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Use when converting PNG images in a directory tree to lossless WebP in place with `cwebp`, preserving original file timestamps, deleting the source PNG files only after successful conversion, and reporting the processed image count.
Codex または Claude でインストール この Prompt をコピーして Codex、Claude、または他のアシスタントに貼り付けると、Skill ページを確認してインストールできます。
SOC 職業分類に基づく
| name | convert-png-to-webp |
| description | Use when converting PNG images in a directory tree to lossless WebP in place with `cwebp`, preserving original file timestamps, deleting the source PNG files only after successful conversion, and reporting the processed image count. |
| license | MIT |
| metadata | {"author":"cssmagic"} |
Convert PNG files inside one directory tree to same-location .webp files:
Each run needs one directory to process.
If the directory is missing or ambiguous, ask the user for the path before running commands.
Normalize ~ and relative paths to an absolute path before reporting or running the script.
Treat PNG extensions case-insensitively.
Map each PNG to a same-directory, same-basename .webp file.
Do not overwrite existing .webp files unless the user explicitly allows overwrite behavior. If a mapped .webp already exists, report the exact PNG and WebP paths and stop before converting anything.
Reject symlinked PNG files before writing, because deleting a symlink after conversion is easy to misread.
Use the official WebP CLI:
command -v cwebp
The bundled script requires Python 3:
command -v python3
On macOS, creation-time preservation requires:
command -v GetFileInfo
command -v SetFile
If those macOS timestamp tools are unavailable, stop before converting anything.
Set the directory from the user's provided path:
dir="/absolute/path/to/directory"
Run the bundled script from this skill directory:
python3 scripts/convert_png_to_webp.py "$dir"
Only pass --overwrite if the user explicitly permits replacing existing mapped WebP files:
python3 scripts/convert_png_to_webp.py --overwrite "$dir"
The script performs preflight checks before writing:
During conversion, the script writes a temporary WebP beside the source file, syncs timestamps, atomically moves it into place, and only then deletes the source PNG.
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