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Resize Video Online
Upload a video and convert it to portrait 9:16, feed 4:5, landscape 16:9, or square 1:1. Choose between smart crop, fit with borders, or fit with blurred background.
Upload a video, pick a target format, and download a video resized for TikTok, YouTube, or Instagram.
- 9:16, 4:5, 16:9, 1:1
- Crop or fit
- Blurred background padding
- Fine-tune in the editor
Start for free.(no credit card required)
How to Resize a Video Online in 3 Simple Steps
1 Upload Your Video
Start by uploading the file you want to resize. You can upload a video directly from your device (MP4, MOV, WEBM) or paste a video URL into our online video resizer.
2 Choose Aspect Ratio and Resize Mode
Select your target format: choose 9:16 for TikTok and Reels, 16:9 for YouTube, or 1:1 for Instagram. Then, pick how you want to resize the video: 'Crop' to fill the frame, 'Fit' to keep the whole video visible with borders, or 'Fit + blur' for an elegant blurred background.
3 Edit and Download
Click generate and your resized video will open in our editor. Unlike a basic video resizer, you can fine-tune the crop position, add text, or auto-generate captions before downloading your perfectly sized video.
01
One Video, Every Platform
Each platform wants a different format: 9:16 for TikTok, Reels and Shorts, 4:5 for social feeds, 16:9 for YouTube, 1:1 for Instagram feed. Upload once, pick your target format, and Revid resizes the video instantly - crop to fill the frame, fit with borders, or fit with an elegant blurred background.
02
Smarter Than a Basic Resizer
Your resized video opens in a full editor where you can reposition the crop, add captions, text or music, and export in high resolution. Need AI-powered reframing that follows the action? Try the auto-reframe option in our caption generator.
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FAQs
Frequently Asked Questions
What is the best way to resize a video online?
Revid AI provides the simplest way to resize a video online directly from your browser. Whether you need to change the video aspect ratio for TikTok, Instagram, or YouTube, our video resizer tool allows you to upload, adjust, and download your perfectly formatted content in seconds without needing complex editing software.
How do I resize a video for TikTok, Reels, or Shorts?
To resize a video for TikTok, Instagram Reels, or YouTube Shorts, you need a vertical format. Upload your file to our tool and select the 'Portrait 9:16' target format. You can choose to smart crop the video to completely fill the vertical screen, or use the 'Fit + blur' option to keep the original horizontal footage fully visible with a stylish blurred background.
Can I change a horizontal video to a vertical video?
Yes! You can easily change a video aspect ratio from landscape (16:9) to portrait (9:16). When you resize a video from horizontal to vertical, we recommend using the 'Fit + blur' resize mode to avoid cutting off important visual elements, or using the 'Crop' mode if the main action is perfectly centered.
What is the difference between Crop, Fit, and Fit + blur?
When you resize a video, 'Crop' zooms in and cuts off the edges to completely fill your new aspect ratio. 'Fit' zooms out to show the entire original video, adding black borders to fill the remaining space. 'Fit + blur' shows the whole video but fills the empty space with a dynamic, blurred version of your footage, which is highly popular for social media videos.
Does it reduce quality to resize a video?
Our online video resizer is engineered to maintain the highest possible quality. When you resize a video, we process and export it in high resolution. Keep in mind that heavy zooming (like taking a small vertical slice from a wide horizontal video using the Crop tool) may naturally make the footage look less sharp, but our engine ensures the best possible output.
How can I resize a video for Instagram?
Instagram supports multiple aspect ratios depending on where you post. To resize a video for the classic Instagram feed, upload your clip and choose the 'Square 1:1' aspect ratio. If you are posting an Instagram Reel or Story, choose the 'Portrait 9:16' option instead.
What video formats can I upload to the video resizer?
You can upload most standard video formats to our online video resizer, including MP4, MOV, WEBM, and QuickTime files. Alternatively, you can simply paste a URL to import a video directly from the web, saving you the hassle of downloading it first.
Can I edit my video after resizing it?
Absolutely! After you resize a video, Revid AI opens your clip in our full editing suite. Once you change the video aspect ratio, you can easily reposition the crop, add auto-generated captions, overlay text, and add background music before exporting your final masterpiece.
Is there an AI auto-reframe feature for moving subjects?
Yes! If you need a smarter crop that tracks a moving subject, you can use the AI-powered auto-reframe option available in our main editor. It automatically follows the action when you resize a horizontal video into a vertical 9:16 format, ensuring your subject stays perfectly centered.
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How it works
From Signal To Published In Four Steps.
1
Find Viral & Trending Videos.
RevidAI's Viral Search and Channel Watcher surface the formats, creators, and trends getting attention right now, then help you turn them into ideas of your own.
- Discover winning video formats in your niche
- Follow creators and channels that matter
- Start with proven ideas instead of guessing
2
Turn An Idea Into A Story.
Found something worth making? Revid AI writes the script, suggests the structure, and turns links, prompts, or topics into complete video concepts.
- Start with a prompt, topic, or URL
- Generate scripts inspired by proven patterns
- Build stories designed to keep people watching
3
Generate The Finished Video.
Script, voiceover, visuals, subtitles, and editing all come together in one workflow. No stitching together five different tools.
- Turn text into complete, multi-minute videos
- Generate everything in one place
- Refine the result in the editor
4
Publish Everywhere.
Share your videos to TikTok, YouTube, Instagram, and wherever your audience is.
- Publish across every major platform
- Reach more people with less work
- Go from idea to published video in minutes
