How to use
- Drop in or select the video you want to reframe for social media.
- Choose a target aspect ratio: 9:16, 1:1, 4:5 or 16:9.
- Pick a fit mode — Blur pad to keep the whole frame, or Crop to fill it.
- Click Convert and download your MP4 ready for Reels, TikTok or Shorts.
Frequently asked questions
What's the difference between Blur pad and Crop?
Blur pad keeps your entire frame and fills the empty space with blurred bars made from your own video, so nothing is cut off. Crop scales the video up and trims the overflow to fill the frame edge to edge.
Which aspect ratio should I use for Reels and TikTok?
Use Vertical 9:16 (1080x1920) — that's the standard full-screen size for Instagram Reels, TikTok and YouTube Shorts. Square 1:1 (1080x1080) and Portrait 4:5 (1080x1350) work well for feed posts.
What video formats can I convert?
Any common video format your browser can read, such as MP4, MOV or WebM. The output is always a standard MP4 sized for social media.
Are my videos uploaded anywhere?
No. Everything runs locally in your browser with ffmpeg.wasm — your video never leaves your device and nothing is ever sent to a server.
Why is the first conversion slow?
The ~30MB conversion engine (ffmpeg.wasm) downloads the first time you convert. After that it is cached and runs offline, so later conversions start much faster.
Does it keep the sound from my video?
Yes. The original audio track is copied straight through untouched, so your MP4 keeps its sound at full quality.
About this tool
Free video converter for Reels, TikTok and Shorts — reframe any video to 9:16, 1:1, 4:5 or 16:9 with Crop or Blur pad. Runs 100% in your browser, nothing uploaded.