PNG から GIF へのオンライン変換

PNG ファイルを GIF 形式に3ステップで簡単変換。

GIF⌄

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⚙ オプション設定

Resize

Color Filter

DPI

dpi

Crop (px)

PNG vs GIF：完全なフォーマットガイド

PNG

Lossless

圧縮

GIF

Lossless (LZW)

PNG

Full 8-bit alpha channel — each pixel can be any opacity level from fully transparent (0) to fully opaque (255)

透明度

GIF

Binary 1-bit transparency only — each pixel is either fully transparent or fully opaque (no partial transparency)

PNG

Not in standard PNG; APNG (Animated PNG) is a non-standard extension with limited, inconsistent support

アニメーション

GIF

Core feature — stores multiple frames with individual display timings, loop count, and optional per-frame color palettes

PNG

24-bit RGB (16.7M colors) or 32-bit RGBA (16.7M colors + full alpha); up to 48-bit for professional workflows

色深度

GIF

8-bit only — maximum 256 colors per frame (each frame may have its own 256-color palette)

PNG

100 KB – 10 MB — significantly larger than JPG for photographic content

ファイルサイズ

GIF

10–200 KB for static GIFs; 0.5 MB – 20 MB for animated GIFs

PNG

Universal — all modern browsers, operating systems, and devices including IE7+

ブラウザサポート

GIF

Universal — all browsers including IE5, all operating systems, all mobile devices, all social media platforms

PNG

Graphics, logos, UI

最適な用途

GIF

Animations, icons

一般的なユースケース：PNG → GIF

🎬 Animated social content🎭 Pixel art and retro graphics💬 Reaction GIFs for messaging🌐 Universal compatibility fallback

⚠️Full-color PNG photographs converted to GIF will show significant color banding due to the 256-color limit. GIF conversion works best for PNG images that already use fewer than 256 distinct colors.

Format

PNG

PNG was created in 1996 as a free, patent-unencumbered alternative to GIF after Unisys enforced its LZW compression patent. The PNG Development Group introduced full-color support, genuine alpha trans…

長所

+Lossless — every pixel preserved with zero compression artifacts

+Full 8-bit alpha channel for smooth, semi-transparent edges

+Ideal for text, logos, and graphics where sharpness is non-negotiable

+Unlimited re-saves without any quality degradation whatsoever

制限事項

−3–5× larger than JPG for photographic content

−No native animation support in standard PNG

−Slower to load than WebP for equivalent image content

−Not practical for very high-resolution photographs at web scale

Logos, icons, and brand marks placed over any background colorScreenshots where text must remain perfectly sharpImages edited in multiple passes (keep as the master file)Web UI elements, buttons, icons, and interface assets

Format

GIF

GIF was invented by CompuServe engineer Steve Wilhite in 1987 for transmitting images over slow modem connections. Its 256-color limit reflected the monitor technology of that era. A 1990s patent disp…

長所

+Universal support on every device and platform ever made

+Animation support with per-frame timing and seamless looping

+Excellent LZW compression for images with large areas of solid color

+Binary transparency works cleanly for logos on solid backgrounds

制限事項

−Hard 256-color limit causes visible banding and dithering on photographs

−Binary transparency only — no anti-aliased edges on variable backgrounds

−Animated GIFs are very large compared to animated WebP or MP4 video

−Color quantization permanently destroys photographic color quality

Simple animations requiring universal cross-platform compatibilityIcons and logos using 16 or fewer distinct solid colorsReaction GIFs and memes where universal sharing compatibility is essentialPixel art and intentionally retro-styled graphics

フォーマットガイド

PNG から GIF：完全変換ガイド

GIFはすべてのブラウザ、メールクライアント、ソーシャルプラットフォームでユニバーサルサポートを持つウェブのネイティブアニメーション形式です。PNGフレームをGIFに変換すると、マーケティングバナー、メールキャンペーン、製品デモのためにループアニメーションを作成できます。

なぜ PNG を GIF に変換するのか？

🔄

ループアニメーション

複数のPNGフレームを滑らかなGIFループに連結して、バナー、ローディングインジケータ、デモを作成します。

📧

メールアニメーション

GIFはOutlookを含む実質的にすべてのメールクライアントで再生される唯一のアニメーション形式です。

📱

ソーシャルメディア

Twitter、Facebook、LinkedInはGIFファイルを自動再生します——エンゲージメントコンテンツに理想的です。

🎨

ピクセルアート

GIFの256色パレットと小さいサイズは、ピクセルアートとレトロスタイルグラフィックスに理想的です。

PNG

ファイル拡張子.png
説明PNG (Portable Network Graphics) is a lossless raster image format that supports transparency. Ideal for graphics, logos, icons, and images that require a transparent background.
関連プログラムAdobe Photoshop, GIMP, Microsoft Paint, Preview (Mac)
開発者PNG Development Group
MIME タイプimage/png

GIF

ファイル拡張子.gif
説明GIF supports up to 256 colors and lossless data compression. Widely used for animations on the web.
関連プログラムAdobe Photoshop, GIMP, Preview (Mac), Most Web Browsers
開発者CompuServe
MIME タイプimage/gif