Watermark your photos, free and private.
Add a text or logo watermark to up to 50 images right in your browser. No uploads, no signup — your originals never leave your device.
Drop your photos here
PNG, JPG, or WEBP. Up to 50 photos per batch. Your photos never leave this device.
Add photos to enable the export.
Preview
Add photos to preview the watermark on your own images.
Everything runs locally in your browser. Photos are processed on this device and are never uploaded.
Frequently asked questions
Private by design. Free by default.
Local processing
Watermarking runs entirely in your browser. Your photos never leave your device and nothing is uploaded to a server.
No signup
No account, no email, no credit card. Open the page, add your watermark, and export — in seconds.
Originals stay safe
We create new watermarked copies and leave your original files untouched. Your originals stay exactly as they were.
Watermarking, built into every gallery.
This free tool is great for a quick batch. But if you deliver photos to clients, Glassline watermarks them for you out of the box — set your watermark up once and every gallery you publish carries it automatically. No exporting, no re-uploading, no per-batch fiddling.