How do I install the Watermark skill?

Run npx skillmds@latest add jperrello/watermark in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

Is Watermark safe to use?

This skill has not completed SkillMD's automated safety review yet. SkillMD never runs a skill's scripts for you; review the SKILL.md before installing.

Which AI agents work with Watermark?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is Watermark free to use?

Yes. Installing skills from SkillMD is free, and the skill stays under its author's original license.

Who published Watermark?

jperrello (@jperrello) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Watermark by jperrello — Agent Skill

Name: Watermark
Author: jperrello

Watermark

Overlay the persistent @C0BALT_CUT channel watermark at the BOTTOM of a finished short — the vertical opposite of source-credit's top banner. Renders the handle as a transparent PNG via PIL (Impact, Platinum

jperrello f9ba7c2 3 files · 4.7 KB Updated Sep 17, 2026

File contents

watermark

Persistent channel branding. "@C0BALT_CUT" in Impact at ~2% of frame height, Platinum white with the 0 in Sapphire Glow (brand/BRAND.md palette), thin black stroke, semi-transparent (alpha ≈200) so it reads without competing with captions. Same renderer pattern as source-credit (PIL PNG, ffmpeg overlay) because the local ffmpeg has no libass/drawtext.

Invoke

.claude/skills/watermark/watermark.sh <input> <out>

input: video to overlay onto (any aspect ratio; designed for 1080x1920)
out: output mp4

Output

mp4, same dimensions and duration as the input, video re-encoded, audio stream-copied. Cache: skip rebuild when out is newer than input. Prints the output path to stdout.

Geometry

Mark is bottom-anchored at y = 97.5% of frame height, centered horizontally — for a 1080x1920 short the text baseline sits around y=1830. Captions live in the lower third (≈y=1344) and the source credit is a top chyron (y≈77), so the mark collides with neither. The CTA overlay (last ~4s) composites AFTER this skill in the chain, so it covers the mark briefly — intended, the CTA is the louder ask.

Frequently asked questions