You can watermark photos in two main ways: visible and invisible.

A visible watermark is the common kind placed on the image to show your name, logo, or copyright notice. A simple way to make one is in an editor like Photoshop or GIMP: create a new layer, add text or a logo, position it where you want, and adjust opacity so it doesn’t overpower the photo. Many programs can also apply this automatically during export; Lightroom is one example.

If you need to add the same watermark to lots of files, you can:

• use export-time watermarking in your photo software,
• use an image host that applies watermarks on upload,
• or record an action/macro in an editor and batch-apply it.

An invisible watermark is different: it’s meant for tracking and copyright identification rather than branding. These are added with dedicated tools or plugins such as Digimarc and are designed to survive some edits better than visible marks.

Visible watermarks may discourage casual theft, but they won’t fully prevent copying. Invisible watermarking can help with tracking, while visible marks are best for branding and attribution.