Convert Images to WebP
🔒ブラウザ内処理
Batch convert JPG, PNG, GIF, BMP, and AVIF images to WebP entirely in your browser. Files are never sent to any server.
ファイルをドラッグ&ドロップ
またはクリックしてファイルを選択
Supported: JPG, PNG, GIF, BMP, AVIF / Up to 20 files / Max 50MB per file
よくある質問
Are files really not uploaded?
Correct. Open DevTools (F12) → Network tab. No upload occurs.
Why convert to WebP?
WebP is typically 25–35% smaller than JPG at equal quality, which helps page speed and Core Web Vitals.
Is PNG transparency preserved?
Yes. WebP supports an alpha channel, so transparent areas are kept.
What about animated GIFs?
Only the first frame is converted to a still WebP. Animation is not preserved.
Are there file limits?
Up to 50MB per file, up to 20 files at once, downloadable together as a ZIP.
How do I convert WebP back to JPG or PNG?
Use the Image Convert tool to convert WebP to JPG or PNG.