4:5 Aspect Ratio Calculator + Bulk Resizer
Work out any 4:5 dimension, then resize or crop a whole folder of images to match — free, in your browser.
Work out any 4:5 dimension, then resize or crop a whole folder of images to match — free, in your browser.
The 4:5 aspect ratio is Instagram's optimal portrait format, allowing photos to take up maximum vertical space in users' feeds without being cropped. This slightly tall portrait orientation (4 units wide by 5 units tall) has become essential for social media marketing, mobile advertising, and portrait photography.
4:5 is the tallest shape Instagram will show in the feed without cropping, which is why it stops more scrollers than a square. Shoot or crop to 4:5 first, then batch-resize — going the other way costs you pixels you can never get back.
| Resolution | Name | Category | Megapixels | Resize to this size |
|---|---|---|---|---|
| 1080x1350 | Instagram Post | Social | 1.5 MP | Resize to this — 1080 by 1350 pixels, Instagram Post |
| 1200x1500 | Pinterest Pin | Social | 1.8 MP | Resize to this — 1200 by 1500 pixels, Pinterest Pin |
| 2160x2700 | High-Res Instagram | Social | 5.8 MP | Resize to this — 2160 by 2700 pixels, High-Res Instagram |
| 720x900 | Mobile Ad Standard | Social | 0.6 MP | Resize to this — 720 by 900 pixels, Mobile Ad Standard |
| 1440x1800 | Facebook Portrait | Social | 2.6 MP | Resize to this — 1440 by 1800 pixels, Facebook Portrait |
| 2400x3000 | 8x10 Print @ 300dpi | 7.2 MP | Resize to this — 2400 by 3000 pixels, 8x10 Print @ 300dpi | |
| 3600x4500 | 12x15 Print @ 300dpi | 16.2 MP | Resize to this — 3600 by 4500 pixels, 12x15 Print @ 300dpi | |
| 4000x5000 | 16MP High-Res | Camera | 20.0 MP | Resize to this — 4000 by 5000 pixels, 16MP High-Res |
Maximizes vertical presence in Instagram feeds for better engagement
Optimal format for mobile-first ad campaigns on social platforms
Tall format that stands out in Pinterest's vertical feed layout
Standard portrait print size used by photographers
4:5 is the tallest aspect ratio Instagram allows in the main feed. It takes up more screen real estate than square (1:1) or landscape photos, making posts more visible and potentially increasing engagement.
Studies suggest 4:5 vertical images can get up to 1.5x more engagement than square images because they occupy more screen space and stop scrollers longer. However, content quality matters most.
Instagram recommends 1080x1350 pixels for 4:5 portrait posts. While Instagram compresses images, uploading at this resolution ensures the best quality after compression.
Yes! 4:5 and 8:10 are the same ratio (8:10 simplifies to 4:5). This means photos shot for Instagram's optimal size will also perfectly fit standard 8x10 inch print frames.
Converting 16:9 to 4:5 requires significant cropping from both sides, as 16:9 is very wide and 4:5 is tall. You'll lose about 64% of the width. Consider if the main subject will still be visible after cropping.