About Video Resizer
Resolution is the biggest lever on how a video looks and how large it is. A 4K phone recording is wonderful on the phone that shot it and painful to send, upload or store, while a 480p copy is small enough for chat and usually indistinguishable on a screen that small. Resizing is the difference between a clip that gets shared and one that bounces from an attachment limit.
This tool gives you a target height, a maximum width, or both, and lets FFmpeg on the server re-encode the clip to fit. The aspect ratio is always kept and the frame is never enlarged: if you ask for 1080p from a 360p source, the original size is used rather than a blurry upscale. The result is a standard MP4 with H.264 video and AAC audio.
What this tool does
Height presets that matter
Choose 1080p, 720p, 480p or 360p and the width follows automatically, which covers most sharing and embedding situations.
A maximum width option
Portrait video, social crops and layout constraints are easier to hit with a pixel width; combine it with a height to fit inside a box.
No silent upscaling
A target larger than the source leaves the original resolution untouched. The tool only ever removes pixels, never invents them.
Aspect ratio preserved
No stretching or squashing: the frame is scaled proportionally, and the final dimensions are rounded to even numbers for H.264.
Source size shown first
When your browser can read the file, the workspace shows the original frame size so you know whether a target is a downscale before you start.
Automatic cleanup
The uploaded video and the resized copy are written to a temporary folder only and deleted automatically after the download.
How to use Video Resizer
- 01
Upload the video
Drop an MP4, MOV, MKV, WebM, AVI or another supported file into the workspace. Files up to 100 MB are accepted.
- 02
Choose a target height
Pick 1080p, 720p, 480p or 360p, or leave it on the original if you only want to limit the width.
- 03
Optionally cap the width
Add a maximum width when the video is portrait or needs to fit a specific layout. The aspect ratio stays intact.
- 04
Resize and download
Click Resize video, wait for the server re-encode, preview the result and download the MP4.
Supported formats and limits
- Input
- MP4MOVMKVWebMAVIM4VWMVMPEG3GP
- Output
- MP4
- Processing
- Server-side FFmpeg job in a temporary directory, deleted after download.
- Maximum size
- Up to 100 MB
- Requirements
- Chrome, Edge, Firefox or Safari · Server-side FFmpeg conversion
Limitations worth knowing
- Resizing re-encodes the video, so it is lossy and cannot add detail the source did not have.
- No cropping, padding or aspect-ratio changes: the whole frame is kept and scaled proportionally.
- HDR and Dolby Vision sources are converted to standard SDR color.
- Uploads are capped at 100 MB, one file per job, with a three-minute processing limit.
Privacy and file handling
The uploaded video is written to a temporary working directory on our server, resized with FFmpeg, and streamed back to your browser. Both the upload and the resized copy are deleted automatically when the download completes; nothing is stored long term or shared.
Read the full privacy policy