Choose dimensions with the same aspect ratio as your intended layout: vertical for full-screen phone video, square for balanced feeds, or landscape for widescreen viewing. Resizing changes pixel dimensions; it does not automatically reframe the subject. Confirm the current requirements of the platform where you will publish before creating the final export.
Resize a video to exact dimensions
Enter the required width and height, process the file and review the new frame.
Dimensions and aspect ratio are connected
Resolution is the width and height in pixels. Aspect ratio describes the shape created by those numbers. Both 1080 × 1920 and 720 × 1280 are 9:16 vertical frames, even though one contains more pixels.
If a 16:9 landscape source is forced directly into a 9:16 frame without cropping or padding, people and objects can look narrow. Resizing is best when the source already has the target shape; use cropping when you need to recompose a different shape.
Upscaling a small source creates more pixels but cannot recreate missing detail. Choose a realistic output size and protect readable text rather than exporting an unnecessarily large file.
How to resize a video with Mediaivo
- Identify the destination shape
Decide whether the final presentation is vertical, square or landscape and confirm its current technical requirements.
- Check the source aspect ratio
Use matching proportions when possible so the image does not stretch.
- Enter width and height
Choose even pixel values and avoid enlarging far beyond the source resolution.
- Review the full frame
Check faces, captions, logos and edge content on a phone-sized preview before uploading.
Common canvas choices
These are common starting shapes rather than permanent platform rules; publishing services can change their specifications.
| Situation | Recommended choice | Check before publishing |
|---|---|---|
| Full-screen vertical video | 9:16, commonly 1080 × 1920 | Make sure captions and faces stay away from interface overlays. |
| Square feed asset | 1:1, commonly 1080 × 1080 | Check that the source can be cropped or framed without losing the subject. |
| Landscape video | 16:9, commonly 1920 × 1080 | Inspect small text if the source was lower resolution. |
How to keep a resized video looking sharp
Start with the cleanest source available and avoid enlarging it more than necessary. Downscaling usually looks cleaner than aggressive upscaling because the source already contains enough detail.
Text, interface recordings and thin lines reveal softness quickly. Preview the exported file at the actual display size, and confirm that nobody appears stretched or squeezed.
Common mistakes to avoid
1. Ignoring aspect ratio
In Mediaivo, different source and canvas ratios produce black padding. Use Crop Video first if filling the canvas matters more than retaining every edge.
2. Assuming resize means crop
Changing dimensions and changing composition are different operations.
3. Upscaling a low-resolution source
A larger output file cannot manufacture true detail that was never captured.
4. Placing important content at the edges
Platform controls and previews can cover or trim edge content.
Final check before downloading or publishing
- People and circles retain natural proportions.
- Captions remain readable at phone size.
- Important objects fit inside the new frame.
- No unintended bars or edge cuts appear.
- The destination accepts the output dimensions.
Frequently asked questions
What size should a vertical video be?
A 9:16 canvas such as 1080 × 1920 is a common starting point, but always confirm the current requirements of the platform you are using.
Why does my resized video look stretched?
Mediaivo preserves proportions and adds black padding. If a player still stretches the result, compare its display settings and source metadata; the width and height controls do not intentionally stretch the picture.
Will resizing make the file smaller?
Reducing pixel dimensions often lowers file size, but duration, codec, bitrate, frame rate and audio also matter.
Can resizing improve a blurry video?
Not usually. Upscaling changes dimensions but does not restore fine detail missing from the original.
Build the right frame for the destination
Choose width and height carefully, then check the composition at real viewing size.
A media-processing example you can repeat
Checked September 9, 2026 using Mediaivo's processing functions and ffmpeg version 6.1.1-3ubuntu5 Copyright (c) 2000-2023 the FFmpeg developers. The source is an original synthetic test chart, with no personal data or third-party footage. Video is silent and three seconds long.
Settings: Width: 360; Height: 640
Download input · Download reference output · Measurements and method
Run this example in the tool →
| Measurement | Input | Output |
|---|---|---|
| Bytes | 2334407 | 48220 |
| Pixels | 1280 × 720 | 360 × 640 |
| Video/image codec | h264 | h264 |
The complete 16:9 frame is fitted inside a 360 × 640 portrait canvas. Black bars are expected above and below; the image is not stretched.