Resize video online free — change resolution to custom width and height. Supports MP4, WebM and MOV. FFmpeg browser-based, no upload required.
Video Resizer is a free online tool that lets you change video resolution and aspect ratio. Apply standard presets like 1080p, 720p and 480p or social ratios (1:1, 9:16, 16:9) in one click, with an aspect-ratio lock that keeps the video from being distorted. It supports MP4 and WebM, and lowering the resolution also shrinks the file size for easier uploading and sharing. All processing happens in your browser, so no file is ever uploaded to a server.
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How to use Video Resize?
Upload your video file.
Select the desired resolution (1080p, 720p, 480p) or aspect ratio preset.
Keep aspect-ratio lock on so the video does not get stretched.
Check the output format (MP4, WebM) and quality.
Click convert and download the resized video.
Frequently asked questions about Video Resize
Does reducing video size lower the quality?
Lowering resolution reduces pixel count which may slightly decrease quality, but on smaller screens the difference is barely noticeable.
Are there presets for social media video sizes?
Yes, presets are available for Instagram (1:1), TikTok/Reels (9:16), YouTube (16:9) and other major platforms.
Can I lock the aspect ratio so the video doesn't get distorted?
Yes. With aspect-ratio lock on, entering just one dimension auto-calculates the other to match the ratio, so the video never stretches or squishes. Turn the lock off to set width and height independently.
Does lowering the resolution also reduce the file size?
Usually yes. Lowering resolution reduces the pixel count, so less data is encoded and the file gets smaller. Going from 1080p to 720p often roughly halves the size, which helps with uploading and sharing.
Are my uploaded videos stored on a server? Is it private?
No. All resizing is processed inside your browser, so no video is uploaded to or stored on a server. It even works offline, and the output stays only on your device, so personal videos remain private.
How to get the most out of Video Resize?
Upscaling above the original resolution doesn't add real detail and only inflates the file, so resizing down is usually the better choice.
For social uploads, keep aspect-ratio lock on and use the 9:16 (vertical) or 1:1 (square) presets to fit without cropping.
To shrink the file further, step the resolution down to 720p or 480p — on small screens the difference is barely visible.
When changing to a ratio different from the source, cropping or black bars can appear, so check the preview first.