Free Video Aspect Ratio Converter
Convert any video between 16:9, 9:16, 1:1 and 4:5 — right in your browser. Powered by ffmpeg.wasm, nothing is uploaded.
One video, one ratio. Xeli generates every ratio × every SKU × every platform automatically.
Try XeliDrop a video to convert
MP4 or MOV · under 200MB recommended · runs in your browser
How to use Free Video Aspect Ratio Converter
- 1Upload your video
MP4 or MOV, ideally under 200MB for browser processing.
- 2Choose the target ratio
16:9, 9:16, 1:1, or 4:5 — with center crop or letterbox.
- 3Download
The converted MP4 downloads directly to your machine.
Who this is for
- Performance marketers reformatting UGC for Reels and Shorts
- Agencies adapting one video for Meta, TikTok, and YouTube in one pass
- Ecommerce brands turning landscape product videos into vertical Story/Reel formats
Frequently asked questions
What ratios are supported?
16:9, 9:16, 1:1, 4:5 — the standard ratios for YouTube, TikTok/Reels/Shorts, Meta Feed, and Instagram Portrait.
How does the crop work?
It center-crops and can add letterboxing if you prefer to preserve full content.
What's the max file size?
Because everything runs in your browser, we recommend videos under 200MB for smooth performance.
Xeli produces every aspect ratio, every language, and every platform version of your ad — from a single product feed.
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