Change the resolution of a video
Pick a standard resolution or a custom height — the width is computed automatically so nothing gets distorted.
Your files never leave your device
How to change the resolution
- 1
Upload the video
Any source resolution.
- 2
Pick the new one
Standard presets or a custom height.
- 3
Download the MP4
With the aspect ratio intact.
Why use this tool
No distortion
The width is computed automatically — the image never stretches.
Useful presets
The sizes social networks, websites and phones ask for.
Less weight
Lowering resolution is the most effective way to lighten a video.
Private
The video never leaves your device: ffmpeg runs in your browser.
Frequently asked questions
Does upscaling improve the video?
No: upscaling interpolates pixels and creates no detail. It's only useful when a platform demands a specific minimum.
Which resolution should I pick?
720p balances weight and sharpness for sharing; 1080p for quality; 480p or less for messaging apps with hard limits.
Is the audio kept?
Yes, re-encoded to AAC 160 kbps — transparent to most ears.
Why does it take a while?
Rescaling means re-encoding every frame in your browser (single-threaded). The upside: total privacy.