If you manage an Instagram account, you have probably wondered whether leaning into Reels quietly punishes your photo posts, or whether ignoring Reels means missing out on reach for everything else you publish. Adam Mosseri, Instagram’s Head, addressed this directly during one of his Friday Q&A sessions, and the short answer is no, they do not compete against each other.
What he actually said: “it’s one ranking system that tries to understand what people like.”
There is only one ranking system
Instagram does not run separate algorithms for photos, Reels, and carousels. It runs a single ranking system that tries to understand what a specific person finds interesting, and then shows that person more of it, regardless of format. Instagram’s own Ranking Explained post confirms this same principle in more detail. The system is built around relevance to the viewer, not around rewarding or punishing a particular content type. This matters because it changes how you should think about strategy. You are not choosing between two competing systems every time you hit publish, you are feeding one system information about what your audience likes.
Why engagement often transfers across formats
Because the ranking system tracks interest at the account and topic level rather than the format level, engagement signals tend to carry over. If your audience regularly watches, comments on, or shares your Reels, that same audience is statistically more likely to also engage with your photos and carousels, since the system has already learned they find your account relevant. The reverse holds true as well. A strong photo post can lift the discoverability of a Reel you publish later, because the underlying signal being measured is interest in you, not preference for a format.
The myth worth retiring
A common belief is that “the algorithm favors Reels,” and there is a kernel of truth buried in it. Instagram does push video more aggressively in discovery surfaces like Explore, largely because video generates strong watch-time signals that are easy to measure and scale. But that is a discovery decision aimed at reaching new audiences, not a ranking bias against photos for people who already follow you. Confusing the two leads a lot of accounts to over-invest in Reels out of algorithm anxiety rather than because it actually fits their story. For a deeper look at how much format choice should even factor into your planning, see our piece on whether you need every Instagram format at all.
What this means for your content mix
The practical takeaway is to choose format based on what a piece of content needs, not based on a perceived scoring advantage. A product launch might be best told as a carousel walking through features. A behind-the-scenes moment might work better as a fast fifteen-second Reel. A strong quote or stat might land hardest as a single, well-designed photo. None of these choices carries a hidden penalty. What actually moves the needle is relevance, watch time, saves, and shares, not which button you tapped when you posted. It is also worth remembering that early performance is only part of the picture, our breakdown of first-hour engagement goes into why a slow start does not mean a format failed.
If you are managing this across multiple formats and multiple weeks, planning your mix inside a proper content calendarmakes it far easier to see whether your photo, Reel, and carousel performance actually differ for your specific audience, instead of guessing based on general advice.
Frequently asked questions
Does the Instagram algorithm prioritize Reels over photos? Not in terms of ranking for your existing followers.Instagram does favor video more heavily in discovery surfaces aimed at new audiences, but that is separate from how content is ranked for people who already follow you.
Will switching from photos to Reels lower my overall engagement rate? Not inherently. Engagement rates differ by format because the behaviors are different, but a strong Reels strategy does not come at the expense of your photo performance.
Can I mix formats without hurting my reach? Yes. Since there is one unified ranking system based on relevance, mixing formats is expected behavior, not a risk.
How does Instagram actually decide what to show someone? It predicts relevance based on a viewer’s past behavior with similar content and creators, using signals like watch time, likes, comments, saves, and shares, independent of format.
Ready to plan a content mix that actually reflects what your audience responds to, instead of chasing algorithm myths? Start free with Kontentino and build your Instagram calendar around real performance data.
