PNG から WebP への無料変換（一括対応）
PNGを同じ画質のまま約30%小さいWebPに変換。ブラウザ内で完結し、アップロードは一切ありません。
対応フォーマット：JPG/JPEG/PNG/WEBP/GIF/SVG/AVIF/HEIC/HEIF
画像をドラッグ＆ドロップ — すべて端末内で処理されます
機能
About 30% smaller
WebP uses a more modern compression algorithm, typically 25–35% smaller than PNG at the same quality.
Alpha channel preserved
Transparent areas are fully retained instead of being flattened to black like JPG.
Batch conversion
Drop in many PNGs or a whole folder, then download the results as a ZIP.
活用シーン
Web icons and sprites
Converting PNG sprites to WebP speeds up first paint while keeping transparency.
App icons and UI assets
Ship smaller assets to reduce bundle size and bandwidth usage.
よくある質問
Does converting PNG to WebP lose quality?
Not noticeably. WebP supports both lossy and lossless modes; at 85% quality the result is visually identical to the original. Use 100% quality for guaranteed lossless output.
Are my images uploaded to a server?
No. Conversion runs locally in your browser via WebAssembly. Your images never leave your device.
Is WebP supported everywhere?
WebP works in Chrome, Edge, Firefox and Safari 14+, covering over 97% of browsers.