Add Watermark

Apply text or image watermarks to your photos in batches. Fully customizable position, opacity, scale, and rotation. Free, private, and works in your browser.

A watermark tool adds text or image overlays to your images to protect copyright, brand content, or add logos. You can customize position, opacity, font size, color, and rotation. This tool processes images entirely in your browser using the HTML5 Canvas API -- your images are never uploaded to any server, making it safe for confidential or unreleased visual assets.

Watermark your images without uploading them

Text or logo watermarks, batch processing, tiled patterns, and full customization — all processed locally in your browser. No uploads, no sign-up, no limits.

100% private

Batch processing

Free unlimited

How to use

1
Upload Your Image(s)
Click the upload area to select one or more images you wish to watermark.
2
Configure Your Watermark
Choose between a 'Text' or 'Image' watermark. Customize its content, color, position, opacity, scale, and rotation.
3
Apply to All Images
Click the 'Apply' button. The tool will process all your uploaded images with the same settings.
4
Download
Once processing is complete, you can download all the watermarked images together in a single .zip file.

Full Control Over Your Watermarks

Text or Logo

Use custom text as a copyright notice or upload your own logo for consistent branding.

Full Customization

Adjust opacity, scale, rotation, and placement. Choose from nine positions or tile it across the entire image.

Batch Processing

Apply the same watermark to hundreds of photos at once and download them in a single ZIP file.

100% Private

Your images are processed locally. They are never sent to our servers, giving you complete privacy and instant results.

Understanding Image Watermarking

Why watermark your images?

Watermarking is the practice of adding a visible mark -- typically a logo, brand name, or copyright notice -- to an image to establish ownership and deter unauthorized use. In the age of social media, images can be copied and redistributed in seconds, often without attribution. A watermark makes it clear who owns the image and makes unauthorized use less appealing, as the watermark must be removed (which degrades image quality) before the image can be passed off as original.

Watermarks are used by photographers (to protect portfolio images), e-commerce businesses (to prevent competitors from copying product photos), content creators (to brand social media graphics), and stock photo agencies (to preview images before purchase). The key is finding the right balance: the watermark should be visible enough to deter theft but not so obtrusive that it ruins the viewing experience. A common technique is placing a semi-transparent watermark in the center or bottom-right corner with 30-50% opacity.

Beyond visible watermarks, invisible (digital) watermarks embed information in the image's pixel data that can be detected by specialized software but not seen by humans. These are used by services like Digimarc to track image usage across the web. However, visible watermarks remain the most practical solution for most creators -- they're simple, effective, and don't require any special software to verify.

Technical considerations for watermarking

Image watermarking is performed using the Canvas API's drawImage() and fillText() methods. The image is first drawn to a canvas, then the watermark text or logo is composited on top using globalAlpha for transparency. The canvas is then exported as a new image using toBlob() or toDataURL(). The output format can be JPEG (smaller, lossy) or PNG (larger, lossless). For photographs, JPEG at 90% quality provides a good balance of file size and visual quality.

When watermarking multiple images (batch processing), the browser processes them sequentially to avoid memory issues. Each image is loaded, watermarked, exported, and then the canvas memory is released before processing the next one. For large batches (100+ images), this can take several minutes but won't crash the browser. The processing happens in the browser's main thread, so the UI may be slightly unresponsive during batch operations -- web workers could be used for background processing, but Canvas API support in workers is limited.

Why Watermark Your Images?

Copyright Protection:

A visible watermark deters unauthorized use and makes it clear that the image is your intellectual property.

Brand Promotion:

Your logo or website URL on an image acts as free marketing when your photos are shared online.

Proofing for Clients:

A tiled watermark is the perfect way to protect proof images sent to clients before final payment.

Tracking Image Usage:

A unique watermark can help you track where your images are being used online without your permission.

How does this compare to other watermark tools?

A side-by-side comparison of popular image watermarking tools.

Feature	NovaTools	Watermarkly	PicMarkr
Privacy (no upload)	100% browser	Uploads to server	Uploads to server
Text watermarks	Customizable
Image/logo watermarks
Batch processing		(paid only)	(paid only)
Custom position & opacity			Limited
Free unlimited use		Freemium	Freemium

Server-based watermark tools require uploading your images -- a privacy concern for unreleased products, client work, or personal photos. Our tool composites watermarks entirely in your browser using the Canvas API.

