Convert JPG to PNG
Produce a lossless PNG copy — useful for editing pipelines and tools that only accept PNG.
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対応形式: JPG
ローカルで処理します。画像が端末の外に出ることはありません。
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Converting JPEG to PNG will not recover quality. The detail a JPEG discarded when it was first saved is gone, and wrapping those pixels in a lossless container cannot bring it back — it just stores the imperfect result faithfully.
That is still genuinely useful. PNG is the right destination when you are about to do repeated edits and do not want to accumulate JPEG generation loss, when you need an alpha channel to cut something out, or when a tool or platform simply refuses anything else.
できること
No further generation loss
Once it is a PNG, saving it again does not degrade it. Useful as an intermediate step across several edits.
Alpha channel available
PNG can hold transparency, so the converted file is ready for cut-outs and overlays.
Required by some tools
Plenty of design tools, icon pipelines and print workflows accept PNG only.
Pixel-exact conversion
The PNG encoder is lossless, so the output matches the decoded JPEG pixel for pixel.
使い方
- 1
Load the JPG
Decoded by the browser, with its orientation tag already applied.
- 2
Convert
The pixels are written into a PNG container. No quality setting is needed — PNG has none.
- 3
Download
You get a lossless copy, ready for whatever comes next.
KaiConvert を選ぶ理由
- ローカルツールはアップロード不要
- ページ読み込み後はオフラインでも動作
- クラウド AI は開始前に必ず明示