Video Tool · Free

Resize Video Online - Free

Change the resolution or aspect ratio of your video for any platform.

Free to startIn your browserUp to 500 MB
How it works

Resize Video in 3 steps

1

Upload your video

Drag and drop a video file, or click to browse.

2

Pick a size

Choose a preset resolution or enter a custom width and height.

3

Resize & download

Sign up to download the resized video, or keep editing in REQO.

Common video sizes, and when to use them

The honest rule: downscaling keeps video sharp, upscaling cannot invent detail. Resize down to hit a file-size or platform limit; avoid resizing up unless a platform forces a minimum resolution.

SizeResolutionBest for
4K (2160p)3840 x 2160Archiving, TV screens, heavy post-editing
Full HD (1080p)1920 x 1080YouTube, websites, presentations - the default
HD (720p)1280 x 720Email, Slack, smaller files with good quality
SD (480p)854 x 480Slow connections, previews, drafts
Vertical1080 x 1920TikTok, Reels, Shorts, Stories
Square1080 x 1080Instagram, X and LinkedIn feed posts

Resize or crop?

Resizing scales the whole frame, nothing is cut off. If you need a different SHAPE (landscape to vertical, widescreen to square), that is a crop: the frame edges have to go somewhere. For a platform switch you usually crop first to the target aspect ratio, then resize to the exact pixel size.

FAQ

Questions about resize video

Can I keep the aspect ratio?

Yes. Leave one dimension blank and we’ll scale the other proportionally so nothing is stretched.

What resolutions are supported?

Anything from 480p up to 4K, plus social presets for square (1:1) and vertical (9:16) video.

Is resizing free?

Yes - resize and preview for free; create a free account to download.

How do I change a video from horizontal to vertical?

That is a crop, not a resize: crop to 9:16 to change the shape of the frame, then resize to 1080 x 1920 if you also need a specific resolution. Our crop tool has the 9:16 preset built in.

Does resizing a video reduce quality?

Downscaling (say 4K to 1080p) keeps video looking sharp and cuts file size. Upscaling cannot invent detail: a 480p video resized to 1080p will look soft.

What size should a video be for Instagram?

1080 x 1920 for Reels and Stories, 1080 x 1350 for portrait feed posts, and 1080 x 1080 for squares.

Need to do more than resize video?

REQO is a full browser video editor, record, edit by transcript, and export.