About this Resize Video tool
Every platform prefers a different shape: vertical 9:16 for Reels, TikTok and Shorts, 1:1 or 4:5 for Instagram posts, and 16:9 for YouTube.
Choose a preset or type your own size. If the shape changes, you decide whether to fit the video inside black bars, fill the frame and crop the edges, or stretch it.
How to use Resize Video
- Choose or drop the video.
- Pick a preset or type the width and height.
- Choose how to handle a different shape.
- Click Resize video and download the MP4.
Features
Social presets
Reels, TikTok, Shorts, Instagram, YouTube.
Fit, fill or stretch
Full control of the frame.
Keep proportions
Lock the aspect ratio.
Private
Nothing is uploaded.
Good to know
- Works in up-to-date Chrome, Edge, Firefox and Safari on computers and Android. iPhones with iOS 17 or newer work too.
- Files up to about 1 GB work well on most computers. Phones handle shorter clips best.
- Only edit videos you own or have permission to use.
Frequently asked questions
What size is best for Instagram Reels and TikTok?
1080×1920 pixels (9:16 vertical).
Will resizing make the file smaller?
Making the video smaller in pixels usually reduces the file size too. To shrink it further, use Compress Video.
Can I make a horizontal video vertical?
Yes. Choose 1080×1920 and Fill and crop edges, or Fit inside to keep the whole picture with bars.
Is my video uploaded?
No. The whole job runs inside your browser using your device's built-in video encoder, so the video never leaves your device.