Video Resizer & Aspect Ratio
16:9 • 9:16 • 1:1 • 4:5
Resize videos for YouTube, Shorts, Reels, TikTok, and square posts with smart crop, letterbox pad, and blurred-background options.
Drop a video to resize or change aspect ratio
Convert horizontal 16:9 clips to 9:16 Shorts/Reels/TikTok, 1:1 Square, or 4:5 Portrait with blurred background or smart crop.
What is Video Resizer & Aspect Ratio?
Video Resizer & Aspect Ratio Changer reformats horizontal or vertical videos for YouTube (16:9), TikTok / Instagram Reels / YouTube Shorts (9:16), Square Feeds (1:1), Instagram Portrait (4:5), and Classic (4:3). Choose between three layout modes: Fit with Blurred Background (turning landscape clips into vertical 9:16 videos with a cinematic blurred backdrop), Crop to Fill, or Solid Color Letterbox Pad.
How to Use Video Resizer & Aspect Ratio
Upload your video
Select a video file from your device or click Load Sample Video.
Pick an aspect ratio preset
Select 9:16 (Shorts/Reels/TikTok), 16:9 (YouTube), 1:1 (Square), 4:5 (Instagram), or 4:3.
Choose Fill Mode
Select Blurred Background, Center Crop to Fill, or Solid Color Pad, and preview the live canvas.
Export resized video
Click Export Resized Video to render and download your reformatted clip.
Key Features
Social media presets: 9:16 Vertical (TikTok/Reels/Shorts), 16:9 Landscape (YouTube), 1:1 Square, and 4:5 Portrait
Three smart layout modes: Cinematic Blurred Background, Center Crop to Fill, and Custom Color Pad
Adjustable background blur intensity and custom padding color picker
Live interactive canvas preview showing exact framing before rendering
100% Client-side rendering with zero watermarks
Tips & Best Practices
- 1
When repurposing a 16:9 YouTube clip for TikTok or Reels (9:16), 'Blurred Background' keeps the entire wide frame visible while filling the top and bottom aesthetically.
- 2
Use 'Crop to Fill' when the speaker stays centered in the frame and you want a full-screen vertical look.
Why Use Our Online Video Resizer & Aspect Ratio?
Video Resizer & Aspect Ratio helps video creators and YouTubers plan, preview, and optimize their video content right from the browser. No heavy software or sign-up required — get instant, creator-ready results.
Frequently Asked Questions
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