Balance quality and file size — Lowering resolution reduces file size significantly while keeping content viewable. Choose the resolution that matches your viewing scenario — smaller screens need fewer pixels.
Local video processing • No upload • Fit modes and scale control
Resize Video
Resize video resolution online. Set custom width and height, choose contain, cover, or stretch, and adjust Scale when you need more or less of the source frame in the output.
What is Video Resolution and Why It Matters
Video resolution defines the width and height of each frame in pixels. Common targets include 4K (3840x2160), 1080p (1920x1080), 720p (1280x720), and 480p (854x480). This tool lets you set custom dimensions, choose how the source frame fits, and adjust Scale in Cover mode. At 100%, the source fills the target canvas; lower values show more of the frame with padding, while higher values crop more tightly.
How to Resize a Video in Your Browser
- 1.Upload the video file you want to resize — MP4, WebM, MOV, or MKV
- 2.Choose a preset resolution (1080p, 720p, 480p) or enter custom width and height
- 3.Select Contain, Cover, or Stretch, then adjust Scale when using Cover
- 4.Start the local resize in your browser — no installation needed
- 5.Download the resized video with your new dimensions
Benefits of Resizing Video Online
Match platform requirements — Different platforms have preferred or required resolutions. YouTube favors 1080p, Instagram Reels needs 1080x1920, and email attachments benefit from 720p or lower.
Control aspect ratio — Resize with specific aspect ratios — 16:9 for widescreen, 9:16 for vertical video, or 1:1 for square — then use Contain, Cover, or Scale to control how much of the source frame remains visible.
Standardize multiple clips — When combining footage from different sources, resizing all clips to the same dimensions ensures a consistent look and avoids editing headaches.
100% private local processing — Your original video stays on your computer the entire time — no upload to any server is needed to change resolution.
Video Resizer FAQ
What does video resolution mean?
Resolution describes the number of pixels in each frame, written as width x height (e.g. 1920x1080). Higher resolution means more detail and sharper images, but also larger file sizes. Common video resolutions are 4K, 1080p, 720p, and 480p.
Which resolution should I choose?
Use 1080p for general-purpose sharing and web publishing, 720p when you need smaller files for email or mobile, 480p for maximum compression, and 4K only when high detail is essential and file size is not a concern.
What is aspect ratio and how does it affect resizing?
Aspect ratio is the proportional relationship between width and height (e.g. 16:9, 9:16, 1:1). When resizing, Contain keeps the full frame with padding when needed, Cover fills the target and may crop the source, and Stretch changes the frame without preserving its proportions.
What does Scale do in Cover mode?
Scale uses 100% as the Cover baseline. Lower values show more of the source frame and can leave padding around it; higher values enlarge the source and crop more of the frame. The available lower limit depends on the source and target aspect ratios.
Does resizing affect video quality?
Reducing resolution removes pixel data, which can make the video appear less sharp on large screens. However, on smaller displays the difference is often imperceptible. Increasing resolution does not add real detail — it interpolates pixels, so quality will not improve beyond the original.
How does resolution affect file size?
Resolution is one of the biggest factors in file size. A 1080p video has 2x the pixels of 720p, so reducing from 1080p to 720p can cut file size by roughly 50% depending on the codec. This is one of the most effective ways to reduce video file size without changing duration.
Can I set custom width and height values?
Yes. In addition to standard presets like 1080p and 720p, you can enter any custom width and height. This is useful for niche platforms or specific delivery requirements that do not match standard resolutions.
Are videos uploaded when changing resolution?
No. Resolution changes are processed locally in your browser. Your original video remains on your computer throughout the process.