The Ultimate Guide to Instagram Post Size 2025
With every social media platform having its own preferred upload sizes and aspect ratios, it can be a real headache remembering which is which, especially when it suddenly changes, like with Instagram this year. But don’t worry, we’ve got you covered with everything you need to know about the correct Instagram post size in 2025.
Does Size Matter?
Getting your post size right on Instagram isn’t just about aesthetics—it affects your visibility and engagement too. Here’s why:
- Wrong-sized posts are penalised by the algorithm.
- In grid view, poorly sized posts can be cropped in all the wrong places.
- Posts that are too long or too big might require cropping, or won’t be uploaded at all.
Instagram has 2 main sizes: posts and reels/stories.
Ideal Instagram Post Size
The best Instagram post size in 2025 is 1080 x 1350 pixels (4:5 aspect ratio).
While 1080 x 1080 (1:1) used to be the norm, Instagram now favours taller posts for the main feed. You can still upload square images, but keep in mind that your profile grid will crop the sides.
Instagram accepts higher-resolution uploads, but anything above 1080 x 1350 will be automatically compressed, so there’s no benefit in going higher.
Instagram Stories & Reels Size
For stories and reels, the ideal size is 1080 x 1920 pixels (9:16 aspect ratio), and a frame rate of 30fps.
Reels can be between 15 seconds and 3 minutes long.
Stories are capped at 60 seconds per slide.
Videos with a different frame rate will be converted to 30fps during upload, which could affect how they play back.
If you’re creating content for Instagram, sticking to the correct sizes ensures your posts look their best and perform well. Bookmark this guide so you’re always one step ahead!
Want to stay further ahead? Check out our Instagram statistics!