How to go viral on Instagram Reels: what Instagram says it rewards
Instagram says it shows fewer Reels that are watermarked, low resolution, muted or already posted, and in January 2025 it named watch time, likes and sends as the signals to watch. The ten checks below turn those statements into a pre-posting list.
By the Go Viral team at Monadly · Updated · First published · Editorial policy
What Instagram says gets a Reel recommended
Instagram said on 31 May 2023 that it shows 6 kinds of Reel less, and in January 2025 that watch time, likes and sends are the signals to track, so how to go viral on Instagram Reels comes down to avoiding the first and earning the second from the people who see the Reel. The 2023 list is low resolution, watermarked, muted, bordered, mostly text, or already posted on Instagram.
The 2025 advice came from Adam Mosseri in a video: track watch time, likes per reach and sends per reach, with sends weighted slightly toward viewers who do not follow you. Reposters face a third date. From 30 April 2026, an account that keeps reposting others’ material, photos and carousels too, loses recommendation eligibility unless it meaningfully transforms what it posts. The 10 checks below come from those statements.
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What has Instagram said it ranks Reels on?
Instagram says it ranks Reels on four groups of information, roughly in order of importance: what the viewer has done, the viewer’s history with the poster, the Reel itself, and the poster. Each statement below is dated.
31 May 2023, the factors. In the Instagram Ranking Explained post, Mosseri put the viewer’s activity first, then the viewer’s history of interacting with the person who posted, then information about the Reel such as its audio and visuals, then information about the person who posted.
31 May 2023, the formats shown less. The same post lists six kinds of Reel that Instagram makes less visible: low resolution, watermarked, muted, framed by borders, made up mostly of text, or already posted on Instagram. You can check all six before you upload.
10 December 2024, trial reels. Instagram added a Trial toggle that keeps a Reel out of followers’ Feed and Reels tab until you share it to everyone. Its metrics arrive about 24 hours later.
January 2025, three numbers. Social Media Today reported a Mosseri video that gave creators three numbers: watch time, likes per reach, sends per reach. The audiences split them. For followers, likes matter slightly more; for non-followers, sends do.
2024, widened on 30 April 2026, originality. Since 2024 Instagram has swapped reposts for the original in recommendations and limited aggregator accounts. On 30 April 2026, TechCrunch reported, it widened to any account that regularly reposts others’ work, photos and carousels counted alongside video; the exception is material that is meaningfully transformed.
What should you check before posting a Reel?
Check ten things before you share, each tied to one of the statements above; the statement sits in brackets after each item.
Export a clean file. Upload the copy your editor exported, with no other app’s logo on it. If the clip came out of another short-video app carrying its mark, export again. The TikTok, Reels and Shorts comparison covers the other changes to make when the same clip also runs on TikTok and YouTube. (31 May 2023: watermarked)
Upload at full resolution. Check the export setting, then play the file full screen on a phone; soft edges and blocky gradients show up there first. (31 May 2023: low resolution)
Keep the sound on. Use original audio, a voice-over or a track, at a level you can hear on phone speakers. A muted Reel is on the shown-less list. (31 May 2023: muted)
Fill the frame. Horizontal footage dropped into a vertical frame leaves bars above and below. Crop or reframe until the picture reaches every edge. (31 May 2023: borders)
Let text support the video. A label on a step or the first line on screen is fine. A slide that is mostly words is the majority-text case; put the paragraph in the caption instead. (31 May 2023: majority text)
Shoot it yourself, or transform what you borrow. The sources here set no minimum for “meaningfully transformed”, so add something a viewer would notice: your voice-over, your cut, your verdict on what the clip shows. (2024 and 30 April 2026: originality)
Open on the reason to stay. Put the result, a problem or a claim in the first shot and cut the greeting in front of it. An example line: “This sauce has three ingredients and one of them is water.” (January 2025: watch time)
Give one reason to send it to one person. Picture who gets it in a DM: the flatmate who always burns the rice, the colleague booking the same trip. Write the Reel for that send. (January 2025: sends per reach)
Make it work for a stranger. A non-follower has no history of interacting with you, the second factor on Instagram’s list, so cut inside jokes, series references and “as I said last week”. (31 May 2023: history with the poster)
Trial the risky opening first. Share that cut with the Trial toggle on, read it after about 24 hours, and share it to everyone if it held up. The guide to running a trial reel sets up a test of two openings against each other. (10 December 2024: trial reels)
Run all ten every time. Items 1 to 6 are pass or fail on the file. Items 7 to 10 are judgment calls, and the scorecard below is how you check those calls after the Reel has been out for a few days.
How long can an Instagram Reel be, and what are the size requirements?
An Instagram Reel can run up to 3 minutes. Adam Mosseri announced the change from 90 seconds on 20 and 21 January 2025, alongside a profile grid that shows taller, rectangular thumbnails, so the first frame now has to read as a vertical cover too.
