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For a full-screen Instagram Reel, work on a 9:16 vertical canvas. A 1080×1920 project is a practical production choice, not a universal Instagram maximum. Export in a format accepted by the publishing route you will use, then check that route’s own duration, bitrate, resolution, and file-size limits before uploading.
The settings to use at a glance
Most creators should design a Reel as vertical 9:16 video and export a conventional 1080×1920 master. Keep important text, faces, and controls away from the areas covered by Instagram’s interface, and inspect the in-app preview rather than relying on a fixed “safe-zone” percentage. No single official percentage is established across every Instagram surface.
The important qualification is that Instagram does not use one specification for every workflow. In-app posting, publishing through Meta’s Instagram Graph API, and advertising can have different limits. A file that works in one route can fail in another even when the picture looks identical.
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Instagram’s limits are attached to a publishing surface, not simply to the word “Reel.” The app may accept a broader range of files than an automated API workflow, while advertising placements can impose their own requirements. Clapr’s comparison dated September 23, 2026 summarizes the issue plainly: “Instagram does not publish one set of Reels specs.”
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That is why a guide that gives one maximum duration or one file-size ceiling without naming the route can be misleading. Use the table below as a route-labeled reference, and confirm any requirement in the upload screen or the documentation for the tool you are using.
App, API, and advertising limits compared
| Publishing route | Aspect ratio guidance | Resolution guidance | File size | Duration | Container and codec | Frame rate | Bitrate |
|---|---|---|---|---|---|---|---|
| Instagram app posting | Help-center guidance summarized by Clapr allows approximately 1.91:1 through 9:16. | 720-pixel minimum in the same app guidance; no universal 1080×1920 maximum is established. | Not stated in the cited app guidance. | Up to 20 minutes in the Clapr summary dated September 23, 2026. | Not stated in the cited app guidance. | Not stated in the cited app guidance. | Not stated in the cited app guidance. |
| Instagram Graph API publishing | 9:16 is the recommended aspect ratio in Meta’s Instagram API documentation. | The documentation lists a 1,920-pixel maximum; its wording describes this as “horizontal pixels.” A June 24, 2025 Cloud Campaign summary describes a 1,920-pixel vertical maximum. Treat 1,920 pixels as the route’s maximum dimension and verify how your API wrapper labels width and height. | 1 GB maximum. | 3 seconds minimum; 15 minutes maximum. | MOV or MP4 container; H.264 or HEVC video; AAC audio at 48 kHz. | 23–60 FPS. | 25 Mbps maximum video bitrate; 128 kbps audio bitrate. |
| Instagram advertising | Ad specifications can differ from both app and API posting. | Not established by the figures cited here. | Not established by the figures cited here. | Not established by the figures cited here. | Not established by the figures cited here. | Not established by the figures cited here. | Not established by the figures cited here. |
The API row is the most precise set of technical limits available in the supplied Meta documentation. The app and advertising rows deliberately identify what is not established rather than turning a route-specific number into a platform-wide rule.
What resolution should an Instagram Reel be?
Use 1080×1920 as a working canvas
Set your editing project to 1080 pixels wide by 1920 pixels high when you want a conventional, full-screen vertical master. This gives you the familiar 9:16 shape used by modern phones and leaves a straightforward file for editing, captioning, and delivery.
Do not describe 1080×1920 as Instagram’s universal maximum or as a guarantee that every upload surface will preserve that exact file. The API documentation’s 1,920-pixel ceiling and the app’s separate 720-pixel minimum are route-specific evidence, not a single global “official Reel resolution.”
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What the pixel dimensions actually mean
The first number is the width and the second is the height. A 1080×1920 file is therefore portrait, not landscape. If your editor asks for “horizontal” and “vertical” or “width” and “height,” enter 1080 for width and 1920 for height.
The API documentation’s phrase “maximum 1920 horizontal pixels” does not align neatly with the way a portrait editor labels its dimensions. Cloud Campaign’s June 24, 2025 summary calls the ceiling vertical instead. Because of that wording difference, check the API tool’s own width-and-height validation instead of assuming that rotating the numbers will be accepted.
When a smaller file is sensible
A smaller export can be useful when your source footage is low resolution, your connection is slow, or the publishing tool rejects a larger encode. Upscaling a small original to 1080×1920 cannot recreate detail that was never captured. Preserve the source’s quality, keep the portrait composition, and stay within the route limits rather than enlarging footage solely to reach a number.
What is the best aspect ratio?
9:16 is the recommended ratio for a standard, full-screen Reel in Meta’s API documentation. It fills a portrait phone display and avoids the side or top-and-bottom space that appears when a video is delivered in a wider shape.
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The app guidance summarized by Clapr covers a broader range, from approximately 1.91:1 through 9:16. That range explains why some non-vertical uploads may be accepted in the app, but acceptance is not the same as a full-screen presentation. If your goal is a normal immersive Reel, compose at 9:16 from the beginning.
Design for overlays without relying on a fixed percentage
- Preview the finished file in Instagram before publishing.
- Keep subtitles, logos, prices, and calls to action clear of the top and bottom interface areas.
- Leave breathing room at the sides so a crop or device preview does not cut off letters.
- Check both the profile-grid preview and the full-screen preview when those options are shown.
The available sources do not establish one universal, official top-and-bottom safe-zone measurement. Treat overlay placement as a visual check that can change with the interface, account type, and placement.
