Vertical clip as long-form YouTube: 1920x1080 blur keeps 31.6% sharp
YouTube says use 16:9 to keep a video from becoming a Short. A 9:16 clip in 1920x1080 with blur fit keeps 608 px (31.6%) sharp; a 5-minute render is $0.50.
To post a vertical clip as a regular YouTube video, render it into a 1920x1080 frame with Timeline fit blur. The picture is scaled to 1080 px tall, which makes it 1080 x 9 / 16 = 607.5 px wide, about 31.6% of the 1920 px frame; the other 68.4% holds a blurred copy. YouTube's Shorts page (read 2026-10-09) says to avoid Shorts classification you should "use a wider aspect ratio such as 16:9 for long-form videos".
A Timeline render is $0.10 per output minute, rounded up, so a 5-minute video is $0.50 and a 7-minute video is ceil(7) = 7 x $0.10 = $0.70.
The geometry
Fit modes in the Timeline doc: cover (default) crops to fill, contain shrinks to fit and leaves the rest empty, stretch distorts, blur fits like contain and fills the empty area with a blurred copy. For a vertical source in a landscape frame, only contain and blur keep the whole picture.
| fit | Picture | Share of frame width | What fills the sides |
|---|---|---|---|
| cover | 1920 x 3413, cropped to 1920 x 1080 | 100% (a 1080 px slice of the picture) | nothing; 68.4% of the height is cut |
| contain | 608 x 1080 | 31.6% | empty bars |
| blur | 608 x 1080 sharp | 31.6% | blurred copy of the clip |
| stretch | 1920 x 1080 | 100% | nothing; the picture distorts |
Does blur look right
Blur fill is the common compromise: it keeps the full vertical frame, text included, and avoids flat bars. It is not a way to make a vertical video look native to 16:9. A viewer on a desktop sees a narrow strip. If you can, re-frame the shot: crop a 16:9 window from the middle of a high-resolution vertical source with video filter (a crop of height 0.5625 from the vertical frame yields a 16:9 window at the source width), then add the vertical version back in a picture-in-picture only if the content needs it.
The 16:9 window from a 1080x1920 source is 1080x607 (607.5 rounded to an even 608), well below 1920x1080, so it will look soft when scaled up. Blur fit has the sharper subject.
Bitrate and length
YouTube's encoding page (read 2026-10-09) lists 8 Mbps for 1080p at 24 to 30 fps, so five minutes is about 8 x 300 / 8 = 300 MB. A render of up to 1,800 seconds (30 minutes) is allowed in one Timeline call, and 200 video slots. Cost for a 30-minute render is 30 x $0.10 = $3.00.
Sume has no bitrate field and writes MP4; the file size is a function of the render. The recommendation to keep frame rate equal to what was recorded applies, so leave output.fps off unless a source needs conforming.
When to skip the blur
If the vertical clip is a talking head with space around the subject, a plain crop to a 16:9 window can look intentional, and cover does it without a second step. If the clip has captions or interface text near the top or bottom edge, a crop will cut them, and blur or contain is the safer choice.
Whichever fit you choose, run the free plan call first. It returns the same validation and the billable minutes without rendering, so a mistake in output size or slot timing costs nothing.
Sources
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