Diagonal Text Watermark

Diagonal Text Watermark stamps your text across an image on a diagonal, either as one centered label or repeated across the whole frame in a tiled pattern. It's for the moment you want a visible "this is a draft / this is mine" mark on a preview image before you share or deliver it - the classic preview-watermark use case. It's honest about being a visible mark: no subtle steganography here, just your text, angled, covering ground.

The inputs that matter

• image (IMAGE) - the source.
• text (STRING, default "WATERMARK") - what gets stamped.
• font_size (INT, 10–500, default 48).
• opacity (FLOAT, 0–1, default 0.3) - the watermark's alpha. 0.3 is a sane preview watermark; crank toward 1.0 for something that screams.
• angle (FLOAT, default -45) - rotation in degrees.
• color - one of white, black, red, blue, green. That's the whole palette; no custom hex.
• repeat (BOOLEAN, default true) - tiled pattern across the whole image when on, single centered stamp when off.

Output is the watermarked IMAGE.

How it works

It builds a transparent overlay layer, draws the text (repeated with spacing if repeat is on), rotates the whole layer, then scales the text's alpha by opacity and alpha-composites it over the image. The tiled mode rotates a large canvas so the pattern stays dense after rotation - that's why a diagonal repeat doesn't leave big gaps. When repeat is off you get one centered, rotated label instead.

The pack's other features are mostly about making images good; this one is about marking them, and the mechanism is exactly as straightforward as it sounds.

The gotchas

Font handling is the weak spot. The code tries arial.ttf first, then a DejaVu path, then falls back to PIL's tiny default bitmap font. On Windows, arial is there and this is a non-issue. On Linux, if neither arial nor that specific DejaVu path exists, you get the default bitmap font, and at font_size 48 it looks like a pixelated afterthought. There's no font-picker input, so on a minimal Linux install you may need to install a TTF font in a location the code will find. If your watermark text renders blocky, that's the cause.

Also, the color list is five presets - you can't do a custom color or per-channel tint without editing the node. And like the rest of this pack, it's CPU-side PIL work: fine for a few images, slow for a large batch.

Installation

Part of Praveen's ComfyUI Tools. Install via ComfyUI Manager (search "Praveen" / "praveen-tools"), or:

cd ComfyUI/custom_nodes
git clone https://github.com/Praveenhalder/praveen-tools

Restart ComfyUI. No model downloads, no extra dependencies - Pillow ships with ComfyUI. For a quick visible watermark before you share a preview, it does the job; just don't ask it for custom fonts or colors.