Drop image here or click to upload
PNG, JPG, WebP, GIF supported
#ffffff
Upload an image to preview
Watermark will be rendered here// overlay custom text on images in one click
Add custom text watermarks to images with adjustable opacity, position, font size, and color. Free browser-based tool, no upload required.
Drop image here or click to upload
PNG, JPG, WebP, GIF supported
Upload an image to preview
Watermark will be rendered hereDrag & drop or click to select a PNG, JPG, WebP, or GIF file.
Set your text, choose position (or tiled mode), adjust size, opacity, and color.
Click "Apply Watermark" to preview, then "Download PNG" to save.
The Image Watermark Tool lets you overlay custom text on any image directly in the browser. Everything is processed client-side using the HTML5 Canvas API — your images never leave your device. Adjust opacity, pick a position from a 9-point grid, change font size and color, or use tiled mode to scatter the watermark across the entire image.
No. All processing happens entirely in your browser using the HTML5 Canvas API. Your images are never sent to any server. This makes the tool safe for confidential documents and private photos.
You can upload PNG, JPG/JPEG, WebP, and GIF images. The output is always downloaded as a PNG file for maximum quality and transparency support.
Tiled mode repeats the watermark text across the entire image in a diagonal grid pattern. You can adjust the tile spacing and rotation angle to achieve different coverage densities.
Yes. Use the Opacity slider to set the watermark transparency from 5% to 100%. Lower values create subtle, semi-transparent watermarks. White text at 30–50% opacity is a popular choice.
There's no enforced limit — the tool runs in your browser, so limits depend on your device's memory. Very large images (above 20 MB or 8000+ pixels) may slow down rendering on lower-end devices.
Currently the tool supports a single line of watermark text. For multi-line watermarks, add line breaks using a tool like Notepad and paste the result — the canvas renderer will handle the layout.
Protecting your digital images has never been easier. Whether you're a photographer safeguarding your portfolio, a content creator branding your social media visuals, or a business adding confidentiality labels to documents, watermarking is one of the most effective deterrents against unauthorized use. The JLV Image Watermark Tool gives you a full suite of watermarking controls — directly in your browser, with no sign-up, no file upload, and no cost.
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Traditional watermarking software required downloading applications, uploading files to cloud services, or waiting for server-side processing. This tool takes a different approach: it uses the HTML5 Canvas API built into every modern browser to render watermarks locally on your device. When you upload an image, it's drawn onto a hidden canvas element. The watermark text is then overlaid using canvas drawing commands with the settings you specify, and the result is exported as a PNG data URL that you can download immediately.
Because everything runs client-side, your original images are never transmitted over the internet. This is particularly important for sensitive materials like legal documents, unreleased product photos, or personal photographs.
The tool offers two distinct placement modes:
Beyond just position and mode, the tool gives you fine-grained control over the visual appearance of your watermark:
A watermark is only as effective as its placement. Here are some recommendations:
Because this tool processes everything in your browser, there are no server logs, no retained copies of your images, and no accounts needed. Once you close or refresh the tab, the image data is gone. This client-side approach also means the tool works offline once the page has loaded — useful if you're working in a low-connectivity environment.
The tool accepts PNG, JPG/JPEG, WebP, and GIF files as input. The output is always saved as a PNG, which preserves the highest quality and supports transparency. If you need a different output format, you can use our Image Converter to convert the PNG to JPG, WebP, or another format after watermarking.
Photographers use watermarks to protect portfolio work shared on social media or client galleries. Designers watermark mockups and UI previews shared before project completion. Businesses add "CONFIDENTIAL" or "DRAFT" overlays to sensitive documents exported as images. Artists watermark prints and digital art before sharing online. Content creators brand thumbnails and promotional images with their logo or channel name.
Whatever your use case, this tool is designed to give you professional results in seconds — no software installation, no account, and no cost.