Quick answer: The 9:16 aspect ratio means a frame that is 9 units wide for every 16 units tall, the standard shape of vertical video. Its most common resolution is 1080x1920 pixels, and Instagram Reels, YouTube Shorts and TikTok all work well with it. Keep key text away from the top and bottom edges, where interface buttons overlap.
Key facts
- A 9:16 frame has a width-to-height ratio of 0.5625, so 1080x1920, 720x1280 and 2160x3840 pixels all qualify.
- YouTube Help counts square or vertical videos up to three minutes as Shorts.
- Instagram's Help Center says Reels accept ratios from 1.91:1 to 9:16, with a minimum of 30 frames per second and 720 pixels.
- YouTube recommends about 8 Mbps for 1080p video at 24 to 30 fps, so a 45-second clip is roughly 45 MB of video.
- Cropping a 1920x1080 clip to 9:16 keeps only about 32% of its width.
- Publiqa renders vertical video at 1080x1920 and 30 fps.
What is the 9:16 aspect ratio?
An aspect ratio describes shape, not size. The 9:16 aspect ratio is a portrait frame: for every 9 units across, there are 16 units up. It is the 16:9 widescreen frame turned on its side, which is how a phone sits in your hand.
To find a matching pixel size, multiply the height by 9 and divide by 16. A 1920-pixel-tall frame is 1920 x 9 / 16 = 1080 pixels wide. That is why 1080x1920 is the default, and why a size like 1080x1900 is not true 9:16 even though it looks close.
Which resolutions fit 9:16?
Any width and height with the same ratio fits. These are the sizes you will meet most.
| Resolution | Pixels | Common name | Where you will see it |
|---|---|---|---|
| 540x960 | 518,400 | Low vertical | Minimum in some ad specifications |
| 720x1280 | 921,600 | HD vertical | Instagram's stated minimum is 720 pixels |
| 1080x1920 | 2,073,600 | Full HD vertical | The usual export size for Reels, Shorts and TikTok |
| 1440x2560 | 3,686,400 | QHD vertical | Phone footage and high-quality masters |
| 2160x3840 | 8,294,400 | 4K vertical | Source footage you will downscale |
What resolution is 9:16 for most uploads?
Use 1080x1920. It matches phone screens well, it is above every minimum we found, and platforms recompress feed video anyway, so uploading 4K rarely pays off. Shoot or render at higher resolution only if you plan to crop in later. That is the practical answer to what is 9:16 resolution for publishing.
Where is 9:16 used on social platforms?
People often add the word "official" to the search, as in youtube shorts aspect ratio 9:16 official, tiktok video aspect ratio 9:16 official or instagram stories aspect ratio 9:16 official. They want the platform's own statement, so this table cites each help page. It was last verified on 22 October 2026, so re-check before you rely on it.
| Platform | What the platform says | Source |
|---|---|---|
| YouTube Shorts | Square or vertical videos up to three minutes count as Shorts | YouTube Help |
| Instagram Reels | Ratios from 1.91:1 to 9:16; at least 30 fps and 720 pixels | Instagram Help Center |
| TikTok in-feed ads | 9:16 recommended, at least 540x960, up to 500 MB, 5 to 60 seconds | TikTok Ads Help (page may be dated) |
| Instagram Stories | Full-screen vertical is the native shape | Check Meta's current specs |
Note the wording. YouTube and Instagram describe what they accept, and neither says 9:16 is the only option. 9:16 is the recommended shape because it fills the screen. For a wider reference, see our cheat sheet on social media video sizes and our guide to Instagram post size.
Caption limits to check beside the video
Video is only part of a post. Publiqa's channel reference lists these text limits: X 280 characters, LinkedIn 3,000, Instagram 2,200 with the first 125 visible, Threads 500, Pinterest 100 for titles and 500 for descriptions. Reddit, YouTube, Facebook and Telegram limits are not in that reference, so check each platform before you publish.
Where do safe zones sit on a vertical video?
Platforms draw their interface over your video: profile names, descriptions, action buttons and progress bars. Text or logos placed under them get hidden or crowded.
No platform publishes one universal safe-zone number, and third-party guides give different margins. Our recommendation is a conservative rule for a 1080x1920 canvas that works across Reels, Shorts and TikTok.
| Edge | Keep clear | Why |
|---|---|---|
| Top | 250 px | Profile, search and sound labels |
| Bottom | 400 px | Captions, descriptions and progress bars |
| Right | 120 px | Like, comment and share buttons |
| Left | 60 px | Edge crop on some devices |
1080 x 1920 canvas (not to scale)
+--------------------------+
| top 250 px: keep clear |
| +--------------------+ |
| | | |
|60| SAFE AREA |120
| | 900 x 1270 px | |
| | | |
| +--------------------+ |
| bottom 400 px: keep clear|
+--------------------------+
The safe area comes to 900 x 1270 pixels, about 55% of the full frame. That sounds tight, and it is. Put your face, captions and logo inside it. Let backgrounds and motion run to the edges.
What export settings should you use?
