Resize Images for Social Media
One-click presets for Instagram, YouTube, LinkedIn, Twitter/X, Facebook, TikTok, and Pinterest. Perfect dimensions every time, 100% free and private.
画像をアップロード
JPG, PNG, WebP, PDFに対応
ここに画像をドラッグ＆ドロップするか、クリックして選択
⚡ Quick Resize Presets
Social Media Image Size Guide (2024–2025)
| Platform | Use | Pixels (W × H) | Aspect Ratio |
|---|---|---|---|
| 📱 Instagram Post | Square feed post | 1080 × 1080 | 1:1 |
| 📱 Instagram Portrait | Vertical feed post | 1080 × 1350 | 4:5 |
| 📱 Instagram Story / Reel | Full-screen vertical | 1080 × 1920 | 9:16 |
| ▶️ YouTube Thumbnail | Video preview | 1280 × 720 | 16:9 |
| ▶️ YouTube Banner | Channel art | 2560 × 1440 | 16:9 |
| 💼 LinkedIn Profile | Profile picture | 400 × 400 | 1:1 |
| 💼 LinkedIn Banner | Cover image | 1584 × 396 | 4:1 |
| 🐦 Twitter/X Header | Profile header | 1500 × 500 | 3:1 |
| 📘 Facebook Cover | Page cover photo | 1200 × 630 | ~1.91:1 |
| 🎵 TikTok Video | Full-screen vertical | 1080 × 1920 | 9:16 |
| 📌 Pinterest Pin | Standard vertical pin | 1000 × 1500 | 2:3 |
| 🔗 Open Graph / OG | Social share preview | 1200 × 630 | ~1.91:1 |
All presets are built into Resize4U's Quick Presets panel. Upload your image and select the platform — done.
Tips for better social media images
Use the right aspect ratio
Platforms crop images that don't match their expected ratio. Using the correct size stops awkward cropping and keeps your content looking professional.
Prefer JPG or WebP for photos
JPG offers the best quality-to-size ratio for photos. WebP is even smaller but some older tools don't support it. PNG is best reserved for logos and graphics.
Keep file sizes reasonable
Social platforms re-compress uploads, which can hurt quality. Starting with a well-compressed image (80–85% quality) gives the platform less work to do.
High DPI for retina screens
Export at 2× the display size (e.g. 2160×2160 for an Instagram post displayed at 1080) for crisp rendering on high-DPI phones and monitors.
Resize4Uが選ばれる理由
100% プライバシー保護
すべての処理がブラウザ内で完結。画像がサーバーに送信されることは一切ありません。
超高速処理
アップロード待ち時間ゼロ。お使いの端末で瞬時に画像処理を行います。
完全無料
会員登録不要、課金なし、制限なし。いつでも気軽にご利用いただけます。
パスポート写真、履歴書、ビザ申請、試験フォーム、SNS投稿に最適
JPG, PNG, WebP, PDF対応 • 寸法指定または目標容量指定で圧縮 • 切り抜きと回転
Frequently Asked Questions
Everything you need to know about resizing and compressing images with Resize4U.
Is my data safe? Do you store my photos?▼
100% safe. Resize4U works entirely in your browser using client-side JavaScript. Your images are never uploaded to any server, stored in any database, or seen by anyone else. You can even use this tool offline without an internet connection.
What is the best format for resizing images?▼
For photos and complex images, JPEG offers the best balance of quality and small file size. For logos, graphics, and images with transparency, use PNG. WebP is the modern standard that gives superior compression for both photos and graphics with full transparency support.
How do I resize an image to a specific file size (e.g., under 50KB)?▼
Upload your image, enter your target file size in the "Target File Size" box (e.g., 50 KB), and click "Resize & Compress". Resize4U will automatically adjust the image quality and dimensions to meet your exact requirement.
What DPI should I use for printing vs web?▼
For web, social media, and screen display, 72 or 96 DPI is standard. For high-quality printing (passport photos, documents, photo prints), use 300 DPI. For standard document printing, 150 DPI is sufficient.
Can I resize photos for official documents like passports and visas?▼
Yes! Use our built-in presets for US Passport (2x2 inches / 51x51mm), EU Passport (35x45mm), Indian Passport, Schengen Visa, and more. All presets automatically apply the correct 300 DPI print standard.
Is there a limit on how many images I can resize?▼
No limits at all. You can resize as many images as you want, anytime, completely free without creating an account or subscribing.