How large can an Instagram Reel file be?
For the Instagram Graph API route, Meta’s documentation lists a 1 GB maximum file size. Cloud Campaign’s June 24, 2025 media-guidelines summary reports the same ceiling. That limit belongs to the API publishing workflow; it should not be presented as the confirmed limit for every in-app or advertising upload.
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If your upload is rejected for size, reduce unnecessary bitrate or shorten the edit before changing the aspect ratio. Re-encoding a 9:16 file with a supported codec normally addresses size more directly than squeezing the picture into a nonstandard frame.
API-compatible export settings
| Setting | Value for the documented API route | Practical interpretation |
|---|---|---|
| Canvas | 9:16 recommended | Use a portrait project; 1080×1920 is a conventional working size. |
| Container | MP4 or MOV | Choose the option your encoder produces reliably and your publishing tool accepts. |
| Video codec | H.264 or HEVC | Do not substitute an unsupported editing codec at delivery time. |
| Audio | AAC, 48 kHz | Export audio as AAC at the documented sample rate. |
| Frame rate | 23–60 FPS | Keep the export inside this range for API validation. |
| Video bitrate | 25 Mbps maximum | Use a lower value when the file is unnecessarily large. |
| Audio bitrate | 128 kbps | Match the documented API setting rather than leaving an extreme default. |
| Duration | 3 seconds minimum; 15 minutes maximum | These bounds apply to the API route, not automatically to app or ad uploads. |
| File size | 1 GB maximum | Validate the final encoded file, not the project folder or source media. |
Step-by-step: export a Reel that is less likely to be rejected
- Create a portrait sequence. Set the project to a 9:16 frame. If you need a standard full-screen master, choose 1080×1920.
- Reframe landscape footage. Crop or reposition the source so faces and text remain visible instead of allowing the editor to add accidental black bars.
- Set the delivery format. Choose MP4 or MOV, then select H.264 or HEVC for video and AAC for audio.
- Set audio sampling. Use 48 kHz AAC audio for an API delivery.
- Choose a supported frame rate. Keep the export between 23 and 60 FPS for the API route. Match the source where practical to avoid unnecessary motion conversion.
- Control bitrate. Keep video at or below 25 Mbps and audio at 128 kbps for the documented API workflow.
- Check duration and file size. Confirm the encoded file meets the API’s 3-second minimum, 15-minute maximum, and 1 GB ceiling, or check the separate limits shown by your app or ad uploader.
- Watch the preview. Look for cropped captions, covered buttons, unreadable small type, audio drift, and black bars before you publish.
- Upload through the intended route. Do not assume that a successful app upload proves the same file will pass API validation, or vice versa.
Why Instagram may reject a Reel
The file is outside a route’s duration limit
API publishing rejects files shorter than the documented minimum or longer than its documented maximum. App guidance summarized in 2026 allows a different upper limit. Check which uploader you are using and trim the edit for that route rather than relying on a generic Reel limit.
The dimensions or orientation are wrong
A landscape sequence, an unintended square export, or a width-and-height reversal can trigger validation or produce an awkward crop. Reopen the final file’s properties and confirm that width is smaller than height for a portrait Reel. If an API tool reports a 1,920-pixel violation, inspect whether it is validating width, height, or the longest dimension; the documentation’s wording has been summarized differently by Meta and Cloud Campaign.
The codec, container, or audio settings are unsupported
For the API route, re-export as MP4 or MOV with H.264 or HEVC video and AAC audio at 48 kHz. An editing project can contain formats that play locally but are not accepted by a publishing endpoint.
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The frame rate or bitrate is too high
An API rejection can result when frame rate exceeds the documented range or when video bitrate is above the stated ceiling. Inspect the delivery file in your editor or a media-information utility, then export again with compliant settings.
The file is too large
Check the size of the final encoded file. If it exceeds the route’s ceiling, reduce bitrate, remove unnecessary duration, or use a more efficient supported codec. Do not solve a size problem by damaging legibility with an extreme crop.
The preview looks acceptable but the posted Reel is cropped
This is usually a composition or overlay issue rather than a file-size failure. Return to the 9:16 timeline, move critical elements inward, and review the actual Instagram preview. Because interface overlays can change, a fixed percentage copied from an old template is not a reliable platform-wide guarantee.
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A practical decision checklist
- Publishing in the app: use 9:16 for a full-screen result, then follow the limits shown by the current app. The 2026 comparison cites a 720-pixel minimum and up to 20 minutes, but does not establish a universal app file-size or codec rule.
- Publishing through the API: follow the documented table values exactly, including the 23–60 FPS range, bitrate ceilings, supported codecs, duration bounds, and 1 GB maximum.
- Creating an ad: obtain the specification for the particular advertising placement. Do not substitute app or API numbers when the ad workflow supplies different requirements.
- Delivering to several routes: keep a clean 9:16 master, make route-specific encodes when necessary, and validate each final file separately.
Bottom line for creators
Build the Reel vertically at 9:16 and use 1080×1920 as a practical working canvas when your source supports it. The exact acceptance rules depend on whether you post in the app, publish through the Instagram Graph API, or deliver an ad. For the documented API route, use the listed container, codec, audio, frame-rate, bitrate, duration, resolution, and 1 GB limits; for other routes, verify the current route-specific guidance instead of treating one number as universal.
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