画像形式変換
無料の画像形式変換ツール。調整可能な品質でPNG、JPG、WebPの間で画像を変換します。100%クライアントサイドで、画像があなたのデバイスを離れることはありません。
Runs in your browserUpdated Apr 26, 2026
Settings
Drop a file or click to browse
PNG, JPG, WebP, GIF, BMP — max ~50MB
Up to 25 MB · processed locally in your browser
Result
Upload an image and click Convert.
よくある質問
›Are my images uploaded?
No — conversion happens entirely in your browser. Files never leave your device.
›Which formats are supported?
PNG, JPG and WebP for input and output. SVG input is supported too (use the SVG to PNG tool for that direction).
›What quality should I pick for JPG/WebP?
70-85% is the sweet spot for photos — visually indistinguishable from the original at much smaller file sizes.
›Why convert to WebP?
WebP files are typically 25-35% smaller than JPG at the same visual quality. Universally supported in modern browsers.
›Is the converter free?
Yes — fully free, no signup, no upload limits.