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画像をオンラインで無料圧縮 — JPG、PNG、WebPを最大80％削減、品質劣化最小限。スマート最適化、一括処理、比較プレビュー機能付き。
画像 圧縮 is a free online 画像 tool that runs entirely in your browser — your files never leave your device and are never uploaded to any server. No installation, no signup; works on both phone and desktop, ready to use instantly.
画像処理は Canvas API と WebAssembly を通じてローカルで行われ、バッチ処理に対応しています。ダウンロード前に結果を即座にプレビューできます。
We noticed most image compressors upload files to servers. Since privacy is our core principle, we built this tool to process everything locally using Canvas API and WebAssembly.
Designers, content creators, and web developers optimizing visual assets for the web. Whether you need to process an image for a blog post, a product listing, or a responsive layout, this browser-based tool gives you instant results without installing desktop software.
はい、完全無料で登録不要です。
はい、モバイルブラウザでタッチ操作に対応しています。
画像
ツールには品質コントロールが用意されており、ファイルサイズと画質のバランスを調整できます。
ToolPure supports JPG, PNG, WebP, AVIF, GIF, and BMP formats. You can convert between any of these formats and adjust quality from 10% to 100% for optimal file size.
Yes, you can upload and process up to 100 images simultaneously. Batch operations include compression, format conversion, and resizing with a single quality setting applied to all files.
Both options are available. For JPG and WebP, you can choose lossy compression with adjustable quality. For PNG, lossless compression is used. AVIF supports both modes depending on your quality settings.
Yes. 画像 圧縮 runs entirely in your browser: files you select are never uploaded to any server — all processing happens in your device's memory and is wiped when you close the page.
🔒 Privacy & Security：All processing happens locally in your browser. Files are never uploaded or stored.
🔒 Privacy: All processing happens locally in your browser. Your files and data never leave your device — no upload, no server, no tracking.
画像 圧縮 is a free alternative to the following paid tools — see the full comparison: