What is the perfect size image to post on Reddit?

For a Reddit image post, the safest all-around size is 1200 × 675 pixels with a 16:9 aspect ratio, because it fits common feed previews cleanly and is widely recommended by current Reddit-focused guides.

Best practical choice

• 1200 × 675 px (16:9) is a strong default for general Reddit image posts.

• If you want a more square look, 4:3 also appears in recent guidance as a solid post format.

• For mobile-heavy viewing, keeping the main subject centered matters more than chasing a single “perfect” resolution, since cropping behavior can vary by layout and device.

Simple rule

• Use a high-resolution image.
• Keep it in 16:9 or 4:3.
• Make sure the key part of the image stays inside the middle area so it doesn’t get cut off in previews.

Easy recommendation

If you want one answer: upload 1200 × 675 px.

TL;DR

The most reliable Reddit post image size right now is 1200 × 675 pixels at 16:9.