Why Your 4x5 Videos Fail: 3 Secrets for 2026 Social Media Engagement

If you're producing video for Instagram, Facebook, or LinkedIn in 2026, the 4x5 aspect ratio is the format to know. It fills more vertical space than a square post but stays inside the feed without going full screen. This guide covers the exact 4x5 resolution specs, when to use it vs. other ratios, and how to produce 4x5 video without filming in portrait mode.

Bottom line: if someone asks for "1080x1350" or "1080 by 1350 video", they mean 4x5. The two terms are interchangeable.

A 4x5 aspect ratio is a near-square portrait format where the video's width is 4 units for every 5 units of height. Render it at the standard 4x5 resolution of 1080×1350 pixels and you get a portrait frame 25% taller than a square at the same width.

It's *not* the same as 9:16 (TikTok / Reels / Stories) or 1:1 (classic Instagram square). 9:16 is taller and meant for full-screen mobile experiences. 1:1 is the legacy Instagram format. 4:5 sits between them: taller than 1:1, and shorter than 9:16, which is built for full screen placements.

There's no single correct 4x5 resolution, because the format is a ratio. These are the sizes you'll actually use:

• 1080 × 1350: the standard. What Instagram, Facebook, and LinkedIn expect for feed video. Use this 90% of the time.
• 1440 × 1800: HD upscale. Good if you're producing for ads where higher fidelity matters.
• 2160 × 2700: 4K equivalent. Future-proof for archival; most platforms downsample anyway.
• 864 × 1080: small / draft. Avoid for production, useful for previews.

If your editor exports a slightly different resolution (e.g., 1080×1349) due to rounding, that's fine. Feed platforms accept a range of ratios, so one pixel of rounding does not matter.

Three reasons to use 4:5 for feed posts, each one checkable:

• More height at the same width. At 1080 pixels wide, a 4:5 frame is 1350 tall, against 1080 for a square and 608 for 16:9, so it fills more of a portrait phone screen than either.
• It fits inside a post. 9:16 is built for full screen placements such as Reels and Stories; a 4:5 frame leaves room around it for the caption and buttons in a feed.
• It is inside every major range. Instagram accepts reels from 1.91:1 to 9:16 and Facebook supports 16:9 to 9:16, so a 4:5 file uploads to both without being rejected.

If you're already producing 16:9 content, you have three paths to 4:5:

1. Reframe + crop: center your subject, crop to 1080×1350. Loses width.
2. Generative fill: let an AI model fill the additional vertical space using context from the surrounding pixels. Modern editors (Premiere, DaVinci, Descript) ship this.
3. Re-shoot in vertical: best quality, highest cost.

If the footage does not exist yet, you can generate it, but generate it portrait, not wide. A 9:16 clip cropped to 4:5 keeps about 70% of its frame; a 16:9 clip cropped to 4:5 keeps less than half of its width. The section below has the numbers, and what the AI video models can and cannot output.

A straight answer, because a lot of pages get this wrong: none of the 72 video models in Percify's playground offers 4:5, checked on 16 September 2026. Depending on the model they offer 16:9, 9:16, 1:1, and in 21 of them 3:4 as well. So the question is not "which tool renders 4:5", it is "which source ratio loses the least when you crop to 4:5". The arithmetic:

So for a feed post, pick a model that offers 3:4 and generate at that ratio; if it only offers 9:16 or 1:1, use 9:16, or 1:1 when the composition is centred. Then crop to 1080×1350 in your editor. For a still image rather than video, several image models in the playground offer 4:5 directly, including GPT Image 2.5, FLUX, Nano Banana Pro and Seedream 5 Pro. Ask for a centred, chest up subject in the prompt so the crop has nothing to chase. Every model in the playground is priced per clip in credits, and you can compare two models on the same prompt before spending on the longer render.

The one case where the framing is decided before generation is a talking-head clip made from a photo: Percify lip-syncs a face to audio (billed per second of video), and the output inherits the photo's framing. Use a portrait photo with the face in the upper half, and a 4:5 crop keeps everything that matters.

Open the video playground ↗ to see the models and what each costs per clip, or read how AI lip sync goes wrong and how to fix it before you generate a talking clip.

• Cropping a widescreen subject without reframing. You'll cut off heads, hands, and product details. Always reframe before cropping.
• Burning in captions outside the safe zone. Instagram lays its caption and buttons over the lower part of the video. Keep text in the middle 80% vertically.
• Mismatched cover frame. The first frame becomes the static thumbnail in feed. Pick a strong visual; don't let it auto-default to frame 0.
• Exporting at the wrong frame rate. 24 fps looks cinematic but stutters on aggressive scroll. 30 fps is the safe default for feed video.
• Forgetting LinkedIn captions. Default-mute means a captionless video gets ignored.

The 4x5 aspect ratio at 1080×1350 resolution is the portrait size for feed posts on Instagram, Facebook and LinkedIn, and every one of them accepts it as uploaded. Whether you crop existing footage or generate new footage with AI, the rule is the same: start from the ratio that loses the least.

If you generate footage with AI, generate it in 3:4 where the model offers it and crop to 1080×1350, which keeps 94% of the frame; from 9:16 the same crop keeps 70%.