About the Resize Video
High-resolution videos are larger and slower to send than most uses need. This tool scales a video down to a standard resolution such as 1080p, 720p or 480p, or to half or a quarter of its size, while keeping its shape, so a vertical phone video stays vertical. The new size is shown before you start. The result is an MP4 encoded at high quality. Resizing happens on your own device, with no upload and no watermark.
Updated October 2026
How to use the Resize Video
- 1Select a video.
- 2Choose the new size.
- 3Check the old and new resolution shown under the menu.
- 4Press Resize video and wait for it to finish.
- 5Preview and download the MP4.
Choosing a resolution
Match the resolution to where the video will be watched.
- 1080p: large screens and YouTube uploads
- 720p: phones, messaging and most websites
- 480p: email and slow connections
- 360p and 240p: tiny previews
Resolution versus file size
Halving the width and height leaves a quarter of the pixels, so the file can shrink by around 60 to 75% at the same quality. That's why going from 4K to 1080p is the quickest way to make a huge phone video manageable.
How it works without uploading
Your browser has a built-in video engine (WebCodecs) that phones and computers use to play and record video. This tool uses it through Mediabunny, an open-source media library, to read your file, change it and write a new one, all inside the page. Speed depends on your device: a recent phone or laptop handles a few minutes of HD video comfortably, while long 4K files take longer.
Vertical and square videos
For portrait videos, 720p means 720 pixels wide and 1280 tall. Square videos stay square. The menu only offers sizes smaller than your video.
Sharpness after resizing
Scaling down averages neighbouring pixels, so the smaller video usually looks clean and sharp on the screens it is meant for. Fine text in screen recordings may become hard to read below 720p, so check a frame with text before choosing 480p or smaller.
Resize, crop or compress?
Resize changes the number of pixels but keeps the whole picture. Crop cuts away part of the picture to change its shape. Compress keeps the size but stores it more efficiently. For the smallest file, combine resizing and compressing.
Phone and computer
Resizing re-encodes every frame, so it takes about as long as the video on a phone and less on a computer. After resizing, trim unwanted borders with Crop Video, and change the file type with the Video Converter.
Features
- 1080p to 240p, half or quarter size
- Keeps the shape (aspect ratio)
- Works for vertical videos too
- High-quality MP4 output
- Preview before download
- No upload
Frequently asked questions
What does 720p mean?
720 lines of pixels on the short side: 1280 × 720 for a landscape video and 720 × 1280 for a vertical one. The tool always applies the number to the short side.
Will resizing make my video smaller in MB?
Yes, usually a lot, because there are fewer pixels to store. For the smallest files, also use the Video Compressor.
Can I make a video bigger?
No. Enlarging can't add detail, so the tool only scales down.
Will it stretch my video?
No. Width and height change by the same factor, so the picture keeps its proportions.
Which browsers work best?
Chrome and Edge on computers and Android support the most video formats. Safari 16.4+ and recent Firefox work too, but some codecs, such as HEVC in Firefox, may not be supported there.
Is my video uploaded?
No. It is processed on your own device with your browser's built-in video engine, so private videos never leave your phone or computer.
Does resizing keep the sound?
Yes, the sound is copied unchanged.