About this tool
A watermark is a semi-transparent text or logo stamp overlaid on an image to mark ownership, discourage unauthorized reuse, or brand a preview before a final file is delivered. This tool composites a watermark onto any image entirely in your browser: drop a photo, choose either a custom text stamp (with font size, color, opacity and rotation) or a second image (like a logo, scaled to a percentage of the photo's width and its own opacity), pick one of nine anchor positions with a margin from the edge, and download the result as PNG or JPEG. The live preview updates as you adjust any control, and the final export is always rendered at the original image's full resolution — nothing is uploaded, everything happens on the Canvas API right on your device.
Text watermarks are measured and centered precisely at the chosen anchor point before rotation is applied, so a diagonal "SAMPLE" or "© Your Name" stamp lands exactly where you'd expect regardless of angle. Image watermarks preserve their own transparency (a logo with a transparent background stays transparent) as long as you export to PNG — JPEG export fills transparent areas with white, which is only a concern if your watermark itself has soft or see-through edges. Lower opacity values (around 0.2–0.4) keep a watermark unobtrusive over photos, while higher values make it a bold, hard-to-remove stamp; combining a large margin with a corner position is the most common choice for a subtle, professional look.
Frequently asked questions
Can I watermark multiple images at once?
Not currently — this tool processes one image at a time so you can precisely position the watermark on each. For a large batch, you'd need to repeat the process per image; if your settings (text, position, opacity) stay the same each time, that's usually quick since the controls remember their last values while the tab stays open.
Does the watermark stay editable after downloading?
No — the downloaded file is a flat, merged image with the watermark permanently baked into the pixels, exactly like printing on paper. This is intentional: a watermark that could be trivially removed by anyone who downloads the file wouldn't serve much purpose. Keep your original, unwatermarked image if you might need it again later.