Resize Video Online
Change video resolution to 4K, 1080p, 720p, 480p, 360p, or any custom size. Supports MP4, MOV, MKV, AVI, WebM, and more. Free, no signup.
How to Resize a Video
Upload Video
Drag and drop your video file (MP4, MOV, MKV, AVI, WebM, or others) into the tool above, or click to browse. Up to 100 MB.
Choose Resolution
Select a preset (4K, 1080p, 720p, 480p, 360p) or enter custom width and height. Aspect ratio is maintained by default.
Download
Click Resize Video and download your resized MP4. See the new resolution and file size instantly.
Resolution Presets Explained
| Preset | Pixels | File Size Impact | Best For |
|---|---|---|---|
| 4K | 3840×2160 | 4× larger than 1080p | Large displays, TVs, professional editing. Only upscale if you need a specific delivery format — upscaling doesn’t add detail. |
| 1080p | 1920×1080 | Baseline (1×) | Full HD. The universal standard for YouTube, social media, presentations, and general sharing. Recommended default. |
| 720p | 1280×720 | ∼56% smaller than 1080p | HD. Great for email attachments, messaging apps, and mobile viewing. Saves significant space with minimal quality loss on smaller screens. |
| 480p | 854×480 | ∼78% smaller than 1080p | SD. Best for previews, quick shares, slow connections, or when file size is the top priority. |
| 360p | 640×360 | ∼89% smaller than 1080p | Low resolution. Thumbnails, embedded previews, very limited bandwidth scenarios, or mobile data saving. |
When to Resize Videos
- Social media uploads — platforms like Instagram (1080p max), Twitter/X (720p recommended), and TikTok have maximum resolution limits. Uploading a 4K video means the platform will re-encode it anyway — resizing first gives you control over quality.
- Email attachments — most email services cap attachments at 25 MB. Downscaling from 4K to 720p can reduce file size by 75% or more, making it fit within limits.
- Storage optimization — 4K footage from phones and cameras consumes massive storage. If you only need HD quality for archiving, resizing to 1080p reclaims significant disk space.
- Web performance — background videos and embedded clips on websites should be as small as possible. A 720p or 480p version loads faster, saves bandwidth, and looks sharp on most screens.
- Meeting specific requirements — some platforms, LMS systems, or video players require exact dimensions (e.g., 1280×720). Custom resize lets you match those specs precisely.
Aspect Ratio
Aspect ratio is the proportional relationship between a video’s width and height. Common ratios include 16:9 (widescreen), 4:3 (classic TV), 1:1 (square, Instagram), and 9:16 (vertical, TikTok/Reels).
By default, our tool maintains the original aspect ratio when resizing. When you select 1080p for a 16:9 video, you get 1920×1080. For a 4:3 video, you’d get 1440×1080 instead.
Keep aspect ratio (enabled by default for custom sizes) prevents distortion. Changing the width automatically calculates the correct height, and vice versa. If you uncheck it, you can set arbitrary dimensions — but the video may appear stretched or squished if the ratio doesn’t match the source.
If you need to change the aspect ratio (e.g., crop a 16:9 video to 1:1 for Instagram), consider using a video editor with cropping support. Simple resizing without cropping will stretch the image to fit the new ratio.