Social Media Post Preview
Visualize your social media content before publishing. A high-fidelity mockup generator for Instagram, Twitter (X), Facebook, and LinkedIn with carousel support, dark mode, and aspect ratio safety checks.
About
In the high-stakes environment of digital marketing, visual fidelity is non-negotiable. A post that is cropped awkwardly or has illegible text due to background contrast can reduce engagement rates by up to 40%. This tool is designed for Social Media Managers and Content Creators who need pixel-perfect assurance before scheduling content.
We solve the "Headless Crop" problem - where the 4:5 feed ratio cuts off essential visual elements - and simulate the user experience across different devices and themes. By utilizing browser-based rendering, your assets remain private and are never uploaded to a server.
Formulas
The core logic for safe-zone calculation relies on determining the crop factor C based on the input image dimensions w (width) and h (height) versus the target aspect ratio R.
For Instagram Portait mode (4:5), the vertical coverage is calculated as:
Reference Data
| Platform | Placement | Aspect Ratio | Dimensions (px) | Max Caption |
|---|---|---|---|---|
| Feed (Square) | 1:1 | 1080 × 1080 | 2,200 chars | |
| Feed (Portrait) | 4:5 | 1080 × 1350 | 2,200 chars | |
| Twitter (X) | Timeline | 16:9 | 1200 × 675 | 280 chars |
| Shared Image | 1.91:1 | 1200 × 630 | 63,206 chars | |
| Update | 1.91:1 | 1200 × 627 | 3,000 chars | |
| Stories | Vertical | 9:16 | 1080 × 1920 | N/A |