ツールボックス
軽く、まっすぐ役に立ち、意図的に小さく作ったツールの置き場です。
PNG から JPG
Free online PNG to JPG converter that converts a single PNG image to JPG / JPEG directly in your browser, fills transparent areas with white, and never uploads your file.
WebP から JPG
Free online WebP to JPG converter that converts a single WebP image to JPG / JPEG directly in your browser for websites and apps that only accept JPG, without uploading your file.
HEIC から JPG
Free online HEIC to JPG converter that turns iPhone photos into JPG / JPEG locally in your browser for uploads, email, and cross-device sharing without uploading your file.
絵文字から SVG
Convert multiple emoji characters into individual SVG files in your browser, switch between Twemoji and OpenMoji styles, and download one by one or as a ZIP.
Gemini ウォーターマーク除去
Process a single Gemini image locally in the browser, remove the visible bottom-right watermark, and export the result without uploading it to the server.
画像プライバシーブラー
Pixelate private information in images — faces, license plates, text, and more. All processing happens in your browser, nothing is uploaded.
テキスト差分
2 つのテキストを行ごとに比較し、追加・削除・変更なしをすばやく確認します。
JS 難読化
ブラウザ内で JavaScript をローカルに難読化します。
HTML フォーマッター
乱れた HTML をブラウザ内で読みやすく整形します。
サイトマップビューア
Fetch a sitemap URL through the server, inspect prettified XML, and switch to a structured list view for sitemap entries.
Schema ビューア
Paste JSON-LD schema data, format it locally in the browser, and inspect a structured summary without sending it to the server.
世界時計
Track major global business cities in an electronic clock layout, keep daylight saving time and standard time correct automatically, and show only the cities you care about.
WordPress パスワードハッシュ生成
Manually reset or migrate WordPress 6.8+ user passwords by generating $wp$2y$ hashes locally in the browser, with side-by-side notes on modern bcrypt and legacy $P$ phpass hashes.
Why These Tools Exist
This directory is not a random pile of links. It collects workflows I repeatedly use while building the site, writing, preparing media, and debugging small problems. Each tool page explains the use case, processing model, limits, and common questions so visitors can decide whether it fits the task.
Processing And Privacy
When comparison, conversion, or formatting can run in the browser, the site keeps it local. Tool pages state what is not uploaded to this server, and tools that rely on third-party libraries or external capabilities include notes about their source and boundaries.
How To Pick A Tool
Image
Use these when PNG, WebP, HEIC, emoji assets, or similar files need to be prepared for upload, sharing, archiving, or a lightweight cleanup step.
Text
Use these when comparing revisions, formatting HTML, inspecting structured data, or checking whether text and code look right before publishing.
Utility
Use these for small maintenance tasks that do not deserve a full app, such as checking world times or generating a WordPress password hash.