Image Format Converter
画像Convert between PNG, JPEG and WebP and see exactly how the file size changes before you download.
正在加载工具…
使い方
4 ステップ- 01
Upload an image — the original format is detected and a sensible target is pre-selected
- 02
Pick one of the three format cards; conversion re-runs automatically
- 03
Adjust quality for JPEG and WebP; PNG is lossless so the slider is disabled
- 04
Watch the size comparison, then download or copy the result
よくある質問
2 件の質問
Q1Why only three formats?
Because the browser can only encode these three. BMP, TIFF, ICO and AVIF encoding is not part of the Canvas API — tools that claim otherwise are usually uploading your file to a server.
Q2Why did the file get bigger when I chose PNG?
Your source was probably a compressed JPEG. Converting to a lossless format preserves all that data, so the file grows. To shrink, convert to WebP instead.