Online Video Resizer with No Installs for Any Social Layout
Resize MP4, MKV, WebM, and MOV videos online for free with Flixier and change the aspect ratio right in your browser. Keep your quality while you switch between 9:16, 1:1, 16:9, and 4:5 for any platform. When you're done, edit your clip in our full editor without switching tools.
Over 1 million creators use Flixier every day including brands like:
Change Video Sizes Instantly for Any Social Platform
Resize Clips Without Waiting
Resize your MP4 video right on your computer, alongside MKV, WebM, or MOV. Because your files never leave your device, you don’t have to wait for the upload. There are no file size limits, so you can change video dimensions instantly without any annoying caps.
Optimize Videos for Instagram
Make your videos fit perfectly on Instagram. You can switch your videos to a square 1:1 format for your feed or a vertical 9:16 shape to resize for Instagram Reels or Stories. Change sizes in seconds without losing your original video quality.
Turn Videos into TikToks
Turn any wide desktop video into a vertical clip for phone screens. It takes just one click to resize for TikTok and catch your viewers' attention. Your video stays crisp and sharp while you switch layouts to match your favorite app.
Continue Editing Online
Keep your video looking great while making it easier to share. You can compress video files, trim out mistakes, or add text. When you’re done resizing, you can click to continue editing your video inside Flixier without ever closing your browser.
Who this is for
Marketers
Change your landscape video ads into vertical or square clips for different platforms. Make sure your videos look clean and sharp on mobile screens.
See How It WorksEducators
Business Owners
Social Creators
Still have questions?
We got you!
How do I resize a video for free?
Open Flixier in your browser and pick a video from your device. Choose a new size preset like square or vertical, and our free tool changes the video size instantly right on your computer without any slow uploads.
Can I resize a video without losing quality?
Yes. Flixier changes your video dimensions and layout shapes while keeping your picture sharp and clear. Your video keeps its high quality whether you make it square, wide, or vertical.
What aspect ratios can I resize to?
You can resize your videos to all the most popular choices. Switch easily between vertical 9:16, square 1:1, widescreen 16:9, and portrait 4:5 layouts to fit any social platform perfectly.
Do I need to upload my video or install an app?
No. You do not need to install an app or wait for files to upload. The tool runs completely inside your browser and processes the file on your device, so your internet speed will not slow you down.
Can I edit my video after resizing?
Yes. After you finish changing the size, you can click to open your project in the full Flixier editor. You can trim clips, add text, adjust sound, or keep editing without leaving your browser.