FAQ

Are my images uploaded to your servers?

No. Your privacy is our priority. All processing, from adding the watermark to generating the final file, happens entirely within your web browser using the HTML5 Canvas API. Your images are loaded into the browser's memory, composited with your watermark settings, and exported as new image files — all on your device. The images are never transmitted over the network, stored on a server, or accessible to anyone but you. When you close the browser tab, all image data is cleared from memory. This makes the tool safe to use for confidential client work, unreleased product photos, or sensitive medical and legal documents.

Can I use my own logo as a watermark?

Yes. Select the 'Image' watermark type and upload your logo file. We recommend a PNG with a transparent background for the best results, as it allows the underlying image to show through the non-logo areas. The tool supports PNG, JPG, WebP, and BMP logo formats. Once uploaded, you can adjust the logo's position (9 preset positions or custom coordinates), size (as a percentage of the base image), opacity (0-100%), and rotation angle. This gives you the same level of control as a dedicated photo editing application, without the cost or learning curve.

What is a 'tiled' watermark?

A tiled watermark repeats your text or logo across the entire image in a grid pattern. This is a highly secure way to protect your images from unauthorized use, as the watermark cannot be easily cropped out or removed without destroying the image content. Tiling is commonly used by stock photo agencies, professional photographers, and proofing services to prevent image theft before purchase. The tool lets you control the tile spacing, opacity, and rotation of each tile, so you can balance protection with visual aesthetics.

Can I watermark multiple images at once?

Yes. The tool supports batch processing — upload as many images as you want, configure your watermark settings once, and click 'Apply'. The tool will process all images with the same settings and package them in a single ZIP file for download. This is ideal for photographers who need to watermark an entire photoshoot, e-commerce stores that need to brand their product catalog, or content creators who want to protect a batch of social media images. The batch processing happens entirely in your browser, so there are no upload limits or server processing delays.

What image formats are supported for the output?

The tool exports watermarked images in PNG or JPEG format, depending on the original image type and your preference. PNG is recommended for images with transparency or when you need lossless quality. JPEG is recommended for photographs where file size matters more than pixel-perfect quality. The tool preserves the original image's resolution and aspect ratio — it only adds the watermark layer on top. If you need WebP or other formats, you can use our Image Converter tool after watermarking.

Will the watermark reduce image quality?

No. The watermark is composited onto the original image using the Canvas API's high-quality rendering pipeline. The original image data is not re-compressed or re-sampled — the watermark layer is simply drawn on top and the result is exported as a new file. If the original image is a JPEG, the output will also be JPEG at the same quality level. If the original is PNG, the output will be PNG with lossless compression. The only quality consideration is the watermark image itself — if your logo is low-resolution, it may appear pixelated when scaled up.

Can I adjust the watermark position precisely?

Yes. The tool offers 9 preset positions (top-left, top-center, top-right, center-left, center, center-right, bottom-left, bottom-center, bottom-right) as well as a tiled mode. For each position, you can fine-tune the exact placement using X/Y offset controls. You can also adjust the watermark's scale (as a percentage of the base image width), opacity (0-100%), and rotation angle (0-360 degrees). This level of control ensures the watermark is visible without obscuring important image content.

Is there a file size or batch limit?

There is no artificial limit imposed by the tool. The practical limit depends on your device's available memory (RAM) and processing power. Most modern computers can handle batches of 50-100 high-resolution images without issues. If you are processing very large images (e.g., 50+ megapixels) or very large batches (100+ images), the browser may become temporarily unresponsive during processing. In that case, try processing in smaller batches. The tool shows a progress indicator so you know how many images have been processed.

Your Privacy is Our Priority

This tool is fully browser-based, meaning your images are never uploaded to a server.

All processing happens locally on your machine using the HTML5 Canvas API, giving you complete control and 100% privacy.
The tool reads your image files directly from your computer's memory, composites the watermark layer on top, and exports the result as a new image file — all without any network requests.
There are no server-side logs capturing your image filenames or watermark text, no analytics tracking your usage patterns, and no persistent storage of any kind.
When you close the browser tab, all image data and watermark configurations are cleared from memory immediately.

This makes the tool safe to use for confidential client work, unreleased product photos, medical imaging, legal evidence, and any scenario where image data should not be exposed to third-party servers.

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