Add Watermark to Photos in Bulk — Free, Fast & Private
Watermarking is the simplest, oldest form of copyright assertion — and still works. Photographers add their @handle to a portfolio preview before posting it online. Designers brand a client mockup before sending it for review. Creators add a copyright string to product photos so screenshots can be traced back.
MiniPx applies a configurable text watermark to every photo in a batch. Nine anchor positions (corners, edges, centre), opacity slider, scale slider. The watermark is rendered onto the actual pixel data — not as a metadata field — so it survives screenshots, downloads, and re-uploads.
Watermark anatomy
- Position: 9 anchors — NW, N, NE, W, centre, E, SW, S, SE. Bottom-right is the photography convention; top-right works for designs.
- Opacity: 30-50% is the readable-but-not-distracting range. Pure 100% feels aggressive; under 20% gets cropped out.
- Scale: proportional to image size, so a 4K photo and a 800px photo get watermarks at the same visual weight.
- Text: @handle, copyright string, watermark slogan, anything — up to ~50 characters.
The right use cases
Photography portfolio previews — when the client hasn't paid yet. Public Instagram or X drops where you want attribution to stick. Stock-photo previews. Slide deck mockups for client review. Conference talk visuals to deter unattributed re-posting. Pre-release product reveals where you want a watermark on the leaked screenshot trail.
What watermarks don't do
A determined attacker can remove a watermark with content-aware fill or AI inpainting (PhotoGrid, EzRemove, Photoshop's Generative Fill). For real protection, watermarking is a deterrent + provenance signal, not a lock. The right mental model: a watermark says "this image is mine and someone tampered with it" — visible if removed, undeniable if intact.
The full bulk workflow
Drop your batch into the MiniPx compressor on the homepage. Open the Pro panel there, toggle Watermark, type your text, pick position + opacity + scale. Optionally also generate a responsive set — every variant gets the watermark too. Save the whole preset as "watermarked portfolio export" for one-click re-use on every future shoot. See the main watermark tool page for the technical details.