The Instagram algorithm is not one algorithm. Instagram says each part of the app (Feed, Stories, Explore, Reels and Search) uses its own ranking system, tuned to how people use that surface. Feed and Stories mostly rank posts from accounts you follow by how likely you are to interact with them. Explore and Reels rank posts from accounts you don't follow by predicted likes, saves, shares and full watches. Original content gets recommended; reposts, watermarks and rule breaks don't.

By the end you'll know what each surface rewards, which popular tips are myths, and how to run a 4-week test that tells you what works for your own account.

There is no single Instagram algorithm

In his May 2023 update, Instagram Ranking Explained, Adam Mosseri wrote that "Instagram doesn't have a singular algorithm that oversees what people do and don't see on the app." Instead, Instagram uses "a variety of algorithms, classifiers, and processes, each with its own purpose." Each part of the app "uses its own algorithm tailored to how people use it."

That matters for you because a post can do well on one surface and badly on another. The Creators FAQ puts it plainly: Instagram has "different recommendation systems for different surfaces," and "engagement that takes place on each surface matters the most for that specific surface."

Every ranking system works in the same three steps, according to Instagram:

1. Build a pool. Instagram collects the candidate posts it could show you (recent posts from people you follow, plus recommendations).
2. Read signals. Instagram says there are "thousands" of signals, from when a post was shared to whether you're on a phone or the web.
3. Predict and sort. Instagram makes "roughly a dozen" predictions about what you'll do with each post (like it, share it, watch it to the end) and ranks the pool by those predictions, weighted by how much each action counts.

The practical question is always the same: on this surface, which predicted action counts most?

How Instagram ranks Feed

Feed is a mix of posts from accounts you follow, recommended posts from accounts you don't, and ads. It includes photos, videos and carousels.

The most important Feed signals, "roughly in order of importance," per Instagram:

1. Your activity. Posts you've liked, shared, saved or commented on.
2. Information about the post. How popular it is ("how quickly people are liking, commenting, sharing and saving"), plus when it was posted and any location tag.
3. Information about the person who posted. How many times people have interacted with that account in the past few weeks.
4. Your history with that person. For example, whether you comment on each other's posts.

The five Feed predictions Instagram watches most closely: how likely you are to spend a few seconds on the post, comment, like, share, and tap the profile photo. Instagram also avoids showing too many posts from the same account in a row, or too many suggested posts back to back.

Instagram also says it now considers format: "if we notice you prefer photos, we'll show you more photos." The Creators FAQ adds that Feed ranking "does not give preference to reels over photos." It predicts which format each person finds most valuable.

How Instagram ranks Stories

Stories come only from accounts you follow, plus ads. Instagram ranks the Stories tray with three input signals:

• Viewing history: how often you view that account's stories.
• Engagement history: how often you engage with them, such as sending a like or a DM.
• Closeness: your relationship with the author and how likely you are to be friends or family.

From those, Instagram predicts how likely you are to tap into a story, reply to it, or skip to the next one. For a business, this means Stories reward the followers who already talk to you. Question stickers that get replies work with the ranking, not around it.

How Instagram ranks Explore

Explore is almost entirely recommendations from accounts you don't follow yet. Instagram finds candidates by looking at posts you've liked, saved, shared and commented on, then ranks them.

The most important predicted actions in Explore are likes, saves and shares. The signals, in rough order:

1. Information about the post. How many people, and how quickly, are liking, commenting, sharing and saving it. Instagram says these popularity signals "matter much more in Explore than they do in Feed or in Stories."
2. Your activity in Explore. What you've interacted with there before.
3. Your history with the person who posted. Usually none, since you don't follow them.
4. Information about the person who posted. How much people have interacted with that account recently.

Explore content must also pass Instagram's Recommendation Guidelines. Posts that break them can stay on Instagram but won't be recommended to people who don't follow you.

How the Instagram Reels algorithm works

Reels is built for entertainment, and most of what people see there comes from accounts they don't follow. Instagram surveys viewers on whether a particular reel was worth their time or fun, and learns from the answers.

The most important Reels predictions, per Instagram: how likely you are to reshare the reel, watch it all the way through, like it, and go to the audio page (a proxy for wanting to make your own reel). The signals, roughly in order:

1. Your activity: reels you've liked, saved, reshared, commented on and engaged with recently.
2. Your history with the person who posted.
3. Information about the reel: the audio track, the visuals, and popularity.
4. Information about the person who posted: popularity signals such as follower count or engagement, used "to help find compelling content from a wide array of people and give everyone a chance to find their audience."

Instagram lists what makes a reel less visible: low resolution, watermarks, muted audio, borders, majority text, and reels "that have already been posted on Instagram." The Creators FAQ adds that Instagram recommends videos to "unconnected audiences" only when they are 3 minutes or less.

The FAQ's best practices for Reels reach, in Instagram's words: make the first 3 seconds engaging, upload the highest resolution possible, drive "authentic (ie. not clickbait) engagement," and like or reply to comments within the first 7 days.

How Instagram Search ranks accounts and posts

Instagram names Search as one of the surfaces with its own algorithm, but its current ranking explainer does not publish a signal list for it. What Instagram does say, in Tips for Improving Your Reach: followers and non-followers find you by searching, so include relevant keywords "in your content, your caption, your bio, and your hashtags."

Account Status also shows whether your account is eligible to appear in Search and as a suggested account, so a Search problem can be checked directly (more on that below).

Instagram ranking signals by surface

This table condenses Instagram's published signals and top predictions. Order follows Instagram's "roughly in order of importance" lists.

What changed in the Instagram algorithm from 2024 to 2026

The core signal lists above have been stable since 2023. What changed is who gets recommended and how creators can test.

Original content now counts for photos and carousels too

On April 30, 2026, Instagram announced it was extending its originality rules from reels (where they began in 2024) to photos and carousels. Accounts that "primarily post unoriginal content" in any of those formats "will no longer be shown in places where we recommend content." Instagram also reported that "75% of recommendations in the US" now come from original posts.

What doesn't count as original: re-uploading someone's work with only "a border, watermark, subtitles, or a credit in the captions." The original content guidelines give a useful test: "if someone could remove your contribution to your post or reel, and the content would virtually be the same, it probably needs more of you in it."

Recovery is defined too. An account becomes eligible again "when most of their recently posted photos, carousels, and reels are considered original in a 30-day period," calculated on a rolling basis. The rules don't affect how followers see your posts, only recommendations to non-followers.

Trial reels let small accounts test with non-followers

In December 2024 Instagram launched trial reels. A trial reel is shown to non-followers first and doesn't appear on your grid or to followers in Feed or the Reels tab unless you choose to share it with everyone. About 24 hours after posting you see views, likes, comments and shares. You can also let Instagram share it with followers automatically "if we determine it's performing well based on the views it receives within the first 72 hours." Trial reels need a professional account.

For small accounts this is the most useful change: you can test a new format on strangers first.

Views and engagement per viewer

Instagram's own tools now judge video by views. Trial reels auto-share based on views, and the Edits app now lets you compare up to 3 reels on views, watch time, follows and interactions.

For recommendations, the FAQ is specific: "the most important things we consider are how much engagement per viewer the content has received (through actions such as watch time, sharing, following, liking, commenting, profile visits, etc) and how likely the viewer will be to watch and engage." Per viewer is the key phrase. A reel shown to 500 people that 40 of them share beats a reel shown to 5,000 that 40 share.

Viewers can steer their own recommendations

Instagram has published a page about letting people control their Reels recommendations, described as a way to "personalize, adjust your interests, and enjoy more relevant recommendations." Viewers can already mark posts "Not Interested," add accounts to Favorites, switch to a Following feed (the last 30 days in chronological order), and snooze suggested posts for 30 days. For a creator, this means the people who see your posts are increasingly people who asked for your topic. Clear, consistent topics help.

Instagram algorithm myths, checked against Instagram's own words

Shadowbans. Instagram says hidden, unexplained limits are "not our intention" and "we don't suppress content to encourage people to buy ads." When reach is limited for a rule reason, Account Status shows it and lets you appeal. Most "shadowbans" are ordinary variation: a post that fewer people finish or share gets shown to fewer people.

Hashtag counts. Instagram says relevant, trending hashtags can help people interested in that topic find a reel, and irrelevant ones can hurt because the post gets shown to people who don't engage. Instagram capped posts at 5 hashtags in December 2025, so the old 30-hashtag habit is gone anyway. Our Instagram hashtags guide for 2026 covers how to pick the 5.

Posting daily. Instagram calls frequency "just one factor of many." Its data point: the creators with the highest net follower growth post, on average, 10 or more reels per month. That's 2 to 3 a week, not 7.

The first 30 minutes. Asked whether posts that get lots of reactions in the first 30 minutes rank higher, Instagram's FAQ answers directly that this isn't true. It also says you should reply to comments within the first 7 days, which is a much wider window.

Reels beat photos in Feed. Instagram says Feed ranking "does not give preference to reels over photos." Reels reach non-followers through the Reels tab; in Feed, the format is matched to each viewer.

Scheduled posts get less reach. None of Instagram's published signal lists include the tool used to publish. A scheduled post is a normal post once it's live.

Editing a caption kills reach. Instagram hasn't published anything saying this, and edits aren't in any signal list. Treat it as unproven. If you want to know for your account, it's easy to test.

10 things that actually move Instagram ranking

Each of these maps to a signal or rule Instagram has published.

