100% In-Browser Privacy
📐 2026 Standards
Social Media Asset Resizer
One-click auto-fit and smart crop for YouTube banners, Twitter/X headers, Instagram posts, and LinkedIn cards with zero server uploads.
Drag & Drop Your High-Res Image Here
Upload photos or banner artwork (PNG, JPG, WebP). Best results with 2560px or wider images.
2026 Social Media Image Dimension Cheat Sheet
Official recommended dimensions, aspect ratios, and safe text zones for major platforms:
| Platform | Asset Type | Dimensions (px) | Aspect Ratio | Safe Zone / Notes |
|---|---|---|---|---|
| YouTube | Channel Banner | 2560 × 1440 | 16:9 | Center 1546 × 423 px safe on all mobile/desktop devices |
| YouTube | Video Thumbnail | 1280 × 720 | 16:9 | Min width 640px, under 2MB |
| Twitter / X | Header Banner | 1500 × 500 | 3:1 | Bottom-left profile avatar overlaps 400 × 130 px area |
| Twitter / X | In-Stream Post | 1200 × 675 | 16:9 | Optimal desktop and mobile timeline display |
| Square Post | 1080 × 1080 | 1:1 | Standard grid aesthetic | |
| Portrait Post | 1080 × 1350 | 4:5 | Takes up maximum vertical screen height in feed | |
| Story & Reel | 1080 × 1920 | 9:16 | Keep critical UI out of top 250px and bottom 250px | |
| Personal Banner | 1584 × 396 | 4:1 | Avatar cuts into lower left on desktop profiles | |
| Feed Shared Post | 1200 × 627 | 1.91:1 | High engagement business preview card |
Why does YouTube cut off my channel banner on mobile?
YouTube banners display at 2560×1440 on 4K TVs, but crop inward to a central 1546×423 px safe area on smartphones. PrivToolbox automatically centers your artwork so key titles and logos remain clearly visible on any device.
What is the difference between "Smart Center Crop" and "Pad Letterbox"?
Smart Center Crop (Cover) zooms and scales your image so it completely fills the target dimensions without borders or empty bars. Pad Letterbox (Contain) shrinks the entire picture to fit inside the canvas and fills remaining margins with a neutral backdrop.
Are my creative assets or drafts uploaded to your server?
No. PrivToolbox processes all resizing entirely inside your local browser using HTML5 Canvas bicubic interpolation. Your original drafts, sketches, and copyrighted photos never leave your device.
Can I batch download all resized formats at once?
Yes! Check the presets you need and click Download ZIP to receive a clean, organized archive containing all target sizes ready for immediate upload to YouTube, X, and Instagram.