An image converter that turns one PNG into a browser favicon and related device icons. A favicon is the small image shown in a browser tab; the generated files also cover iOS, Android, and installable web apps.

Use it when adding a site icon, phone home-screen icon, or progressive web app icon set from a single source image.

It removes the need to create and resize each icon file by hand. It is intended for Next.js projects using the App Router, but can be used in other web projects.

png2ico — Skill for Claude Code by owenmorgan/claude-skills

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent

npx skills add owenmorgan/claude-skills --skill png2ico

Clone the repo

git clone --depth 1 https://github.com/owenmorgan/claude-skills

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/owenmorgan/claude-skills/png2ico/github.svg)](https://agentmods.dev/skills/owenmorgan/claude-skills/png2ico)

Your own site

<a href="https://agentmods.dev/skills/owenmorgan/claude-skills/png2ico"><img src="https://agentmods.dev/badge/skills/owenmorgan/claude-skills/png2ico/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/owenmorgan/claude-skills/png2ico"><img src="https://agentmods.dev/badge/skills/owenmorgan/claude-skills/png2ico.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 5 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,682 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00005	$0.01682
Opus 5.5	$0.00002	$0.00673
Sonnet 5.5	$0.00001	$0.00336
Haiku 4.5	$0.00001	$0.00168

Measured 2mo ago against content hash bddfa94bfa7d, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

png2ico scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.

The scan reads SKILL.md. This mod also ships 1 executable file (scripts/png2ico.py), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

skills/png2ico/SKILL.md · 180 lines

How it starts

The opening of the file, as written. The whole thing — 180 lines — stays where its author put it; the contents beside it link to each section on GitHub.

png2ico — Favicon & Icon Set Generator

Generate favicon.ico and a complete icon set from a source PNG. Optimised for Next.js App Router but works for any web project.

Generated files

File	Size(s)	Purpose
`favicon.ico`	16/32/48	Browser tab icon (multi-size ICO)
`icon.png`	32x32	Browser fallback icon
`apple-icon.png`	180x180	iOS home screen
`icon-192x192.png`	192x192	Android home screen / PWA
`icon-512x512.png`	512x512	PWA splash / install dialog

Setup check

Before first use, verify dependencies are installed:

python3 -c "from PIL import Image; print('ok')" && (magick --version || convert --version)

If anything is missing:

pip install Pillow && brew install imagemagick

Script location

The conversion script is at ${CLAUDE_SKILL_DIR}/scripts/png2ico.py.

Workflow

1. Detect project context

Check if the current working directory is a Next.js App Router project:

ls package.json next.config.* app/layout.* 2>/dev/null

If app/layout.tsx (or .jsx, .ts, .js) exists, this is a Next.js App Router project. Set IS_NEXTJS=true for later steps.

2. Find or confirm the source image

If the user provided an image path, use it directly.
If no image was provided AND IS_NEXTJS=true:
- Look for an existing logo or icon in the project: Glob for **/*.png, **/*.svg in common locations (public/, app/, assets/, src/).
- Look for the largest square-ish PNG that could be a logo. Exclude screenshots, photos, and tiny images.
- If a candidate is found, confirm with the user: "I found public/logo.png (512x512) — shall I use this as the source for your icons?"
- If no candidate is found, ask the user to provide a source image.
If no image was provided AND IS_NEXTJS=false, ask the user to provide a source image.

Ideal source: square PNG, 512x512 or larger.

3. Generate the icon set

python3 "${CLAUDE_SKILL_DIR}/scripts/png2ico.py" <input> -o <output-dir>

Read the full file on GitHub · 180 lines

Files

What ships with it

2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

2mo ago First seen · 180 lines · 0 tokens per session scan A bddfa94bfa7d

Subscribe to this mod's changes

png2ico is a skill published in the GitHub repository owenmorgan/claude-skills (2 stars, last pushed 7mo ago), licensed MIT. It adds 5 tokens to every session and 1,682 once invoked, about $0.0000 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

Design and UX Frontend

png2ico next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
png2icoowenmorgan/claude-skills	Skill	2	7mo ago	MIT	A	5	Claude Code
webgl-holographic-foilnexu-io/open-design	Skill	106k	today	Apache-2.0	A	41	Claude Code, Codex
html-ppt-hermes-cyber-terminalnexu-io/open-design	Skill	106k	today	Apache-2.0	A	53	Claude Code, Codex
html-ppt-taste-brutalistnexu-io/open-design	Skill	106k	today	Apache-2.0	A	78	Claude Code, Codex
visual-ralphYeachan-Heo/oh-my-codex	Skill	34k	today	MIT	A	52	Codex
glance-canonical-layoutsandroid/skills	Skill	10k	yesterday	Apache-2.0	A	56	Claude Code
accessibilitymicrosoft/hve-core	Skill	1.6k	today	MIT	A	47	Claude Code