png

.png — Portable Network Graphics

PNG Development Group · 1996

開発者

PNG Development Group

カテゴリ

画像

MIMEタイプ

image/png

初回リリース

1996

オープンフォーマット

はい

ファイルシグネチャ

89 50 4E 47 (‰PNG)

.pngファイルとは？

PNG (Portable Network Graphics) is a lossless image format designed as an improved, non-patented replacement for GIF. It supports full-color images with transparency (alpha channel), making it perfect for logos, icons, screenshots, and web graphics. Unlike JPEG, PNG preserves every pixel exactly, so images never lose quality when saved multiple times. The tradeoff is larger file sizes compared to JPEG for photographs.

.pngファイルを開くプログラム

プラットフォーム	プログラム
Windows	Windows Photos	無料
	Adobe Photoshop	有料
	GIMP	無料
	Paint.NET	無料
macOS	Preview	無料
	Adobe Photoshop	有料

.pngファイルのよくある問題

⚠️ Cannot open .png file

Install one of the recommended programs listed above. For a free option, try the first free program in the list.

⚠️ .png file is corrupted

Try re-downloading the file. If the file was transferred, ensure the transfer completed without errors.

よくある質問

What program opens .png files?▼

.png files can be opened with several programs. Windows Photos is one of the most popular choices.

Is .png a safe file format?▼

Generally yes, .png files are safe to open with appropriate software.

Can I convert .png to another format?▼

Yes, there are many online and offline tools available to convert .png files. Check the conversion section above for specific methods.

技術詳細

Portable Network Graphics files use the image/png MIME type and were first introduced in 1996 by PNG Development Group. The file can be identified by its signature: 89 50 4E 47 (‰PNG).

豆知識

Portable Network Graphics was first released in 1996 by PNG Development Group

セキュリティ情報

.png files are generally safe to open. However, always ensure your software is up to date to protect against potential vulnerabilities.