# Resize Video Online - Change Resolution and Aspect Ratio (9:16, 1:1, 4:5)

> Free online video resizer: change resolution to 1080p, 720p, 480p or a custom size, and convert to 9:16, 1:1 or 16:9 with blurred bars, colour bars or crop.

- URL: https://qilingtools.com/en/video/resize
- Category: Video Tools (https://qilingtools.com/en/video)
- Tags: [Video](https://qilingtools.com/en/tags/video), [Converters](https://qilingtools.com/en/tags/convert), [Social Media](https://qilingtools.com/en/tags/social)
- Last updated: 2026-10-26
- Price: Free, no sign-up
- Privacy: Runs locally in the browser; files are never uploaded

Want to post landscape footage to TikTok, YouTube Shorts or Instagram Reels without the sides getting chopped off? Choose a target aspect ratio (9:16, 1:1, 4:5, 16:9, 4:3, 3:4) and resolution (4K, 2K, 1080p, 720p, 480p, 360p or a custom width × height). When the ratio changes you decide how to fill the frame: a blurred, zoomed copy of the video as the background (the classic vertical-video look), solid color bars in any color, crop to fill, or stretch. A live preview shows the result as you adjust, and you can process several videos at once. Output is H.264 MP4, and AAC / MP3 audio is copied without re-encoding.

## How to use

1. Upload one or more videos
2. Pick a resolution and aspect ratio (or a custom size) and how to fill the frame
3. Click Resize video and download the MP4

## Features

- 1080p / 720p / 480p / 4K presets or custom width × height
- 9:16, 1:1, 4:5, 16:9, 4:3 and 3:4 presets
- Blurred background, color bars, crop to fill or stretch
- Live preview
- Batch processing
- Audio copied without re-encoding

## FAQ

### Which fill mode is best for landscape to portrait?

To keep the whole picture without black bars, use Blurred background — the top and bottom are filled with a blurred, zoomed copy of the video, the look most short-video platforms use. Crop to fill makes the subject fill the screen but cuts off the sides. Solid color bars leave clean space for titles or captions.

### Does upscaling make the video sharper?

No. Scaling 480p up to 1080p only adds pixels, not detail, and makes the file bigger. Upscale only to meet a platform's minimum resolution or to match other footage; to save space choose a lower resolution or the Small size quality.

### Are my files uploaded to a server?

No. Everything runs locally in your browser via WebAssembly. Files never leave your computer and are discarded when you close the page.

### Do I need to sign up or pay?

No. The site is completely free, requires no account, has no usage limits and adds no watermarks.

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- [Convert Video](https://qilingtools.com/en/video/convert): Free online video converter: convert MOV, MKV, AVI, FLV, WebM and more to MP4 or WebM. Powered by FFmpeg, processed locally, no upload.
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- [Extract Audio](https://qilingtools.com/en/video/extract-audio): Free online tool to extract audio from MP4, MOV and other videos as MP3, M4A or WAV. Processed locally, no upload.
- [Video Screenshot](https://qilingtools.com/en/video/screenshot): Free online video frame grabber: enter a timestamp and save that frame as a full-resolution PNG or JPG. Processed locally, no upload.
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- [Merge Videos](https://qilingtools.com/en/video/merge): Free online video joiner: combine several MP4, MOV or MKV clips into one file, even when their resolution and frame rate differ. Processed locally.