Free Tool
Resize video to any resolution — 4K, 1080p, 720p, or custom
Scale video up or down in your browser. No upload, no account.
The problem
Social platforms have strict resolution requirements. TikTok wants 1080×1920, YouTube wants 1920×1080, Instagram feed wants square. Exporting from a video editor just to change resolution means re-importing and re-exporting the whole timeline.
The NSS solution
NSS Video Resizer scales your video to a preset or custom resolution using browser-native canvas rendering. Maintains aspect ratio by default, or stretch to exact dimensions. Download in minutes.
How to use it
- 1
Downscale 4K for faster web delivery
A 4K recording watched on a 1080p screen looks the same at 1080p — but the file is 60-80% smaller. Downscale before uploading to YouTube or your website.
- 2
Prepare for platform requirements
TikTok, Reels, and Shorts expect 1080×1920. YouTube Shorts and standard uploads expect 1920×1080. Resize to exactly what each platform needs.
- 3
Shrink for storage or email
Downscale a 1080p clip to 480p to get file sizes small enough for email or archiving.
Step-by-step guide
- 1
Choose a resolution preset
Pick from 4K, 1080p, 720p, 480p, 360p, 240p, or enter custom dimensions.
- 2
Toggle aspect ratio lock
With "Maintain aspect ratio" on, the video scales proportionally. Turn it off for exact dimensions.
- 3
Upload and download
The video plays through at real time while being rescaled. Download when complete.
Common questions
Can I upscale video with this tool?
Yes, but browser canvas upscaling uses bilinear interpolation which is less sharp than AI upscaling. For best results when upscaling, use the AI Video Upscaler.
Does the audio quality change?
Audio is passed through to the output. The audio bitrate depends on what the browser MediaRecorder allocates.
Ready to try it?
No account. No subscription. No images uploaded to any server.
Resize video free→