PNGをオンラインで圧縮

Smart PNG compression with lossy and lossless modes. Free, private, browser-based.

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画像をドラッグ＆ドロップするか、 ファイルを参照

Supports PNG files

Why compress PNG images?

PNG images often contain unnecessary metadata and can be compressed further without visible quality loss. Our lossy mode reduces colors intelligently, while lossless mode strips hidden data. Both modes preserve transparency — essential for logos, icons, and web graphics.

PNGとJPEGとWebPの使い分け

  • JPEG: Best for photographs. Smaller files but no transparency support.
  • WebP: Modern format supporting both lossy and lossless with transparency. Smaller than PNG and JPEG in most cases.
  • PNG: Best for graphics with transparency, text, logos, screenshots, and images requiring perfect clarity.

PNG圧縮の解説

PNG uses DEFLATE lossless compression. Our lossy mode reduces the color palette (quantization) before PNG encoding, dramatically shrinking files. 可逆 mode re-encodes the PNG with optimized compression settings, stripping unnecessary metadata.