About Resize Video
Change a video’s pixel dimensions. Downscale a 4K file to 1080p for faster sharing, upscale a 480p clip, or hit a specific resolution for an upload spec.
How resize video works
Resizing changes the resolution: the literal number of pixels in each frame. Downscaling (4K to 1080p, say) throws information away in a controlled way, producing smaller files that play smoother on weaker devices and slower networks. Upscaling (480p to 1080p) invents missing pixels. Useful when a platform requires a minimum resolution, but it doesn’t add detail that wasn’t there.
NextConvert uses high-quality scaling filters (Lanczos for downscales, bicubic for upscales) instead of the simple nearest-neighbour algorithm most browser tools default to. The difference is most visible on text, edges, and faces. Lanczos produces noticeably sharper output without the smeared look of cheaper resizers.
You can either keep the original aspect ratio (the default, where we calculate the second dimension automatically) or force an exact size. Forcing causes stretching or squashing, so most users keep aspect-locked.
When to use it
Fit upload limits
Drop 4K (3840 × 2160) to 1080p (1920 × 1080) and roughly quarter the file size.
Match platform specs
Hit Instagram Stories’ 1080 × 1920, YouTube Shorts’ 1080 × 1920, or LinkedIn’s 1200 × 627 cover dimensions exactly.
Reduce bandwidth
Serve 720p instead of 1080p from your website to halve bandwidth without users noticing on mobile.
Upscale legacy footage
Bring SD video up to HD dimensions so it doesn’t letterbox into a tiny window on modern displays.
Supported formats
Input
Output
Step-by-step guide
- 1
Upload the video
We display the current resolution so you can see what you’re starting from.
- 2
Pick a target
Preset (2160p, 1080p, 720p, 480p, 360p) or custom width × height. Toggle “lock aspect ratio” on or off.
- 3
Resize and download
We re-encode with the chosen scaler and produce the resized file. Audio passes through untouched.
Tips for the best result
- Downscaling beats upscaling every time. Start from the highest resolution you have and reduce, not the other way around.
- Heavy upscaling (for example 360p to 4K) won’t look good. Choose a one or two-step jump like 480p to 720p for the cleanest result.
- Pair resize with compress to chain both. It’s a single round-trip on our servers instead of two.
Privacy and security
Files are uploaded to our processing servers over an encrypted connection and removed automatically after the job completes (usually within a few hours). We never share your media or train models on it. You can also delete a job manually at any time from your dashboard.
Read our full privacy policy for retention timelines and our list of subprocessors.