Video Resizer
Fit any clip to 9:16, 4:5, 1:1, 16:9, or a size you type in. Crop to fill, or keep the whole picture with bars.
This preview is the output frame — whatever is cut off here is cut off in the file.
- Source
- —
- Export
- —
- Length
- 0:00.0
- Format
- MP4
Much quicker than the clip is long. You can switch tabs while it works.
How it works
How to resize a video?
Open your video
Drag a file onto the box or pick one from your device. It is read straight off your disk, so there is no upload bar and no file-size ceiling.
Pick the shape and size
Choose 9:16, 4:5, 1:1, 16:9, the original shape, or type an exact width and height. The preview immediately becomes the output frame.
Choose crop or bars
"Crop to fill" fills the frame and cuts off the sides that do not fit. "Fit with bars" keeps the whole picture and pads the gap in black or white.
Resize and download
The file saves as "yourvideo-1080x1920.mp4". It encodes on your graphics hardware, so it is far quicker than the clip is long — and you can switch tabs while it works.
Spec sheet
Features
Platform shape presets
One tap sets 9:16 for Reels and TikTok, 4:5 for the Instagram feed, 1:1 for a square post, 16:9 for YouTube — or keep the shape the file came in.
Exact width and height
Pick Custom and type any pixel size from 16 to 7680 on a side. Useful when a platform wants a number the presets do not cover.
Crop to fill, or fit with bars
Fill the frame and cut the overflow, or keep the whole picture and pad the gap. Bars come in black or white.
1080p, 720p or 480p
The short edge is set to the resolution you pick, so a 9:16 export at 1080p is 1080 × 1920 — not a stretched 1080 × 1080.
Optional audio
Keep the soundtrack or strip it. The picture is untouched either way — handy for silent loops and clips headed under a new track.
MP4 download, no watermark
The resize saves as H.264 MP4 with AAC when audio is kept. Clean file, no logo, no signup — and nothing is uploaded while it works.
The sizes
Video sizes for each platform
Every one of these is a preset in the tool above. Platforms re-encode whatever you send them, so matching the shape matters far more than matching the pixels exactly — 1080 on the short edge is plenty for all of them.
| Shape | Size | Where it is used |
|---|---|---|
| 9:16 | 1080 × 1920 | Instagram Reels and Stories, TikTok, YouTube Shorts, Facebook Reels |
| 4:5 | 1080 × 1350 | Instagram and Facebook portrait feed posts — the tallest a feed post can be |
| 1:1 | 1080 × 1080 | Square feed posts, LinkedIn, X, and grids that must line up |
| 16:9 | 1920 × 1080 | YouTube, X, LinkedIn video, Facebook landscape |
Questions