💧 Image Watermark
Add a text watermark to your image in seconds — pick the position, size, color, and opacity, then download a clean PNG. Everything runs in your browser; no file is ever uploaded.
About
This tool stamps a text watermark onto your image entirely inside the browser using the Canvas API — your original file never leaves your device. You can place the watermark at any of the four corners, centered, or tiled across the full image. Font size is expressed as a percentage of the image width, so the result scales correctly regardless of image resolution. Color and opacity controls let you create both subtle copyright notices and bold visible stamps. The canvas preview updates in real time as you adjust settings, and the final output is downloaded as a lossless PNG.
How to use
- Drop your image onto the upload area or click to select a file from your device.
- Type your watermark text — a copyright line, brand name, or any label you need.
- Choose the position: top-left, top-right, center, bottom-left, bottom-right, or tiled.
- Adjust the font size (% of image width), color, and opacity until the canvas preview looks right.
- Click Download PNG to save the watermarked image to your device.
FAQ
- Is my image uploaded to a server?
- No. The watermark is applied entirely in your browser using the Canvas API. Your image never leaves your device.
- What does the tiled position do?
- Tiled repeats the watermark text across the entire image in a diagonal grid pattern, making it much harder to crop out.
- What does font size percentage mean?
- Font size is calculated as a percentage of the image's pixel width, so a 5% size on a 2000 px image renders as a 100 px font — consistent across all resolutions.
- Can I use a transparent or semi-transparent watermark?
- Yes. The opacity slider ranges from 0 (invisible) to 100 (fully opaque). Values around 30–50 % produce a subtle watermark that doesn't obscure the image.
- What image formats can I use as input?
- Any format your browser can display — JPEG, PNG, WebP, GIF, BMP, SVG, and AVIF. The output is always a PNG to preserve the watermark at full quality.