Match platform dimensions
Scale a video to a target width and height for a website, presentation or social workflow.
About Social Video Resizer
Social Video Resizer prepares one MP4, WebM or MOV source for TikTok, Instagram Reels, YouTube Shorts, social feeds and landscape video. Easy mode lets you check only the output ratios you need and shows the compatible social platforms for each format. Custom mode lets you control output ratios, Fill/Fit/Blur framing, crop focus, safe-area preview, quality and audio.
Common use cases
Create smaller playback copies
Reduce resolution when full source dimensions are unnecessary.
Standardize clips before merging
Prepare several videos with compatible dimensions for downstream editing or assembly.
How it works
1
The browser reads the source video's pixel dimensions and aspect ratio.
2
You choose a preset or custom output size and the tool calculates the target frame dimensions.
3
Frames are scaled and re-encoded into a new video at the selected resolution.
Privacy & file handling
Video resizing runs in the browser
The supported resize workflow processes the video on the device rather than requiring an upload to Zavilo.
Limitations and important notes
- Upscaling increases pixel dimensions but does not recreate real detail missing from the source.
- Changing aspect ratio without preserving proportions can stretch or squash the image.
- Re-encoding can change visual quality and file size even when the main goal is dimensions.
Resize vs AI upscale
| Feature | Method | Use when |
|---|---|---|
| Resize Video | Conventional frame scaling | You need exact dimensions quickly |
| AI Video Upscaler | AI-assisted enlargement | You want higher-resolution output with detail-focused enhancement |
How to use Social Video Resizer
- 1
Choose an MP4, WebM or MOV video.
- 2
Use Easy mode to check the social aspect ratios you need, or switch to Custom for framing controls.
- 3
Select 9:16, 4:5, 1:1 and/or 16:9 and choose Auto, Fill, Fit or Blur Background.
- 4
Create the selected videos and download individual MP4 files or a ZIP.
Tips for better results
- 9:16 fits TikTok, Reels and Shorts.
- 4:5 is useful for portrait feed posts.
- Use Blur Background when a large crop would hide important source content.
- The safe-area overlay is a preview guide and is not burned into the export.
Frequently asked questions
Can I create several social sizes at once?
Yes. Selected ratios are rendered sequentially from the same source video.
What does Auto do?
Auto fills when source and target ratios are close and uses a blurred background when the ratio change is large.
Does Auto track people?
Not in this version. Auto is aspect-ratio aware. Custom Fill lets you choose the crop focus.
Which file formats can I use?
Check the file picker and tool description for the supported formats. Available formats can vary by tool.