Create and Apply a Watermark in Photoshop Using a Custom Brush
You’ll design a watermark from editable text and a thin line, then save it as a custom brush so you can stamp it onto any image. This approach is fast, flexible, and easy to position, scale, and style on separate layers.

Step-by-step instructions
Create the watermark document
File → New: 1920 × 1080 px, Background Contents: White.
Type Tool (T): set font to Whisper (script) in Black; click and type your name; commit.
Type Tool (T): click again to add your website on a second text layer; set font to Helvetica (Light), All Caps; increase Tracking (200+ by typing a value).
Move Tool (V): rotate your name slightly by dragging near a corner.
Add a separator line and link layers
Line Tool (U): set Stroke color Black, Weight ~3 px; draw a thin line between name and URL.
In Layers, Shift‑click to select the text and line layers; right‑click → Link Layers.
Save the watermark as a brush preset
Rectangular Marquee Tool (M): drag a tight selection around the watermark.
Edit → Define Brush Preset; name it (e.g., YourName Watermark) → OK.
Stamp the watermark on a photo
File → Open your image; Layer → New → Layer to create an empty layer for the watermark.
Brush Tool (B): select your new watermark brush; set Foreground color to White (or preferred).
Resize with [ and ] keys; click to stamp the watermark where you want it.
Adjust and reuse
Lower the watermark layer Opacity for subtlety; try Blend Modes like Soft Light.
Move Tool (V) to reposition; Edit → Free Transform (Ctrl+T) to scale if needed.
Repeat on other images; the white background you used when creating the brush is ignored, and darker brush content stamps more solidly.