Add Watermark

It depends on the purpose. For copyright protection where you want the watermark clearly visible, 40–60% opacity works well. For subtle branding that doesn’t distract from the image, 15–30% is more appropriate. The tiled option at low opacity (10–20%) is the hardest to remove while staying visually clean.

Use a PNG with a transparent background for best results. A white or black logo on a transparent PNG blends naturally with any image. SVG files also work well. Avoid JPG for watermark logos as it doesn’t support transparency and will show a rectangular box around your logo.

No — the watermark is composited onto the image using the Canvas API at high quality. The download uses 93% JPG quality (or lossless PNG if your original was PNG), so the base image quality is preserved. Only the watermark layer is added on top.

A tiled (repeated) watermark across the entire image is much harder to remove than a single watermark in one corner. With a corner watermark, someone can simply crop the image. With a tiled pattern, removing it would require significant editing work that destroys the underlying image. Tiled watermarks at 10–20% opacity provide strong protection while remaining unobtrusive.

The output format matches your original image. JPG images download as JPG, PNG images download as PNG (preserving transparency). The watermark is permanently embedded in the image data — it cannot be removed without re-editing the file in image editing software.