What is image-converter?

A local image-conversion skill for macOS. It changes images between formats such as SVG, PNG, ICO, ICNS, JPEG, WebP, and PDF using installed tools.

It helps rasterize SVG files, resize or convert common images, create Windows ICO files, and create macOS ICNS files. It can also make preview images when other conversion methods fail.

It removes the need to remember different commands for each image format and helps produce platform-specific image files.

image-converter — Skill for Claude Code and Codex by penwyp: A local image-conversion skill for macOS.

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.

agentmods

npx agentmods add skills/penwyp/claudepreference/image-converter

Any agent

npx skills add penwyp/ClaudePreference --skill image-converter

Clone the repo

git clone --depth 1 https://github.com/penwyp/ClaudePreference

Made for: Claude Code, Codex.

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/penwyp/claudepreference/image-converter.svg)](https://agentmods.dev/skills/penwyp/claudepreference/image-converter)

Your own site

<a href="https://agentmods.dev/skills/penwyp/claudepreference/image-converter"><img src="https://agentmods.dev/badge/skills/penwyp/claudepreference/image-converter.svg" alt="Measured on agentmods" height="20"></a>

Per session 100 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,059 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. Scan, not verified.

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	$0.00100	$0.01059
Opus 5	$0.00050	$0.00530
Sonnet 5	$0.00020	$0.00212
Haiku 4.5	$0.00010	$0.00106

Measured 5d ago against content hash d4157a93eaff, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

image-converter 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 5d ago.

The scan reads SKILL.md. This mod also ships 1 executable file (scripts/convert-image.sh), 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/image-converter/SKILL.md · 99 lines

How it starts

The opening of the file, as written. The whole thing — 99 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Image Converter

Use this skill for local image format conversion on macOS.

Tool preference

Prefer tools in this order:

rsvg-convert for SVG to PNG when available. It gives predictable SVG rasterization.
magick for most conversions and for multi-size .ico.
sips for simple macOS-native PNG/JPEG/TIFF conversions and resizing.
iconutil for .iconset to .icns.
qlmanage -t only as a fallback preview renderer when SVG/PDF conversion tools fail.

Common macOS tool locations include:

/opt/homebrew/bin/rsvg-convert
/opt/homebrew/bin/magick
/usr/bin/sips
/usr/bin/iconutil
/usr/bin/qlmanage

Use command -v at runtime instead of hardcoding paths unless a command lookup fails.

Quick workflow

Inspect the input:
```
file input.svg
magick identify input.svg
```
If magick identify cannot read the file, use file only and continue with format-specific tools.

Convert with the bundled script when possible:

skills/image-converter/scripts/convert-image.sh input.svg output.png --size 800
skills/image-converter/scripts/convert-image.sh input.svg output.ico
skills/image-converter/scripts/convert-image.sh input.png output.icns

Verify output:

file output.png output.ico
magick identify output.png output.ico

Format notes

SVG to PNG: preserve transparency with rsvg-convert or magick -background none.
SVG/PNG to ICO: create a multi-resolution icon containing 256,128,64,48,32,16.
PNG to ICNS: create an .iconset with 16, 32, 64, 128, 256, 512, and 1024 pixel variants, then run iconutil -c icns.
JPEG output has no alpha channel. If converting transparent input to JPEG, flatten onto white unless the user specifies a background.
Do not overwrite source files unless the user explicitly asks. Same-stem outputs such as icon.svg -> icon.png are fine.

Guardrails

Never overwrite source files unless the user explicitly asks.
Never assume a tool is installed — check with command -v at runtime before using it.
When all conversion tools are missing, report which tools are needed and stop; do not silently fall back to a different output format.
For ICO/ICNS generation, always verify the output contains the expected sizes before reporting success.

Read the full file on GitHub · 99 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.

5d ago First seen · 99 lines · 100 tokens per session scan A d4157a93eaff

Subscribe to this mod's changes

image-converter is a skill published in the GitHub repository penwyp/ClaudePreference (137 stars, last pushed 3mo ago), licensed MIT. It adds 100 tokens to every session and 1,059 once invoked, about $0.0005 per session on Opus 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 2026-08-30.

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