Add Watermark to Image

A watermark marks a photo as yours before you post it, send proofs to a client or list products online. This tool stamps your name, website or logo onto a whole batch of images in one go — in a corner, in the centre or tiled diagonally across the picture — at the size and transparency you choose. The photos are processed in your browser and never uploaded.

How to use this tool

1. Choose the photos to protect.
2. Pick a text watermark and type it, or pick “Logo image” and choose your logo (a PNG with a transparent background looks cleanest).
3. Set the size as a percentage of each photo’s width, and the opacity — 30–50% is visible without spoiling the picture.
4. Choose one of nine positions and the edge margin, or “Tiled” with an angle and spacing for maximum protection.
5. Download the watermarked photos one by one or as a ZIP.

Formula

Mark width (logo) = logo % × photo width; text height = text % × photo width; margin = margin % × shorter side

Sizes are relative, so a batch of different-sized photos gets marks that look the same on each. The mark is placed by its anchor inside the margins (left = margin + (W − 2·margin − mark width) × a, with a = 0, 0.5 or 1) and blended with the chosen opacity. Tiled mode repeats the mark on a rotated grid with every other row shifted by half a step, covering the photo edge to edge.

Example

For a 3000 × 2000 px photo, a 20% logo is 600 px wide; with a 3% margin it sits 60 px from the bottom-right corner. A 5% text mark “© Your Name 2026” is 150 px tall; at 40% opacity it remains readable on light and dark areas thanks to the thin outline.