AI vs GIF
Adobe Illustrator と GIF Image を徹底比較 — ファイルサイズ、品質、互換性、そして用途に応じた最適なフォーマットの選び方を解説します。
Adobe Illustrator
Raster & Vector ImagesAI (Adobe Illustrator) is a proprietary vector graphics format used by Adobe Illustrator for creating logos, illustrations, and print designs. Modern AI files are based on PDF internally and can contain both vector paths and embedded raster images.
AI ファイルについてGIF Image
Raster & Vector ImagesGIF supports animation and transparency with a 256-color palette. While limited in color depth, it remains the most universally supported animated image format across platforms and messaging apps.
GIF ファイルについて長所の比較
AI 長所
- Native format for Adobe Illustrator — full fidelity for every tool, effect, and layer.
- PDF-compatible since Illustrator 9 — any PDF reader can display a flattened preview.
- Supports art boards, symbols, brushes, gradient meshes, and effects.
- Professional print workflow integration — CMYK, spot colors, and color profiles are preserved.
- Tight Creative Cloud integration with Photoshop, InDesign, and After Effects.
GIF 長所
- Universal animation support — every browser, every chat app, every social network.
- Transparent backgrounds for compositing against any page color.
- Lossless for its limited palette — pixel-perfect at 256 colors.
- Self-contained: no codec, no browser plugin, no third-party player needed.
制限・弱点
AI 制限・弱点
- Proprietary — true editability requires Adobe Illustrator or a few niche alternatives (Affinity Designer, Inkscape partial).
- Browsers and lightweight viewers show only the flattened PDF preview, not layers.
- Old AI files (pre-v9) are PostScript-based and often unopenable in modern Illustrator.
- File sizes can balloon when multiple art boards embed hi-res raster images.
- Subscription-locked: no perpetual-license path to the full editor since 2013.
GIF 制限・弱点
- Limited to 256 colors per frame — looks posterized on photographs.
- Dithering for color-rich images makes files huge (often 10× an MP4 equivalent).
- No audio track.
- Transparency is 1-bit (on/off) — no smooth alpha blending.
- Poor compression compared to modern formats (WebP, MP4, AVIF).
技術仕様
| 仕様項目 | AI | GIF |
|---|---|---|
| MIME type | application/postscript or application/pdf (modern) | image/gif |
| Extensions | .ai | — |
| Current container | PDF 1.5+ (since Illustrator 9, 2000) | — |
| Legacy container | PostScript (pre-Illustrator 9) | — |
| Color modes | RGB, CMYK, Grayscale; supports spot colors and Pantone | — |
| Compression | — | LZW (lossless, patent expired 2004) |
| Color depth | — | 8-bit indexed (256 colors per frame) |
| Transparency | — | 1-bit (on/off) |
| Animation | — | Supported natively |
| Max dimensions | — | 65,535 × 65,535 per frame |
一般的なファイルサイズ
AI
- Logo with one art board 200 KB - 2 MB
- Full brand identity kit (multi art boards) 10-50 MB
- Complex illustration with embedded photos 100-500 MB
GIF
- Short reaction meme (2s loop) 500 KB – 2 MB
- Screen recording demo (10s) 3–15 MB
- Static transparent icon 2–20 KB
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1回限りの支払いで24時間、最大1GBのファイルおよび最大50ファイルの一括変換が利用可能です。
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よくある 質問
KaijuConverterにAIファイルをアップロードするだけで、ソフトをインストールせずにPDF、JPG、PNGなどの標準形式へ即座に変換できます。
KaijuConverterにGIFファイルをアップロードするだけで、ソフトをインストールせずにPDF、JPG、PNGなどの標準形式へ即座に変換できます。
はい、25MBまで完全無料（24時間パスやProプランでは最大1GB）で変換でき、アップロードされたファイルは60分後にサーバーから自動削除されます。
はい、25MBまで完全無料（24時間パスやProプランでは最大1GB）で変換でき、アップロードされたファイルは60分後にサーバーから自動削除されます。