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Vertical 9:16 with the longest runway of the three.
This AI Instagram Reels generator produces vertical 9:16 video with the longest runway of the three short-form platforms: up to ninety seconds, against sixty on YouTube Shorts and TikTok.
That extra thirty seconds changes what fits. A Reel can carry a genuine three-beat idea rather than a single line, which is why the same script often works better here than it does on the other two.
Everything about it assumes the first watch is muted and fast. Captions are burned in, the opening idea is written to survive with no audio at all, and the ending is built so a rewatch makes the first line land harder.
Sixty seconds forces a single idea. Ninety allows a setup, a turn and a payoff, which is a real structural difference rather than a marginal one.
The script is generated against the actual ceiling — the word count comes from Instagram's ninety seconds at normal speaking pace — so a Reel uses the runway it has instead of being written to the tightest common denominator.
Most Reels are met muted in a scrolling feed. If the idea only arrives through the voiceover, it does not arrive. So the opening is written as something that reads as on-screen text, and captions are burned in rather than left to the platform.
This is the single biggest difference between a Reel that performs and one that does not, and it is a writing decision more than a production one.
Instagram replays a Reel automatically, and a rewatch counts. An ending that returns to the premise — so the last line makes the first line land harder the second time — turns one view into two without asking anything of the viewer.
It is not a trick. It is writing an ending that closes the loop the opening opened, which the format happens to reward twice.
Instagram has no tags field, so hashtags carry the discovery, and the caption's first line is the only part visible before the more cut. Both are generated together by the caption tool, one step away from here.
A light prompt to comment or save measurably lifts reach on Instagram specifically, which is why the caption is written as a hook with an ask rather than as a description of the video.
A Reel reaches beyond your followers in a way a feed post does not, which makes it the discovery surface of an Instagram account rather than one more format on it. The follow usually happens after someone has seen two or three, so what matters is that they are recognisably from the same place.
That argues for consistency in the things a viewer registers in the first second — the caption style, the pacing, the way the opening frame looks — more than for variety. Generating from one script source helps here, because the voice stays the same across everything you publish without anyone maintaining a style guide.
The other half is the account itself. A Reel that performs sends people to a profile, and if the profile does not immediately say what they will get by following, the reach was spent for nothing.
● QUESTIONS
Generation here is capped at ninety seconds, the longest of the three vertical formats. The script's length is derived from that ceiling, so a generated Reel always fits.
Yes. Most Reels are watched muted on first view, so captions are part of the render rather than something added on the platform afterwards.
The 9:16 file works on both, though the writing conventions differ — TikTok rewards a more native, conversational register and a shorter caption. Generating separately for each usually performs better than cross-posting one file.
The Caption and Hashtags tool does, and it is one step away. Instagram has no tags field, so the hashtag set is the discovery signal and is worth generating properly.
Yes. The voiceover is synthesised and the footage is sourced or generated, so nothing requires a camera or an on-screen presence.
● OTHER FORMATS
Full-length 16:9, no time limit. Paste a whole script.
Vertical 9:16, under a minute, built for the Shorts shelf.
Vertical 9:16, native and fast — hook in the first beat.
Ideas, scripts, thumbnails, SEO and the rest of the pipeline