1. Post original work. Shoot your own photos and video, design your own carousels, and add real commentary to anything third-party. Result: you stay eligible for Explore, Reels and suggested posts.
2. Earn shares. Shares and reshares are a top prediction on Feed, Explore and Reels. Write posts people send to one specific friend: "the 3 questions to ask your contractor before they start" gets sent; "our team at work" doesn't.
3. Hold attention for 3 seconds, then to the end. Put the payoff or the question in the first frame. Cut every second that doesn't move the story. Keep reels under 3 minutes if you want them recommended.
4. Make things worth saving. Saves are a top Explore action. Checklists, price breakdowns and step-by-step carousels get saved. Our Instagram carousel guide has formats that work.
5. Reply to comments for a week. Instagram says to like or reply within the first 7 days. Ask a real question in the caption so replies turn into conversations.
6. Use Stories for your warmest followers. Stories rank by viewing, replies and closeness. A weekly question sticker keeps those signals alive.
7. Remove watermarks and borders. Export clean files. Don't reupload a video with another app's logo on it.
8. Upload at full resolution. Instagram names resolution in both the ranking explainer and the FAQ.
9. Write for Search. Put the words your customers type ("dog groomer Austin", "gluten free bakery") in your name field, bio, captions and up to 5 hashtags.
10. Collaborate. Instagram recommends Collabs posts, which show one post to both accounts' followers and can be recommended in Reels, Explore and Feed.

A 4-week test plan for your account

Instagram's published rules tell you what's possible. Only your own numbers tell you what your audience wants. Run one variable per week and keep everything else the same (posting time, number of posts, topic).

How to run it:

1. Before week 1, pick your posting time from your Insights (Instagram's advice is to post when your audience is active; our guide to the best times to post on social media explains how to read it).
2. Schedule all posts for the week in advance so the timing stays fixed. If you need a walkthrough, see how to schedule Instagram posts.
3. Record each post's numbers 7 days after publishing, not the same day. Instagram says distribution to non-followers can take time.
4. In week 3, use the trial toggle when you share a reel. Check the metrics after about 24 hours and share the winner with everyone.
5. At the end of week 4, keep whatever beat the baseline by a clear margin (20% or more on your main metric) and drop the rest.

How to read the results in Instagram Insights

Instagram's reach tips point to one view above all: in Insights, break down accounts reached by followers and non-followers, and track it over time by changing the date range.

Here's how to read what you see:

• High follower reach, low non-follower reach: your content serves your community but isn't getting recommended. Check originality, watermarks and length, then test hooks.
• Low follower reach, high non-follower reach: recommendations work, but your followers aren't engaging. Use Stories and replies to rebuild those relationships.
• Both low for several posts in a row: check Account Status before changing anything else.

A sample line from a week-4 report for a local business might read:

For a deeper method on building that report, see our social media analytics guide.

Check Account Status first

Instagram's own instructions: go to Settings, then Account, then Account Status. It shows whether your content is eligible to be recommended to non-followers (Explore, Reels, Feed recommendations), whether your account can appear in Search and Suggested Accounts, and any feature restrictions. You can delete the flagged content or request a review. Since October 2025 it also shows if your account is unavailable to teen users.

If Account Status is clean, you don't have a penalty. You have a content or audience question, which the test plan answers.

What nobody outside Meta knows

Be skeptical of anyone who gives you exact numbers for the Instagram algorithm. Instagram has published the signals and the most important predictions, in rough order. It has not published:

• The weights. Instagram says it ranks by how likely an action is and "how heavily we weigh that action." The weights aren't public and change over time. Instagram says it adds and removes signals and predictions over time.
• The thresholds. How many shares per view lift a reel into wider distribution, or how long an account stays ineligible after rule breaks ("a period of time"), aren't public.
• Your test cohort. Nobody outside Meta knows how many non-followers see a reel first, or how "audience matching" picks them.
• Search signals. Instagram hasn't published a Search ranking list in its current explainer.

What you can know is your own account's data, which beats any rule of thumb built on someone else's account.

How an AI planner uses your results instead of algorithm folklore

Everything above is a loop: post original work, measure per-view results, keep what works. The hard part is doing it every week for every client.

This is the loop SocialScheduler automates. Each Sunday the AI plans the week's Instagram posts in the client's voice, including image posts, carousels and vertical short videos with captions and voiceover, and publishes them at the hours that client's audience is online. It learns from each account's own results and from top posts in the niche (it never copies them), and it sends a Monday report under your agency's name. The agency or the client approves the plan, or you run it on full autopilot.

You can do the same by hand with a spreadsheet and the test plan above. If you'd rather schedule manually and keep your own notes, the Instagram scheduler in SocialScheduler's free plan covers 1 client and 3 accounts.

Start with Account Status today, then run week 1 as your baseline. After 4 weeks you'll have your own ranked list of what your audience shares, saves and watches to the end. That list is worth more than any algorithm hack.