Resize & Crop
Social Video Resizer
One video, every feed. Reframe any clip for Reels, Shorts, TikTok or square posts without re-shooting anything.
Drop your video here
or click to browse. MP4, MOV, WebM, MKV and AVI work here
Processed 100% in your browser. Nothing is uploaded.
Your video is processed locally in your browser and is not uploaded to our servers. Processing starts only when you click the button - nothing happens until then.
How to Use Social Video Resizer
- 1.Upload your video - Drop a video file or click to browse - it never leaves your device.
- 2.Pick an aspect ratio - Choose 9:16 for Reels/Shorts, 1:1 for square feeds, 4:5 for portrait posts, or 16:9 for landscape.
- 3.Choose fill or blur - Crop-to-fill zooms and crops to fill the frame; blur-background keeps the whole video over a blurred backdrop.
- 4.Set quality and resize - Pick a quality preset, then process. Compare the output size and download your MP4.
Social Video Resizer Features
Frequently Asked Questions
What size will my 9:16 video be?
9:16 exports at 1080x1920, 1:1 at 1080x1080, 4:5 at 1080x1350 and 16:9 at 1920x1080 - the standard full-quality sizes for each platform.
What's the difference between crop-to-fill and blur-background?
Crop-to-fill zooms into your video and trims the edges so every pixel of the frame is filled - great for punchy vertical clips. Blur-background scales your whole video to fit and fills the empty space with a blurred copy of itself, so nothing gets cut off.
Will resizing reduce my video quality?
Re-encoding always involves some quality trade-off. Choose the High or Best quality preset to keep it minimal. Avoid upscaling a small source to a large preset - pick the preset closest to your source resolution.
Can I resize a video for TikTok, Reels and Shorts at once?
All three use the 9:16 vertical format, so one 9:16 export works for TikTok, Instagram Reels and YouTube Shorts.
Is my video uploaded anywhere?
No. The resize runs entirely in your browser using ffmpeg compiled to WebAssembly. Your video never leaves your device.
Does this download videos from YouTube or Instagram?
No - this tool resizes video files you already have. It cannot download videos from YouTube, Instagram, TikTok or Facebook.