Which fill mode is best for landscape to portrait?

To keep the whole picture without black bars, use Blurred background — the top and bottom are filled with a blurred, zoomed copy of the video, the look most short-video platforms use. Crop to fill makes the subject fill the screen but cuts off the sides. Solid color bars leave clean space for titles or captions.

Does upscaling make the video sharper?

No. Scaling 480p up to 1080p only adds pixels, not detail, and makes the file bigger. Upscale only to meet a platform's minimum resolution or to match other footage; to save space choose a lower resolution or the Small size quality.

Are my files uploaded to a server?

No. Everything runs locally in your browser via WebAssembly. Files never leave your computer and are discarded when you close the page.

Do I need to sign up or pay?

No. The site is completely free, requires no account, has no usage limits and adds no watermarks.

📐

📐Resize Video Online - Change Resolution and Aspect Ratio (9:16, 1:1, 4:5)

Want to post landscape footage to TikTok, YouTube Shorts or Instagram Reels without the sides getting chopped off? Choose a target aspect ratio (9:16, 1:1, 4:5, 16:9, 4:3, 3:4) and resolution (4K, 2K, 1080p, 720p, 480p, 360p or a custom width × height). When the ratio changes you decide how to fill the frame: a blurred, zoomed copy of the video as the background (the classic vertical-video look), solid color bars in any color, crop to fill, or stretch. A live preview shows the result as you adjust, and you can process several videos at once. Output is H.264 MP4, and AAC / MP3 audio is copied without re-encoding.

Free · No sign-up · Runs in your browserLast updated: 2026-10-26

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How to use Resize Video

1Upload one or more videos
2Pick a resolution and aspect ratio (or a custom size) and how to fill the frame
3Click Resize video and download the MP4

FAQ

Which fill mode is best for landscape to portrait?: To keep the whole picture without black bars, use Blurred background — the top and bottom are filled with a blurred, zoomed copy of the video, the look most short-video platforms use. Crop to fill makes the subject fill the screen but cuts off the sides. Solid color bars leave clean space for titles or captions.
Does upscaling make the video sharper?: No. Scaling 480p up to 1080p only adds pixels, not detail, and makes the file bigger. Upscale only to meet a platform's minimum resolution or to match other footage; to save space choose a lower resolution or the Small size quality.
Are my files uploaded to a server?: No. Everything runs locally in your browser via WebAssembly. Files never leave your computer and are discarded when you close the page.
Do I need to sign up or pay?: No. The site is completely free, requires no account, has no usage limits and adds no watermarks.