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. Open the Pro panel, 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.