JPG画像をオンラインで無料PNG変換。登録不要。透過対応。高速ブラウザツール。 この無料のオンラインツールは、登録もソフトウェアのインストールも不要です。ブラウザで開くだけですぐに使えます。結果は迅速かつ安全に処理され、すべてのデータはお使いのデバイスで直接処理されます。
JPG to PNG 変換
JPG画像をオンラインで無料PNG変換。登録不要。透過対応。高速ブラウザツール。
JPG to PNG 変換の使い方
Upload JPG Images
Drag and drop or click to select JPG images you want to convert to PNG.
Choose PNG Options
Optional: enable background color replacement if your JPG needs a specific background.
Convert to PNG
Click convert. Each JPG is converted to lossless PNG format instantly in your browser.
Download PNG Files
Download your PNG files. Note: PNG files are usually larger than JPG due to lossless compression.
いつ使う？
Transparency Needed
PNG supports transparency. Convert JPG to PNG then edit with a background remover to create transparent images.
Graphic Design
PNG is preferred for design work because it preserves sharp edges and text quality without compression artifacts.
Archival Storage
PNG uses lossless compression, making it ideal for archiving original-quality images.
詳細情報
JPG to PNG Technical Details
JPG uses lossy DCT-based compression. Converting JPG to PNG does not recover lost data, but prevents further quality loss. PNG uses DEFLATE lossless compression. The resulting PNG will be larger than the original JPG because PNG stores all pixel data losslessly.
よくある質問
A: No. JPG already discards some data. Converting to PNG preserves the current quality but cannot restore lost details. PNG simply prevents further compression artifacts.
A: PNG uses lossless compression, storing every pixel exactly. JPG discards some data to achieve smaller files. This trade-off is by design.
A: Not automatically. The converted PNG will have an opaque background. Use our Background Remover tool after conversion to create transparency.
A: Yes, all conversions are completely free. No registration, no watermarks, and no usage limits.