • Is my data safe? Yes. All image processing happens entirely in your browser using JavaScript and the Canvas API. No image data is uploaded to any server. You can verify this by monitoring your browser's network activity during processing.

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References:
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Written by Hidekazu Konishi