Why Image Format & Size Matter on Social Media
Social media platforms automatically resize and compress images that don't match their specifications. When you upload an image that's too large or in the wrong format, the platform applies its own compression — often aggressively — resulting in blurry, artefact-heavy images. By uploading images at the exact recommended size and format, you:
- Prevent quality loss from platform-side recompression
- Ensure proper display across desktop and mobile
- Improve engagement — sharp, well-framed images get more clicks
- Load faster — properly sized images don't waste bandwidth
Facebook Image Sizes (2025)
| Type | Dimensions (px) | Aspect Ratio | Best Format |
|---|
| Profile Photo | 170 × 170 | 1:1 | PNG |
| Cover Photo | 820 × 312 | 2.63:1 | JPG |
| Feed Post (Square) | 1080 × 1080 | 1:1 | JPG / PNG |
| Feed Post (Landscape) | 1200 × 630 | 1.91:1 | JPG |
| Story / Reel | 1080 × 1920 | 9:16 | JPG / PNG |
| Shared Link Preview | 1200 × 630 | 1.91:1 | JPG |
Pro tip: Facebook compresses JPG images heavily. For images with text overlays or graphics, upload as PNG to preserve sharpness.
Instagram Image Sizes (2025)
| Type | Dimensions (px) | Aspect Ratio | Best Format |
|---|
| Profile Photo | 320 × 320 | 1:1 | JPG |
| Square Post | 1080 × 1080 | 1:1 | JPG |
| Portrait Post | 1080 × 1350 | 4:5 | JPG |
| Landscape Post | 1080 × 566 | 1.91:1 | JPG |
| Story / Reel | 1080 × 1920 | 9:16 | JPG / PNG |
| Carousel | 1080 × 1080 | 1:1 | JPG |
Pro tip: Portrait posts (4:5) take up more screen real estate in the feed and tend to get higher engagement than square posts.
Twitter / X Image Sizes (2025)
| Type | Dimensions (px) | Aspect Ratio | Best Format |
|---|
| Profile Photo | 400 × 400 | 1:1 | JPG / PNG |
| Header / Banner | 1500 × 500 | 3:1 | JPG |
| In-stream Image | 1600 × 900 | 16:9 | JPG / PNG |
| Card Image | 800 × 418 | 1.91:1 | JPG |
LinkedIn Image Sizes (2025)
| Type | Dimensions (px) | Aspect Ratio | Best Format |
|---|
| Profile Photo | 400 × 400 | 1:1 | JPG / PNG |
| Cover Image | 1584 × 396 | 4:1 | JPG |
| Feed Post | 1200 × 627 | 1.91:1 | JPG / PNG |
| Article Cover | 1200 × 644 | 1.86:1 | JPG |
| Company Logo | 300 × 300 | 1:1 | PNG |
Pinterest Image Sizes (2025)
| Type | Dimensions (px) | Aspect Ratio | Best Format |
|---|
| Standard Pin | 1000 × 1500 | 2:3 | JPG / PNG |
| Long Pin | 1000 × 2100 | 1:2.1 | JPG |
| Square Pin | 1000 × 1000 | 1:1 | JPG |
| Profile Photo | 165 × 165 | 1:1 | JPG |
JPG vs PNG vs WebP — Which to Use?
- JPG: Best for photographs. Small file size, no transparency. Use for most social media posts.
- PNG: Best for graphics, logos, and images with text. Supports transparency. Larger file size.
- WebP: Best compression with quality. Supported by most platforms now, but JPG/PNG are safer for maximum compatibility.
Optimisation Workflow for Social Media Images
- Create at the recommended size. Design your image at the exact platform dimensions listed above.
- Resize existing images to the target dimensions using our free Image Resizer.
- Compress to reduce file size without visible quality loss. Aim for under 200KB for feed images.
- Convert to the recommended format if needed (e.g., PNG to JPG for photographs).
- Upload to the platform. Pre-optimised images won't be recompressed as aggressively.
Key Takeaways
- Always upload at the exact recommended dimensions to prevent platform-side cropping and compression.
- Use JPG for photographs and PNG for graphics with text or transparency.
- Compress images before uploading to maintain quality control.
- Portrait-oriented images (4:5, 9:16) tend to get higher engagement on Instagram and Pinterest.
- Keep file sizes under 1MB for feed posts and under 200KB for thumbnails.