Match the recommended settings from YouTube's upload guidance. They are a good baseline for any platform, and they are tuned for H.264 video in an MP4 container.
| Setting | Recommended value |
|---|---|
| Container | MP4 |
| Video codec | H.264, High Profile |
| Audio codec | AAC-LC, 48 kHz stereo |
| Frame rate | Match your source: 24, 25, 30, 48, 50 or 60 fps (Instagram asks for 30 fps minimum) |
| Bitrate, 1080p, 24 to 30 fps | 8 Mbps |
| Bitrate, 1080p, 48 to 60 fps | 12 Mbps |
| Bitrate, 720p | 5 Mbps |
| Audio bitrate, stereo | 384 kbps |
Here is the file-size math. At 8 Mbps, one second of video is about 1 MB, so a 45-second clip is roughly 45 MB plus about 2 MB of audio. A 60-second clip is close to 60 MB. If a platform rejects your upload for size, lower the bitrate before you lower the resolution.
How do you convert a 16:9 video to 9:16?
The math explains why this is hard. Take a 1920x1080 landscape clip and crop it to 9:16 at full height. The crop is 607.5 pixels wide, which is about 32% of the original width. Two-thirds of your picture is gone.
The alternative is to fit the whole clip inside a 1080-pixel-wide frame. It shrinks to about 607 pixels tall, so roughly 68% of the vertical canvas is empty bars.
| Method | Keeps | Loses | Use it when |
|---|---|---|---|
| Center crop | Full height, sharp picture | About 68% of the width | The subject stays in the middle |
| Subject-tracking reframe | The subject in each shot | Side context | One person or object moves around |
| Fit with blurred background | The whole frame | Size of the picture | You must show everything, such as a screen recording |
| Rebuild vertically | A layout made for 9:16 | Time | The video matters enough to justify a re-edit |
For a quick center crop with a free command-line tool:
ffmpeg -i input.mp4 -vf "crop=ih*9/16:ih,scale=1080:1920" -c:a copy output.mp4
For anything important, rebuild rather than reframe. A talking-head clip with graphics added on the sides will not survive a crop, and a layout designed for vertical will look better than a reframed one.
9:16 vs. 4:5 vs. 1:1 vs. 16:9: which should you use?
Pick the shape for the place it will be seen. Here are the common social media aspect ratios side by side.
| Ratio | Typical pixels | Best for |
|---|---|---|
| 9:16 | 1080x1920 | Reels, Shorts, TikTok, Stories |
| 4:5 | 1080x1350 | Instagram feed posts and carousels |
| 1:1 | 1080x1080 | Feed posts where square is acceptable |
| 16:9 | 1920x1080 | YouTube long-form and websites |
The 4:5 and 1:1 pixel sizes follow from the ratios, and they are common choices rather than platform rules. Publiqa's reference lists 9:16 for Reels, Shorts and TikTok, 16:9 for YouTube long-form, and 4:5 for Instagram carousels.
Your export checklist
Run through this before every upload.
- Canvas is 1080x1920, at your chosen frame rate.
- Captions and logo sit inside the 900 x 1270 safe area.
- Format is MP4, H.264, AAC audio.
- File size and length are within the platform's limits.
- You watched the final export on a phone, not only on a monitor.
How Publiqa helps with vertical video
Publiqa is an AI studio for social posts and vertical video: one idea goes in, content for 12 channels comes out. The AI video studio renders vertical video on a 1080x1920 canvas at 30 fps, with voiceover-first timing, word-by-word captions, stock footage matching and logo watermarks. Simple mode gives you three lengths: 30, 45 or 60 seconds.
Publiqa renders 1080x1920 at 30 fps, so you can check the frame against the safe-zone margins above. Campaign Studio adapts the same idea into versions for the other channels. Publiqa also lists 16:9 for YouTube long-form and 4:5 for Instagram carousels. For the wider product, see the Publiqa home page.
Direct posting to the networks is still being switched on gradually. Publiqa sends content through outgoing webhooks and headless CMS integrations, which are live, so you may upload the file yourself for now.
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FAQ
What is a 9:16 aspect ratio?
A 9:16 aspect ratio is a portrait frame that is 9 units wide for every 16 units tall. It is the shape of a phone screen held upright and the standard format for Reels, Shorts and TikTok. Common resolutions include 1080x1920 and 720x1280.
What resolution is 9:16?
Any size that keeps the 9:16 ratio, such as 540x960, 720x1280, 1080x1920, 1440x2560 or 2160x3840. For social uploads, 1080x1920 is the practical choice because it looks sharp on phones and stays well within file-size limits.
How do I convert a 16:9 video to 9:16?
Crop to the center, use a subject-tracking reframe, fit the clip over a blurred background, or rebuild the layout vertically. Cropping keeps only about 32% of a landscape frame's width, so rebuild when the video is important.
What size is 9:16 for TikTok in pixels?
Use 1080x1920 pixels. TikTok's in-feed ad specifications recommend 9:16 with a minimum of 540x960, though that page may be dated, so confirm in TikTok's current help center before you publish ads.