Choosing the right size and resolution before generating an AI image is critical for sharp, optimized results. Whether for social media, web, or print, each format has specific requirements worth knowing.
Key takeaways:
- Each aspect ratio (1:1, 16:9, 9:16) has specific uses depending on the platform
- Social networks require exact sizes to avoid cropping
- Web uses 72 PPI while print needs 300 DPI
- Generating at the correct size from the start saves time and quality
Common Aspect Ratios
The most used aspect ratios in AI images are: 1:1 (square, ideal for profiles and catalogs), 16:9 (landscape, perfect for covers and banners), 9:16 (vertical, Stories and reels), 4:3 (classic photography format), and 3:2 (standard DSLR camera ratio). With MitikAI you can select the ratio before generating, ensuring the composition fits perfectly in the final destination without needing to crop afterward.
Optimal Sizes per Platform
Each platform has recommended sizes: Instagram uses 1080×1080 for posts and 1080×1920 for Stories and Reels. TikTok shares the vertical 1080×1920 format. Facebook recommends 820×312 for covers and 1200×630 for link posts. Twitter works best at 1200×675, LinkedIn at 1200×627, and Pinterest stands out with vertical images at 1000×1500. Generating directly at these sizes with MitikAI avoids quality loss from rescaling and ensures important content is not cropped in previews.
Resolution: PPI, DPI and Quality
Resolution is measured in PPI (pixels per inch) for screens and DPI (dots per inch) for print. Web images work well at 72 PPI, while professional printing requires 300 DPI. AI-generated images typically have a native resolution of 1024×1024 or similar. If you need larger sizes for print or signage, consider upscaling with specialized tools, although it is always preferable to generate at the highest resolution possible from the start.
Optimizing Output
For the best result, choose the correct size before generating rather than rescaling afterward. Use WebP format for web, as it offers up to 30% smaller file size than JPEG at the same quality. For compression, maintain a balance between file size and sharpness: 80-85% quality is usually optimal for web. MitikAI generates optimized images you can download and use directly, without additional post-processing steps in most cases.
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Frequently Asked Questions
What size should I choose for Instagram?
For square posts use 1080×1080 (1:1). For Stories and Reels use 1080×1920 (9:16). Generating at the exact size avoids cropping and quality loss.
Can I print AI-generated images?
Yes, but you need at least 300 DPI for professional printing. Generate at the highest resolution possible and use upscaling if needed.
What file format is best for web?
WebP offers the best quality-to-size ratio. JPEG is the universal fallback. PNG is ideal if you need transparency.