Resize videos or change aspect ratio for any platform.
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A video resizer changes the pixel dimensions of a video, and an aspect-ratio changer adjusts the width-to-height proportions to fit a specific platform — for example, converting a widescreen 16:9 video into a vertical 9:16 clip for Instagram Reels or YouTube Shorts.
This tool offers ready-made presets for the most common social formats: 16:9 landscape for YouTube and traditional video, 9:16 vertical for Reels, Shorts and TikTok, 1:1 square for feed posts, and 4:5 portrait for Instagram's recommended feed ratio.
When you choose a target size, the tool scales your video to fit within the new dimensions while preserving the original aspect ratio, then adds padding (black bars) to fill any remaining space rather than stretching or distorting your footage. This keeps people and objects in your video looking natural, instead of squashed or stretched.
This is especially handy when repurposing the same footage across multiple platforms — record once in landscape, then generate square and vertical versions for different social feeds without needing separate editing software.
If you'd prefer your video to fill the entire frame with no padding (cropping instead of padding), you can crop the source footage first using your device's native video editor to roughly the right proportions, then use this tool to finalize the exact pixel dimensions.
Different platforms enforce different recommended (and sometimes required) aspect ratios: YouTube prefers 16:9 for standard uploads, Instagram Reels and TikTok are built around 9:16 vertical video, and Instagram's main feed traditionally favors 4:5 portrait for maximum screen real estate in the app.
Padding rather than cropping is the safer default because it guarantees nothing important in your original frame is cut off. If you know your subject is centered and some cropping is acceptable, you can often get a more immersive full-frame result by cropping the source video first in a basic editor before running it through this resizer.
Beyond social media, this tool is also useful for preparing video assets for website headers, email newsletter thumbnails, or presentation slides that expect a specific aspect ratio. Rather than manually calculating pixel dimensions and padding in a desktop editor, picking the matching preset here gets you a correctly proportioned file in a single step.
When in doubt about which preset to choose, check the destination platform's current recommended dimensions directly, since social platforms occasionally update their preferred sizes; the four presets offered here reflect the most common and stable proportions used across major platforms as of today.
As short-form vertical video continues to dominate social feeds, having a fast way to reformat existing landscape footage into 9:16 without re-shooting is one of the most commonly requested video tasks among casual creators and small businesses alike.
In short, this tool turns a single piece of footage into several platform-ready versions without needing separate editing software for each target size.
Try it the next time the same footage needs to work across several different apps at once.
Padding keeps your subject fully visible no matter which target ratio you choose.
No, by default we preserve the original aspect ratio and add padding rather than stretching your footage out of shape.
Use the 9:16 Vertical preset (1080x1920), which is the standard size for Reels, Shorts and TikTok.
The current version offers curated presets for the most common social media sizes; a custom-size option is on our roadmap.
Resizing to a smaller resolution reduces file size and detail slightly, similar to any resizing operation, but the tool uses high-quality scaling to minimize visible loss.