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JPG, PNG, WebP, HEIC — add as many as you like; the same watermark goes on all of them
Files are processed locally — they never leave your browser.
Image Watermark puts your name, brand or logo on photos before you share them. Type a text watermark or upload a logo (a PNG with a transparent background works best), then choose one of nine positions or repeat it diagonally across the whole image so it can't be cropped away. Size is set relative to each photo, so a batch of different-sized pictures all get the same look. Opacity, rotation, colour, bold and shadow are adjustable with a live preview. Download one image, or all of them in a ZIP at full resolution, in their original format. Everything happens in your browser; no photo is uploaded.
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