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JPGからPNGへの変換

JPG画像を完全な透過対応のPNG形式に変換。無料で高速、ブラウザ上で動作。サーバーへのアップロード不要、あらゆるデバイスで即時変換。

無料100%プライベートアップロード不要

画像をここにドロップ

ファイルをドラッグするかクリックして選択

またはファイルをドロップ

よくある質問

Why convert JPG to PNG?

PNG supports transparency and uses lossless compression, making it ideal for logos, icons, screenshots, and graphics that need sharp edges. JPG loses quality on each save; PNG preserves every pixel.

Will the file size increase?

Usually yes — PNG files are larger than JPG because PNG uses lossless compression. For photos, PNG can be 3-5x larger. For graphics with flat colors, the difference is smaller.

Will I get transparency from a JPG?

No — JPG has no transparency data. The converted PNG will have the same solid background as the original JPG. To add transparency, use an image editor after conversion.

使い方

1

Upload JPG

Drag and drop your JPG/JPEG file or click to select from your device.

2

Convert

Click the Convert button. The conversion is instant and happens in your browser.

3

Download PNG

Download your lossless PNG file. Perfect for editing, transparency work, or archiving.

ヒントと最適な設定

When to Use

Convert to PNG when you need: transparency support, lossless quality for editing, sharp text/lines in screenshots, or pixel-perfect graphics. Keep JPG for photos shared on social media.