B-Roll Creator
Generate master, poster thumbnail, and 360p proxy from your videos. Perfect for building content libraries with fast previews.
Master File
Full quality video resized to your selected aspect ratio. Perfect for final delivery and editing.
Poster Thumbnail
640px wide JPG extracted at 1 second. Ideal for video libraries and preview cards.
360p Proxy
Low-resolution preview for fast loading and scrubbing. Great for editing timelines.
🔒 Privacy First
All processing happens in your browser. Your videos never leave your device. No uploads, no servers, complete privacy.
Generate B-Roll Assets from Any Video — Master, Proxy, and Thumbnail
The B-Roll Creator takes a single video and produces three essential assets in one pass: a full-quality master file resized to your target aspect ratio, a 640px poster thumbnail (JPG), and a 360p proxy video for fast previews. All processing happens in your browser.
This tool is designed for content creators and teams who manage video libraries. Instead of manually extracting frames and re-encoding proxies, drop a video in and get all three outputs instantly.
How It Works
- Upload a video. Any MP4, WebM, or MOV file.
- Select aspect ratio. Choose the target ratio for the master file (9:16, 16:9, 1:1, etc.).
- Generate. Shortify produces the master, poster thumbnail, and 360p proxy in one pass. Download all three.
What You Get
- Master file: Full-quality video resized to your selected aspect ratio, ready for final delivery or editing.
- Poster thumbnail: A 640px-wide JPG extracted at the 1-second mark — ideal for CMS preview cards and video galleries.
- 360p proxy: A low-resolution version for fast scrubbing, timeline editing, and web previews without loading the full file.
Frequently Asked Questions
A proxy is a low-resolution version of your video used for fast previewing, scrubbing, and editing. It loads much faster than the full-quality master file.
The poster thumbnail is extracted at the 1-second mark of the video. It is saved as a 640px-wide JPG.
Yes. You can select from common ratios like 9:16, 16:9, 1:1, and 4:5, or use the original ratio.
No. All processing — master resize, thumbnail extraction, and proxy generation — happens in your browser. Your files stay on your device.
Content creators, video editors, and teams who manage large video libraries and need standardized assets (master, thumbnail, proxy) without manual work.
The master file and proxy are exported as MP4. The poster thumbnail is a JPG image.
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