How does batch watermarking work? βΎ
Upload your logo once, set your position and size, then add all the images you want to stamp. Click "Apply Watermark" β the tool draws your logo onto every image in the queue directly in your browser. Download each one individually, or grab them all as a single ZIP file.
Does PNG transparency work? βΎ
Yes. When you choose PNG as the output format, the alpha channel is preserved throughout β your logo transparency is composited correctly and the output retains any original transparency. For JPG output, a white background fill is applied (JPEG does not support transparency).
How many images can I process at once? βΎ
Up to 50 images per batch. If you have more, simply process in two batches. Each image is processed sequentially so the browser stays responsive even on low-end devices.
Are my images uploaded to a server? βΎ
No β never. All processing uses the browser's Canvas API and runs entirely on your machine. Your images and your logo never leave your device. This works fully offline once the page has loaded.
Can I watermark just one image here? βΎ
Yes, but for single images with a live drag-to-position preview, try the
single image watermark tool instead β it has more controls including tiled mode, rotation, and QR code watermarks.