The longest allowed length is rarely the right one. Every extra stretch is another place for watch time, the first signal on Instagram's 2025 list, to fall; the Reels ideas page keeps most formats between 15 and 45 seconds. Beyond length, the requirements Instagram has published are the shown-less list behind items 1 to 6 above: no watermark, full resolution, sound on, no borders, not mostly text, not a repost.
The file specs come from Instagram's help page on Reel size: an aspect ratio anywhere between 1.91:1 and 9:16, at least 30 frames per second and at least 720 pixels of resolution. Vertical 9:16 is the shape that fills a phone screen, which is what item 4 asks for. The recommended cover is 420 by 654 pixels, a 1:1.55 ratio, and the cover cannot be changed after upload, so pick the frame on the posting screen. Instagram also offers Upload at highest quality under Media quality in settings; uploads take longer with it on.
How do you score a Reel per 100 reach?
The scorecard example on this page. B is liked slightly more by the people who saw it (7.0 against 6.2 per 100 reach), but A is sent 2.4 times per 100 reach against 1.0. Sends weigh slightly more with non-followers, Mosseri said in January 2025, so A is the format to repeat for reach.
Divide likes and sends by accounts reached and multiply each by 100. A rate lets a Reel seen by 3,000 accounts sit next to one seen by 2,500, which raw counts cannot do.
Two Reels from the same account, read from each Reel’s insights:
Reach per 100 scorecard: two worked Reels and a blank column to fill in
Line
Where it comes from
Reel A
Reel B
Your Reel
Accounts reached
The Reel’s insights
3,000
2,500
____
Likes
The Reel’s insights
186
175
____
Sends
The Reel’s insights
72
25
____
Likes per 100 reach
Likes ÷ accounts reached × 100
6.2
7.0
____
Sends per 100 reach
Sends ÷ accounts reached × 100
2.4
1.0
____
Format to repeat for reach
The higher sends rate of the pair
Yes
No
____
Reel B is liked more by the people who saw it: 7.0 likes per 100 against 6.2. Reel A is sent more: 2.4 against 1.0, which is 2.4 times the rate. Mosseri said sends weigh slightly more for non-followers, and non-followers are the audience beyond your own. Repeat Reel A’s format.
Raw counts mislead in both directions. On likes, A looks ahead, 186 to 175, though B earned more per 100 accounts from 500 fewer of them. On sends, raw counts put A 2.88 times ahead (72 ÷ 25); per 100 reach the gap is 2.4 times. Copy the last column for each new Reel and compare it with your own recent rows.
If both rates fall across several Reels in a row, the cause may sit outside the file. The guide to Reels not getting views works through the causes that sit at the account level instead.
Go Viral checks the opening before you spend a trial reel
Go Viral works on the video file, before Instagram has shown it to anyone. Bring in the export or a Reels link, and the Hook Score rates the opening 3 seconds from 0 to 100: the part of the Reel that has to earn the watch time in check 7.
With two cuts of the same Reel, run both through the View Forecast, which estimates potential reach, and spend the trial reel on the cut that comes out ahead. Then trial it. The app has no Instagram login, so accounts reached, likes and sends still come from the Reel’s insights.
Questions about going viral on Reels
How do you go viral on Instagram Reels?
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Post a Reel that avoids the formats Instagram shows less (low resolution, watermarks, muted audio, borders, mostly text, reposts) and earns watch time, likes and sends from whoever sees it. Those are the statements Instagram made on 31 May 2023 and in January 2025. Run the ten checks above before sharing, then score likes and sends per 100 accounts reached.
Can you go viral on Instagram with no followers?
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A Reel from an account with no followers can still be recommended, because Instagram recommends Reels to people who do not follow the poster. Every viewer of a new account is a non-follower, the audience where Mosseri said in January 2025 that sends weigh slightly more. Build each Reel around a reason to forward it, and expect a slower start, since information about the poster is a ranking factor.
Do hashtags help Reels go viral?
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Hashtags are not among the signals Instagram names in the sources cited here. The 31 May 2023 post lists the viewer’s activity, their history with the poster, information about the Reel and information about the poster; the January 2025 numbers are watch time, likes per reach and sends per reach. Put the effort into the opening and the reason to send.
How long should an Instagram Reel be?
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Instagram’s cited posts give no ideal length. Watch time is the signal Mosseri named in January 2025, so the length is whatever the Reel can hold. Cut every second a first-time viewer would skip and stop when the payoff lands. A 20-second Reel watched to the end gives 20 seconds of watch time; a 60-second Reel dropped at second 8 gives 8.
Check the opening before the Reel goes out
Paste a Reels link or import the file. Go Viral scores the opening 3 seconds from 0 to 100 and estimates potential reach for each cut, before you spend a trial reel. Free to download; a subscription is required to use all features.