What image formats does Add Watermark support?
You can upload JPG, PNG, WebP, and GIF images. The watermarked result is downloaded as a PNG or JPG depending on the original format.
Add Watermark to Image
Free online watermark tool — add text or logo watermarks to photos in seconds. No signup, no upload, runs in your browser. JPG, PNG, WebP, GIF.
100% free No signup required Your images stay private Works in your browser
Online Watermark Tool — Free & Private
Add a watermark to photos and images for free, directly in your browser — no account needed, no file upload required. NanoImage's online watermark tool lets you add text watermarks to protect your brand or add a watermark logo to mark product photos, portfolios, and creative work. It works on desktop, tablet, and mobile: you can add a watermark to photos on iPhone using Safari, or on Android using Chrome, with a fully touch-friendly canvas. Choose from text or image (logo) watermark modes, then adjust font, size, color, opacity, position, shadow, and outline. Each watermark is added as its own layer, so you can combine a text watermark with a logo on the same image. Bulk add watermark to photos free support is planned for a future release — the current version handles one photo at a time with full control over every detail.
How to Add a Watermark to Your Photo
- Click "Upload Image" or drag and drop a JPG, PNG, WebP, or GIF file onto the canvas.
- Select "Text Watermark" to type your label, or switch to "Image Watermark" to upload a logo file.
- Drag the watermark to your preferred position, then use the settings panel to adjust size, opacity, font, color, and effects such as shadow or outline.
- Click "Download Image" to save the finished photo to your device.
Frequently Asked Questions
How do I add a logo or image watermark?
Switch to the "Image Watermark" tab in the settings panel, then upload your logo or any image file. You can resize, reposition, and adjust its opacity just like a text watermark.
Can I freely position the watermark?
Yes. Drag the watermark anywhere on the canvas to place it exactly where you want. You can also use the preset buttons — Bottom Right, Bottom Left, Top Right, Top Left, or Center — for quick alignment.
How do I adjust watermark transparency?
Use the Opacity slider in the settings panel. Lower values make the watermark more subtle and semi-transparent, while higher values make it fully opaque. A setting around 30–50% is common for a natural look.
Are my images uploaded to a server?
No. All watermark processing runs entirely in your browser. Your image is never sent to any server, which means your files stay completely private on your device.
Does it support batch watermarking?
The current version processes one image at a time. If you regularly need to watermark many images at once, consider using NanoImage CLI, which supports batch operations from the command line.
Can I use Add Watermark on iPhone or mobile?
Yes. The tool works in mobile browsers including Safari on iPhone and Chrome on Android. The canvas is touch-friendly, so you can drag and resize the watermark with your fingers.
What text styles are supported?
You can change the font (including Pacifica, Inter, and Serif), size, color, and opacity. Bold, italic, and underline styles are also available in the text formatting toolbar.
Can I add shadow or outline effects to the watermark?
Yes. Expand the Effects panel to add a drop shadow (with adjustable blur, offset X, and offset Y) or an outline. These effects help the watermark stand out on light or dark backgrounds.
Can I add multiple watermarks to one image?
Yes. Each watermark you add appears as a separate layer in the Layers panel. You can select, move, or remove individual layers, making it easy to combine a text watermark with a logo watermark on the same image.